Qualification: 
Ph.D, M.Tech
s_dhanya@cb.amrita.edu

Dr. Dhanya Sathyan currently serves as Assistant Professor (SG) at the Department of Civil Engineering, School of Engineering, Coimbatore Campus. Her areas of research include Structural Engineering and Concrete Technology. She pursued her M.Tech. in Structural Engineering from NIT Calicut and PhD in the area of cement superplasticizer compatibility from Amrita Vishwa Vidyapeetham.

Awards & Fellowships

  • Qualified in GATE 2003 with All India Rank of 389
  • Reviewer and Editorial board member of reputed Civil Engineering journals
  • Secretary - Indian Concrete Institute (ICI) CoimbatoreCentre

Administrative Responsibilities

  • Academic Co-ordinator of the Civil Engineering Department
  • OBE Co-ordinator of the Civil Engineering Department
  • IQAC Co-ordinator of Civil Engineering Department
  • NBA Co-ordinator of Civil Engineering Department
  • Disciplinary committee member from the Civil Engineering Department
  • BOS member of M.Tech Structural and Construction Engineering and B.Tech Civil Engineering
  • Acting as a class advisor from the inception of B.Tech/M.Tech civil Engineering

Funded Project

Sl.No Title of the project Agency Present status Role (PI/CI)
1 Development of high volume fly ash foam concrete wall Panel using rice straw as thermal insulation material DST Ongoing CI
2 Investigation of compatibility between portland pozzolana cement and admixtures in high performance concrete (DST No:SR/S3/MERC-0041/2011(G) Dated 16/4/2012 DST Completed CI
3 Development of Boron Carbide Concrete for Neutron Shielding (51/14/03/2020-BRNS/36116) BRNS Ongoing CI

Publications

Publication Type: Journal Article

Year of Publication Title

2021

A. Raj, Dhanya Sathyan, Balaji K., and Dr. Mini K. M., “Heat transfer simulation across a building insulated with foam concrete wall cladding”, Materials Today: Proceedings, vol. 42, pp. 1442-1446, 2021.[Abstract]


Foam concrete is a light-weight concrete. It has high flowability, porosity, fire resistance, airborne sound insulation, good heat insulation, and a desirable compressive strength. The goal of this study is to produce thermal insulation foamed concrete cladding using cement, fly ash, and rice straw. Rice straw and fly ash were used to improve the thermal properties of foamed concrete. The present study analyses the thermal and strength properties of foam concrete. Numerical study to investigate the thermal insulation capacity using COMSOL software is also done. The w/s ratio of 0.55, fly ash cement ratio of 1:1 is fixed for all the specimens. The result shows that the mix with 1% rice straw (by weight of cement), 20% foam volume, is found to be optimum in terms of strength, thermal conductivity.

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2021

R. C. Robert, Kuriakose, N. Mani, Gopikrishnan, K., Dhanya Sathyan, and Rajesh, C. B., “Modelling the Rheological Properties of Fly Ash Incorporated Superplasticized Cement Paste at Different Temperature Using Multilayer Perceptrons in Tensorflow”, Proceedings of SECON 2020, 2021.[Abstract]


The rheology deals with flow of matter. It changes with respect to the material composition and test condition. This work investigate the influence of dosage and family of superplasticizer and dosage of mineral admixture and effect of temperature on the rheological properties of cement paste. For this purpose cement pastes were prepared at a water cement ratio of 0.37 using OPC cement, different percentage of fly ash(15, 25, 35) and different dosages of superplasticizer (one from each family). Rheological tests were carried out using co axial cylinder viscometer at three different temperature (15, 27, 35 °C). Rheological parameters like yield stress and plastic viscosities were calculated using Bingham and Herschel bulkley model. Rheological performance were modeled using Multilayer Perceptrons in Tensorflow. Out of 252 data generated, 204 data is used for training the model. The input parameters consists of variables like dosage of cement, fly ash, water, four families of super plasticizers and three different temperatures. The output consists of the measured value of yield stress and plastic viscosity of cement paste. Accuracy of the model is tested using 48 data set. From the predicted data it is clear that the python can be used effectively to predict the rheological properties (yield stress and plastic viscosity) of cement paste.

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2021

A. Raj, Dhanya Sathyan, and Mini, K. M., “Performance evaluation of natural fiber reinforced high volume fly ash foam concrete cladding”, Advances in Concrete Construction, vol. 11, pp. 151-161, 2021.[Abstract]


The major shortcoming of concrete in most of the applications is its high self-weight and thermal conductivity. The emerging trend to overcome these shortcomings is the use of foam-concrete, which is a lightweight concrete consisting of cement, filler, water and a foaming agent. This study aims at the development of a cost-effective high-volume fly-ash foamconcrete insulation wall cladding for existing buildings using natural fiber like rice straw in different proportions. The paper reports the results of systematic studies on various mechanical, acoustic, thermal and durability properties of foam-concrete with and without replacement of cement by fly-ash. Fly-ash replaces 60 percent by weight of cement in foam-concrete. The watersolid ratio of 0.3, the filler ratio of 1:1 by weight, and the density of 1100 kg/m3 (approx.) are fixed for all the mixes. Rice straw at 1%, 3% and 5% by weight of cement was added to improve the thermal and acoustic efficiency. From the investigations, it was inferred that the strength properties were increased with fly-ash replacement up to 1% rice straw addition. In furtherance, addition of rice straw and fly-ash resulted in improved acoustic and thermal properties.

