Qualification: 
M.Tech, B-Tech
r_ramkrishnan@cb.amrita.edu

R. Ramkrishnan currently serves as Assistant Professor at the department of Civil Engineering, Amrita School of Engineering, Coimbatore. He joined Amrita in 2014 after completing M. Tech. from the Faculty of Civil Engineering, SRM University, Chennai, where he worked on sustainable and environmental friendly soil stabilization methods involving microbial precipitation and natural fibre incorporation in soil. His current research focus on Geotechnical Earthquake Engineering, Seismic Hazard Assessment, Slope stability and Beach erosion control. He is also pursuing his Ph. D. from Indian Institute of Science, Bangalore, working on Geotechnical Earthquake Engineering.

Research Interest

  • Geotechnical Earthquake Engineering
  • Seismic Hazard Assessment
  • Geographic Information Systems
  • Land Use Land Cover Dynamics
  • Geosynthetics
  • Slope Stability and Mass Movements
  • Beach Erosion Control
  • Construction Materials
  • Rubberized Concrete

Experience

Year Affliation
June 2015 – Present Assistant Professor
Civil Engineering, Amrita School of Engineering, Coimbatore
June 2014 – June 2