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2020

K. Kiran, Dhanya Sathyan, Dr. Anand K. B., and Devi, P., “Strength and durability properties (effect of salts) of internal curing concrete”, IOP Conference Series: Materials Science and Engineering, vol. 872, p. 012115, 2020.[Abstract]


Concrete is the second most largely consumed material on Earth. The strength and durability parameters of concrete largely depends on the curing process. The quality of concrete to a great extent relies upon the process of curing. It is estimated that 1m3 of concrete requires about 3m3 of water, approximately and a period of 28 days continuous water curing is required to develop the desired properties. In order to restrict the usage of excess amount of water, Internal Curing of Concrete is perhaps the best other option. In this study, internal curing agent – Poly Ethylene Glycol is used at various dosages, 0%, 0.5%, 1.0%, 1.5%, 2%, 2.5%, and 3.0% by cement weight and the mechanical properties are evaluated. The effect of salts on Internal Cured Concrete are evaluated by using two salt solutions viz., NaCl and CaCl2. It was perceived that 2% PEG solution was effective for compressive strength and 1.5% for split tensile and flexural strengths. NaCl and CaCl2 solutions had shown an adverse effect on Internal Cured Concrete.

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2020

D. Jagan, Shankar, V., Mahalingam, T., Dhanya Sathyan, Dr. Mini K. M., and Sahai, G., “Experimental investigation on strength properties of poly - propylene fibre reinforced concrete”, IOP Conference Series: Materials Science and Engineering, vol. 872, p. 012150, 2020.

2020

Dhanya Sathyan, Govind, D., Rajesh, C. B., Gopikrishnan, K., G Kannan, A., and Mahadevan, J., “Modelling the shear flow behaviour of cement paste using machine learning-XGBoost”, Journal of Physics: Conference Series, vol. 1451, 2020.[Abstract]


In recent years machine learning is considered as a highly effective and widely used tool to predict the behaviour of complex and heterogeneous problems. In this paper, the behaviour of superplasticised cement paste is assessed by XGBoost, which is accepted to accomplish the state-of-the-art results on many machine learning challenges. The data required for the development of model is formulated experimentally by conducting rheological tests on cement pastes using a temperature controlled Coaxial Cylinder Viscometer. Various parameters like amount of cement, superplasticiser, water and test temperature are taken as input parameters and the behaviour is assessed by taking rheological characterises like yield stress and plastic viscosity as output parameters. Out of the 252 data formulated experimentally 85 % are used for training and the remaining is for testing the efficacy of the network. From the results it is observed that the model developed using XGBoost is a promising tool for the solution of highly complex and heterogeneous civil engineering problems, which otherwise is highly tedious and time consuming in nature.

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2020

M. Vasumithran, Dr. Anand K. B., and Dhanya Sathyan, “Effects of fillers on the properties of cement grouts”, Construction and Building Materials, vol. 246, p. 118346, 2020.[Abstract]


Cement grout is a mixture utilized for connecting different precast sections, filling voids or sealing joints. The present study reports the suitability of incorporation of fillers such as fine sand and fly ash in cement to develop grouts and evaluation of the flowability and mechanical properties of the prepared grouts. Filler incorporated mixes at low water-cement ratios were not workable. Hence, the workability had to be achieved by addition of chemical admixture, i.e., superplasticizer. In this study, polycarboxylate ether based superplasticizer is added during the mixing process. Different compositions of grouts are prepared for the experimental study. 10% of cement mass is replaced with silica fume in all the grouts whereas up to 50% of cement mass is replaced with fillers in certain mixes and the fresh and hardened state properties are evaluated. Excessive bleeding, grout instability, long setting times and low mechanical strengths are some of the problems associated when the water-cement ratio is increased. Mixes incorporating silica fume only showed poor workability at low water-cement ratios but improved strength compared to other mix types. Grouts incorporating fine sand and fly ash showed poor early age strengths compared to cement grouts containing silica fume only. Also, grouts with fine sand as filler showed improved performance for shrinkage and water absorption over plain cement grouts.

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2020

S. Sharook, Dhanya Sathyan, and Dr. Mini K. M., “Thermo-mechanical and durability properties of expanded perlite aggregate foamed concrete”, Proceedings of the Institution of Civil Engineers - Construction Materials, pp. 1-9, 2020.[Abstract]


The thermal conductivity of a material is a measure of its capacity to conduct heat and is a major factor influencing heat transfer in buildings. For better thermal insulation, construction materials should possess low thermal conductivity. The feasibility of expanded perlite aggregate as a thermal insulation material in foamed concrete was examined. Mechanical, thermo-mechanical and durability properties were assessed and compared. A base mix was designed to have 1100 kg/m3 density, a water-to-solids ratio of 0.3 and a cement-to-sand ratio of 1:1. Expanded perlite aggregate was used as a substitute for fine aggregate in the foamed concrete mix at contents of 0, 10, 20 and 30% by volume. The work was extended by replacing cement with 60% by weight of fly ash to study an eco-friendly mix. The test results showed that the strength values increased with an increase in fly ash and decreased with an increase in perlite. The reverse trend was observed for thermal conductivity and durability, which was also affected by the addition of perlite. The test results showed that expanded perlite is an excellent replacement for sand as a thermal insulation material. The efficiency of the developed material was assessed by an analytical model using the Comsol Multiphysics software program.

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2020

Surya M., Kolathayar, S., Valli, s, and Dhanya Sathyan, “Pseudostatic analysis of soil nailed vertical wall for composite failure”, Geomechanics and Geoengineering, 2020.[Abstract]


In the present study, pseudostatic method is used to analyse the stability of soil-nailed vertical wall under seismic conditions. This approach includes an additional inertial force equivalent to the dynamic load caused by earthquake. The soil surface which undergoes failure due to the static and dynamic condition is assumed to be a realistic composite failure surface rather than the conventional planar, circular or log-spiral surfaces. This study investigates the effect of various parameters such as vertical and horizontal seismic acceleration coefficients, friction angle of soil, shear wave velocity, primary wave velocity, amplification factor, nail length, spacing of the nails, and nail inclination on the stability of the vertical soil-nailed wall. A comparison study is made between the results obtained from the present analysis and the values reported in the literature. It is observed the present study with composite failure surface gives higher values of Factor of Safety compared to planar failure surface. Composite failure surface is more realistic and hence more accurate compared to a planar failure surface which gives a conservative value of Factor of Safety.

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2020

R. R. Lakshan, Rosini, A. M., Sathiyan, K., Dhanya Sathyan, Dr. Mini K. M., and Dr. Gangadharan D., “Comparison of different dosages of PCM incorporated wallpanels”, IOP Conference Series: Materials Science and Engineering, vol. 872, p. 012119, 2020.[Abstract]


In the modern world of development and technology, sustainable development is of greater need. One of the main factors that cause global warming is due to the usage of the artificial air conditioner in buildings. This study is the development of an eco-friendly wall panel for buildings which can reduce the usage of artificial air conditioner and to improve the thermal comfort in buildings in a sustainable way. To achieve this, PCM materials is used in mortar wall panels to regulate the temperature. PCM absorbs heat at higher temperature and releases the absorbed heat at lower temperature. In this study PCM were encapsulated to prevent them from being affected by the chemical environment. The encapsulated PCM were incorporated in mortar cubes and were made into wall panels. The PCM incorporated specimens were tested for compressive strength and thermal conductivity to study the hardened property and the heat transfer. The obtained results were compared with the control specimen to conclude the effect of PCM in mortar wall panels. The PCM incorporated specimens showed improved results compared to the control specimen.

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2020

B. raj, Dhanya Sathyan, and Dr. Mini K. M., “Mechanical and Durability Properties of Hybrid Fiber Reinforced Foam Concrete”, Construction and Building materials, CONBUILDMAT-D-19-03919 , 2020.

2019

G. Kottukappalli Febin, A. J. Abhirami, A. Vineetha, V. Manisha, Ramkrishnan R., Dhanya Sathyan, and Dr. Mini K. M., “Strength and durability properties of quarry dust powder incorporated concrete blocks”, Construction and Building Materials, vol. 228, 2019.[Abstract]


Quarry dust powder is the waste generated from Manufactured Sand (M Sand) units and constitutes to 30–40% of the total quarry dust produced. When dry, it turns into fine dust that causes severe health issues to people and also causes serious threats to environment by polluting soil and water. Transportation and proper disposal of this waste is a tedious task because of its adhesive nature and high water absorption character. The present study reports the suitability of quarry dust powder in the development of concrete building blocks by evaluating its strength, durability, acoustic and thermal properties. Since the mixes showed very dry nature at higher percentages of M Sand replacement, workability was kept in a constant range to find the optimum mix. M Sand was replaced with quarry dust powder in the test specimens at varying percentages of 0, 15, 30, 45 and 60 and tests were conducted to study these properties after finalizing the optimum mix. On comparing the results, it was found that compressive and split tensile strength increased and impact strength decreased on replacing M Sand with quarry dust powder. Abrasion resistance, acoustic absorption and sorptivity properties were found to improve at 30% replacement whereas thermal conductivity was found to increase with increasing percentages of M Sand replacement. The results of the study have thus proved the effective use of quarry dust powder in developing concrete building blocks in an economic, effective and sustainable way.

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2019

A. Raj, Dhanya Sathyan, and Dr. Mini K. M., “Physical and Functional Characteristics of Foam Concrete: A Review”, Construction and Building materials , 2019.

2019

A. N. R, Dhanya Sathyan, and Dr. Mini K. M., “Rice Husk Incorporated Foam Concrete Wall Panels as a Thermal Insulating Material in Building”, Indoor and built environment, 2019.

2019

Dhanya Sathyan and Dr. Anand K. B., “Influence of Superplasticizer Family on the Durability Characteristics of Fly Ash Incorporated Cement Concrete”, Construction and Building Materials, vol. 204, pp. 864-874, 2019.[Abstract]


Nowadays, researchers are focusing on developing more durable cementitious matrices. Major durability problems are associated with sulphate attack, acid attack, chloride penetration etc. The important method to improve the durability characteristics of concrete is to reduce the permeability of concrete by giving good compaction. Superplasticizer addition is one of the methods to improve the workability and thereby reducing the porosity. A large amount of CO 2 is emitted into the atmosphere from the cement plants during the calcination of CaCO 3 and also through the burning of fuel in the kiln. The environmental pollution can be reduced by replacing the cement with the pozzolanic materials like fly ash. Portland pozzolana cement (PPC) is nowadays considered as a sustainable substitute of ordinary portland cement (OPC). The combined influence of pozzolanic and superplasticizer from four different families on the durability properties of concrete and mortar is studied is in this work by conducting laboratory tests like the sorptivity test, acid resistance test, RCPT test and sulphate resistance tests. In this study sorptivity value of the superplasticized mixes are found to be less than that of control specimen without superplasticizer. In all durability related aspects, the mixes with PCE based superplasticizer showed better performance than the control mix and that of mixes with other families of superplasticizer. Improvement in durability characteristics is observed for the mixes containing commercially available PPC compared to the mixes prepared with site blended PPC (ie OPC + 25% FA).

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2018

Suganya M, Dr. Mini K. M., and Dhanya Sathyan, “Performance of Concrete Made Using Waste Fiber Reinforced Polymer (Frp) Powder as A Partial Replacement for Fine Aggregate”, Material today proceeding, vol. 5, no. 11, pp. 24114-24123, 2018.

2018

F. G. Kottukappalli, Ramkrishnan, R., Mini, K. M., and Dhanya Sathyan, “Strength properties of concrete blocks with quarry sludge as partial replacement to fine aggregate”, Material today proceeding, 2018.

2018

N. Manomi, Dhanya Sathyan, and Dr. Anand K. B., “Coupled effect of superplasticizer dosage and fly ash content on strength and durability of concrete”, Materials Today: Proceedings, vol. 5, pp. 24033 - 24042, 2018.[Abstract]


The incorporation of fly ash in concrete enhanced the durability of portland cement concrete more effectively. Fly ash is incorporated as a mineral admixture because of its advantageous properties like pozzolanic reaction and pore refinement. At the point when fly ash is added in concrete, calcium hydroxide, liberated during cement hydration, reacts with the reactive silica present in fly ash and forms calcium silicate hydrate(C-S-H) gel. This research investigates the influence of fly ash in conjunction with four different superplasticizers (SP) namely Polycarboxylate ether (PCE), Lignosulphonate (LS), Sulphonated Melamine Formaldehyde (SMF) and Sulphonated Naphthalene Formaldehyde (SNF) and on the mechanical and durability properties of concrete. Concrete was made with different levels of class F flyash replacement (0,15, 25, and 35% by mass) of cement, the w/c ratio were maintained constant as 0.37 and the superplasticizer dosage corresponding to saturation dosage. The saturation dosage of superplasticizer is measured by conducting marsh cone and minislump tests. The mechanical and durability properties tested were compressive strength, splitting tensile strength and Sorptivity. PCE based superplasticizers are found to be more effective. Modification in the mechanical by increase in later age strength and durability properties by increase of the concrete was observed with the addition of fly ash and superplasticizer in control mix

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2018

Dhanya Sathyan, K. B. Anand, and Sindu Menon M, “Rheological parameter study of superplasticized portland pozzolana cement paste at different temperatures and Modeling using random kitchen sink algorithm”, Journal of materials in civil engineering, 2018.

2018

R. C Robert, Dhanya Sathyan, and Dr. Anand K. B., “Effect of superplasticizers on the rheological properties of fly ash incorporated cement paste”, Materials Today: Proceedings, vol. 5, pp. 23955-23963, 2018.[Abstract]


The rheology is a study of flow of matter. Rheological behavior of cement paste changes with composition of cement, amount of mineral and chemical admixtures, family of superplasticizer, temperature etc. This paper explores the influence of superplasticizer dosage, superplasticizer family and mineral admixture dosage on the rheological behavior of cement paste. For this purpose cement pastes were prepared at a water cement ratio of 0.37 using OPC and different percentage of fly ash (15, 25, 35) and different dosages of superplasticizer (one from each family). Four families of superplasticizer used for this study are polycarboxylate ether, sulphonate melamine formaldehyde, sulphonate naphthalene formaldehyde and lignosulphates. Rheological tests were performed in a coaxial cylinder viscometer (Brookfield DV-II). Saturation dosage of the superplasticizers in the cement paste mixes with different percentage of fly ash replacement were obtained through marsh cone and mini slump tests on cement paste. Cement pastes were placed in the sample chamber of coaxial cylinder viscometer and shear stress produced measured with known shear rate ranging from 30 S to 65 S-1 applied to the fluid through the spindle. Rheological parameters like yield stress and plastic viscosities were calculated using Bingham and Herschel bulkley model. Change in rheological parameters of the cement paste with fly ash replacement percentage, superplasticizers dosage and family were measured and comparison is made

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2018

S. Aparna, Dhanya Sathyan, and Dr. Anand K. B., “Microstructural and rate of water absorption study on fly-ash incorporated cement mortar”, Materials Today: Proceedings, vol. 5, pp. 23692-23701, 2018.[Abstract]


Today durability is the most concerning factor in the construction field. Durability and strength are mainly controlled by microstructure of the concrete. Dense microstructure with less interconnected pores results in good strength and durable concrete. A dense microstructure can be obtained by providing good compaction, curing and by the use of mineral admixtures. This paper deals with the study on the effect of fly ash addition and superplasticizer dosage and its family in improving the strength, microstructure and durability of mortar. For this purpose mortar is prepared at a water to cement ratio of 0.37 with ordinary portland cement, class F fly ash at different percentage replacement to cement such as 0%, 15%, 25%, and 35% and superplasticizer. The superplasticzer from four different family such as Polycarboxylate ether (PCE), Lignosulphonate (LS), Sulphonated Naphthalene Formaldehyde (SNF) and Sulphonated Melamine Formaldehyde (SMF) is also used in this study. Durability of the mortar is determined by checking the 28th day rate of water absorption in mortar specimen and also by checking the size and connectivity of the pores by means of microscopic study in hardened concrete. There is decrease in 28th day compressive strength for mortar specimen with all levels of fly-ash replacement was observed in this study. Improvement in the compressive strength of the mortar compared to control specimen were observed with the addition of superplasticizer in all levels of addition of fly-ash. A good correlation between the pore size and compressive strength were also observed in this study. © 2018 Elsevier Ltd.

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2018

Dhanya Sathyan, Dr. Anand K. B., and Sindu Menon M, “Temperature Influence on Rheology of Superplasticized Pozzolana Cement and Modeling using RKS Algorithm”, Journal of Materials in Civil Engineering, vol. 30, 2018.[Abstract]


Rheology deals with flow and deformation of matter under applied force. The study of rheological response of superplasticized portland pozzolana cement pastes subjected to a stepwise loading at three levels of temperature using Herschel-Bulkley and Bingham flow models is presented here. Rheological tests were done in a temperature-controlled coaxial cylinder viscometer (Brookfield DV-II). Cement pastes were prepared at a water-cement ratio of 0.37 using four types of portland pozzolana cement (PPC) and superplasticizers (SP) of four different families. Saturation dosages of the superplasticizers were obtained through Marsh cone and mini slump tests. Rheological tests were done on superplasticized cement paste mixes for three levels of dosages viz., lower than the saturation dosage, saturation dosage, and higher than the saturation dosage. Cement paste samples were subjected to shear rates ranging from 30 to 65 S-1 in the viscometer and the resultant shear stress was measured. Rheological parameters were obtained at three test temperatures (15, 27, and 35°C) by fitting the second cycle downward flow curves using Bingham model and Herschel-Bulkley model. These parameters were analyzed and used for modeling through random kitchen sink algorithm. The variation of predicted and measured values of the rheological parameters were compared and validated. It was observed that the model could effectively predict the rheological parameters within the experimental domain. © 2018 American Society of Civil Engineers.

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2018

M. Ananthkumar, Dhanya Sathyan, and Prabha, B., “Study on Effectiveness of Processed and Unprocessed Black Liquor Pulps in Improving the Properties of PPC Mortar, Concrete and SCC”, IOP Conference Series: Materials Science and Engineering, vol. 310, 2018.[Abstract]


The cost of construction materials is increasing day by day because of high demand, scarcity of raw materials and high price of energy. From the view point of energy saving and over consumption of resources, the use of alternative constituents in construction materials is now a global concern. From this, the extensive research and development works towards exploring new ingredients are required for producing sustainable and environment friendly construction materials. Bagasse pulp liquor is one such material that can be used as a chemical admixture which is obtained as a by-product of paper manufacturing process. Around 5 million tons of bagasse pulp is obtained throughout the world each year. since the material is a waste product from paper industry, this can be changed as a admixture by its effective use in concrete. In the present investigation black pulp liquor is added to fresh concrete in different dosages, the concrete is then tested for workability, compressive strength, flexural, split tensile strength and setting time. From results it is shown that 1% replacement of water with black pulp liquor increases the fresh properties of the concrete, 2% replacement of water with black pulp liquor increases the mechanical properties of the concrete and acts as a set retarder. © Published under licence by IOP Publishing Ltd.

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2018

A. J. Prakash, Dhanya Sathyan, Dr. Anand K. B., and Aravind, N. R., “Comparison of ANN and RKS Approaches to Model SCC Strength”, IOP Conference Series: Materials Science and Engineering, vol. 310, p. 012037, 2018.[Abstract]


Self compacting concrete (SCC) is a high performance concrete that has high flowability and can be used in heavily reinforced concrete members with minimal compaction segregation and bleeding. The mix proportioning of SCC is highly complex and large number of trials are required to get the mix with the desired properties resulting in the wastage of materials and time. The research on SCC has been highly empirical and no theoretical relationships have been developed between the mixture proportioning and engineering properties of SCC. In this work effectiveness of artificial neural network (ANN) and random kitchen sink algorithm(RKS) with regularized least square algorithm(RLS) in predicting the split tensile strength of the SCC is analysed. Random kitchen sink algorithm is used for mapping data to higher dimension and classification of this data is done using Regularized least square algorithm. The training and testing data for the algorithm was obtained experimentally using standard test procedures and materials available. Total of 40 trials were done which were used as the training and testing data. Trials were performed by varying the amount of fine aggregate, coarse aggregate, dosage and type of super plasticizer and water. Prediction accuracy of the ANN and RKS model is checked by comparing the RMSE value of both ANN and RKS. Analysis shows that eventhough the RKS model is good for large data set, its prediction accuracy is as good as conventional prediction method like ANN so the split tensile strength model developed by RKS can be used in industries for the proportioning of SCC with tailor made property.

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2018

Dhanya Sathyan, Dr. Anand K. B., Jose, C., and Aravind, N. R., “Modelling the Minislump Spread of Superplasticized PPC Paste using RLS with the Application of Random Kitchen Sink”, IOP Conference Series: Materials Science and Engineering, vol. 310, 2018.[Abstract]


Super plasticizers(SPs) are added to the concrete to improve its workability with out changing the water cement ratio. Property of fresh concrete is mainly governed by the cement paste which depends on the dispersion of cement particle. Cement dispersive properties of the SP depends up on its dosage and the family. Mini slump spread diameter with different dosages and families of SP is taken as the measure of workability characteristic of cement paste chosen for measuring the rheological properties of cement paste. The main purpose of this study includes measure the dispersive ability of different families of SP by conducting minislump test and model the minislump spread diameter of the super plasticized Portland Pozzolona Cement (PPC)paste using regularized least square (RLS) approach along with the application of Random kitchen sink (RKS) algorithm. For preparing test and training data for the model 287 different mixes were prepared in the laboratory at a water cement ratio of 0.37 using four locally available brand of Portland Pozzolona cement (PPC) and SP belonging to four different families. Water content, cement weight and amount of SP (by considering it as seven separate input based on their family and brand) were the input parameters and mini slump spread diameter was the output parameter for the model. The variation of predicted and measured values of spread diameters were compared and validated. From this study it was observed that, the model could effectively predict the minislump spread of cement paste. © Published under licence by IOP Publishing Ltd.

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2018

Dhanya Sathyan, Dr. Anand K. B., Dr. Mini K. M., and Aparna, S., “Optimization of Superplasticizer in Portland Pozzolana Cement Mortar and Concrete”, IOP Conference Series: Materials Science and Engineering, vol. 310, p. 012036, 2018.[Abstract]


Chemical Admixtures are added to concrete at the time of mixing of its constituents to impart workability. The requirement of right workability is the essence of good concrete. It has been found that the use of optimum use of admixtures is very important since low dosage may result in loss of fluidity and over dosage could lead to segregation, bleeding, excessive air entrainment etc in concrete. Hence it is essential to find optimum dosage of superplasticizer for getting good strength and workability. But large number of trial tests are required in the field to find the saturation dosage of superplasticizer in concrete which requires more materials and consume more time. The paper deals with developing a co-relation between the quantity requirements of superplasticiser in mortar to that of cement concrete to get good workability. In this work for preparing mortar and concrete 4 brands of locally available Portland pozzolana cement (PPC) and superplasticizer (SP) belonging to 4 different families namely Polycarboxylate Ether (PCE), Lignosulphate (LS), Sulfonated Naphthalene Formaldehyde (SNF) and Sulfonated Melamine Formaldehyde (SMF) are used. Two different brands of SP's are taken from each family. Workability study on the superplasticized mortar with cement to sand ratio 1:1.5 and water cement ratio of 0.4 was performed using marsh cone and flow table test and workability study on the concrete with same cement/sand ratio and water cement ratio was done using slump cone and flow table test. Saturation dosage of superplasticizer in mortar and concrete determined experimentally was compared to study the correlation between two. Compressive strength study on concrete cubes were done on concrete mixes with a superplasticizer dosage corresponding to the saturation dosage and a comparative study were done to analyse the improvement in the compressive strength with addition of superplasticizer from different family.

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2018

Aravind J. Prakash, Dhanya Sathyan, Dr. Anand K. B., and B. Premjith, “Modeling the Fresh and Hardened Stage Properties of Self-Compacting Concrete using Random Kitchen Sink Algorithm”, International Journal of Concrete Structures and Materials, vol. 12, 2018.[Abstract]


High performance concrete especially self compacting concrete (SCC) has got wide popularity in construction industry because of its ability to flow through congested reinforcement without segregation and bleeding. Even though European Federation of National Associations Representing for Concrete (EFNARC) guidelines are available for the mix design of SCC, large number of trials are required for obtaining an SCC mix with the desired engineering properties. The material and time requirement is more to conduct such large number of trials. The main objective of the study presented in this paper is to demonstrate use of regularized least square algorithm (RLS) along with random kitchen sink algorithm (RKS) to effectively predict the fresh and hardened stage properties of SCC. The database for testing and training the algorithm was prepared by conducting tests on 40 SCC mixes. Parametric variation in the SCC mixes were the quantities of fine and coarse aggregates, superplasticizer dosage, its family and water content. Out of 40 test results, 32 results were used for training and 8 set results were used for testing the algorithm. Modelling of both fresh state properties viz., flowing ability (Slump Flow), passing ability (J Ring), segregation resistance (V funnel at 5 min) as well as hardened stage property (compressive strength) of the SCC mix was carried out using RLS and RKS algorithm. Accuracy of the model was checked by comparing the predicted and measured values. The model could accurately predict the properties of the SCC within the experimental domain. © 2018, The Author(s).

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2017

Sindu Menon M, Dhanya Sathyan, and Dr. Anand K. B., “Studies on Rheological Properties of Superplasticised PPC Paste”, International Journal of civil engineering and Technology, vol. 8, no. 10, pp. 939-947, 2017.[Abstract]


Rheology is the science which deals with flow and deformation of matter under applied force. The study of rheological response of superplasticised PPC pastes subjected to a stepwise loading at a constant temperature using different flow models is presented here. Rheological tests are done in temperature controlled Coaxial Cylinder Viscometer (Brookfield DV-II) to determine the parameters which in turn describe the flow behaviour. Mix prepared at water-binder ratio of 0.37 using two brands Portland Pozzolana Cement (PPC) and Superplasticisers (SP) of four different families namely Polycarboxylate Ether, Sulphonated Melamine Formaldehyde, Sulphonated Naphthalene Formaldehyde and Lignosulphates were used for the study. The tests were done on 5 mixes in each superplasticiser, one on the optimum dosage obtained and the remaining were on the dosage values lower and higher than the optimum dosage. Optimum dosage of the superplasticiser was obtained from the empirical tests like mini slump test and marsh cone tests. Cement pastes were placed in the sample chamber of coaxial cylinder viscometer and shear stress produced when a known shear rate applied to the fluid through spindle is measured at a constant temperature of 27°C. Two loading and unloading cycles were imposed by increasing, and later decreasing the shear rate. The response of downward curve of the second cycle is used for determining the rheological parameters. Rheological parameters obtained at constant test temperature by fitting the second cycle downward flow curves using Bingham model and Herschel Bulkley model are compared.

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2017

Aravind J. Prakash, Dhanya Sathyan, K. B. Anand, and B. Premjith, “Prediction of rheological properties of self compacting concrete: Regularized least square approach”, International Journal of Earth Sciences and Engineering, 2017.

2016

S. Menon.M, Dhanya Sathyan, and Dr. Anand K. B., “Rheological properties of superplasticized portland pozzolana cement paste”, ESTIS 2016, 2016.

2016

C. Jose, Dhanya Sathyan, and Dr. Anand K. B., “Modelling Marsh cone flow time of superplasticized PPC paste –using RLS with the application of RKS”, ESTIS 2016, 2016.

2016

K. Praveen, Dhanya Sathyan, and Dr. Mini K. M., “Study on performance of concrete with over-burnt bricks aggregates and micro-silica admixture”, IOP Conference Series: Materials Science and Engineering, vol. 149, p. 012061, 2016.[Abstract]


Concrete is made by mixing cement, sand, aggregates and water in required proportion, where aggregates occupy the major volume. Addition of aggregates in concrete improves properties of concrete. With the natural resources depleting rapidly, limiting the use of natural resources and enhancing the use of waste materials is very important for sustainable development. Over-burnt bricks are a waste material which cannot be used in construction directly because of their irregular shape and dark colour. Use of over-burnt bricks helps to preserve natural aggregate source. The present study focuses on the effects of microsilica at various percentages as a partial cement replacement in concrete with over-burnt bricks as coarse aggregates. The mechanical properties of hardened concrete such as splitting tensile strength, flexural strength and compressive strength are studied and analyzed. More »»

2016

Dhanya Sathyan, Dr. Anand K. B., and Dr. Mini K. M., “Experimental Study on Portland Pozzolana Cement-Superplasticiser Compatibility in Mortar”, International Journal of Earth Sciences and Engineering, vol. 09, no. 02, pp. 539-544, 2016.

Publication Type: Book Chapter

Year of Publication Title

2021

Dr. Mini K. M., Dhanya Sathyan, and Dr. Jayanarayanan K., “Chapter Three - Hybrid natural fiber composites in civil engineering applications”, in Hybrid Natural Fiber Composites, A. Khan, Rangappa, S. Mavinkere, Siengchin, S., Jawaid, M., and Asiri, A. M., Eds. Woodhead Publishing, 2021, pp. 41-72.[Abstract]


This chapter is aimed to cover the recent developments in hybrid natural fiber composites used in civil engineering and construction. The replacement of synthetic fibers with natural fibers has been one of the most sought after research areas in the recent past. The attributes like the economy, low density with high specific strength and stiffness, biodegradability, renewability, and environment-friendly nature have made natural fibers a viable choice in the civil engineering sector. The application of natural fibers along with synthetic fibers in retrofitting of existing structures, strengthening of concrete and soil are reviewed in this article. The effect of fiber treatment and laying pattern, on the mechanical properties, durability, and weatherability of hybrid natural fiber composites are discussed in detail. The development of novel wood flour filled microfibrillar composites from waste plastics for building materials is also presented.

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Publication Type: Conference Paper

Year of Publication Title

2018

F. G. Kottukappalli, Ramkrishnan R., Dhanya Sathyan, Mini, K. M., S., B., and S.R., N., “Strength Properties of Concrete Blocks with Sand Manufacture Sludge as Partial Replacement to Fine Aggregate”, in Materials Today: Proceedings, 2018, vol. 5, pp. 23733-23742.[Abstract]


The proper disposal of Sand Manufacture Sludge(SMS) from the site is a major problem faced by most of the stone crushing units. SMS when dried is in the form of a fine powder. Due to its sticky nature and time taken to dry, transporting this material is very tedious. Hence it necessitates for finding a solution for the usage at the site itself, in the form of a construction material. This study focuses on replacing M Sand with SMS for the development of concrete building blocks. The study evaluates the effectiveness of use of this waste SMS in manufacturing concrete building blocks and estimating its strength properties, keeping a constant workability throughout. The strength, impact and abrasion properties of the concrete blocks are studied and compared with the conventional blocks and shows good agreement.

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2018

M. Suganya, Dhanya Sathyan, and Mini, K. M., “Performance of Concrete Using Waste Fiber Reinforced Polymer Powder as a Partial Replacement for Fine Aggregate”, in Materials Today: Proceedings, 2018, vol. 5, pp. 24114-24123.[Abstract]


Proper disposal of fiber waste products is a major problem faced by the FRP industries and hence needs a sustainable solution for its reuse and recycling. The present paper deals with the performance of concrete using waste fiber reinforced polymer powder (FRP), as a partial replacement for fine aggregate in the concrete. Field emission scanning electron microscopy (FESEM) analysis along with energy dispersive X-Ray (EDX) is carried out to find out the elements present in the FRP powder used in the present study. Partial replacement of 5%, 10% and 15% are carried out in the fine aggregate content of control mixture of M30 grade. The workability, compressive strength, split tensile strength, flexural strength, impact and abrasion resistance are measured to observe the effect of waste FRP powder on the concrete. From the study it is observed that workability decreased with increase in percentage of FRP substitution with a considerable increase in strength properties for 10% replacement of fine aggregate content by waste fiber reinforced polymer powder. Also better performance is observed for impact and abrasion resistance. © 2018 Elsevier Ltd.

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2016

Praveen, Dhanya Sathyan, and Mini, K. M., “Study on performance of concrete with over-burnt bricks aggregates and micro-silica admixture”, in Proceedings of International conference on Emerging and Sustainable Technologies for infra structure systems, 2016.

2016

C. Jose and Dhanya Sathyan, “Modelling marsh cone flow time of Super Plasticized Portland Pozzolana Cement paste using RLS with the application of RKS”, in Proceedings of International conference on Emerging and Sustainable Technologies for infra structure systems , 2016.

2016

and Dhanya Sathyan, “Prediction of passing ability of SCC: Regularized least squares approach”, in Proceedings of International conference on Emerging and Sustainable Technologies for infra structure systems , 2016.

2016

S. M and Dhanya Sathyan, “Rheological properties of superplasticized portland pozzolana cement paste”, in Proceedings of International conference on Emerging and Sustainable Technologies for infra structure systems , Coimbatore, 2016.

2016

A. .J.Prakash, Dhanya Sathyan, Dr. Anand K. B., and .B, P., “Prediction of passing ability of self compacting concrete: Regularized least square approach”, in International conference on Emerging and Sustainable Technologies for Infrastructure System, Coimbatore, 2016.

2014

Dhanya Sathyan, Yashna Chandran, Akshara Asok, Abhay H, Vikram S, Suraj Shinde, and Akshaya, “Study on the effect of superplasticisers on workability of portland pozzolana cement mortar”, in International Conference on Innovations and Advances in Civil Engineering Towards Green and Sustainable Systems, Coimbatore, 2014.

Publication Type: Conference Proceedings

Year of Publication Title

2014

Dhanya Sathyan, Yashna Chandran, Akshara Asok, Abhay H, Vikram S, Suraj Shinde, and Akshaya, “Study on the effect of superplasticisers on workability of portland pozzolana cement mortar”, Int. Conference on Innovations and Advances in Civil Engineering Towards Green and Sustainable Systems, April 2014, at CIT Coimbatore, 28-30 April, 2014. 2014.

Innovation in Teaching and Learning

  • 15CVL442: Concrete Technology
    To get more insight into the properties and nature of concrete, a hands on training session was arranged with the support of L&T Engineers Er L S Kannan(JGM &Head concrete management department) and Er.Umamaheswaran V. This gives a different experience to the students about the theory and practical implementation in the field.
    Student got an opportunity to apply their class room learning to field. This improved their ability to prepare concrete with required property with less number of trial.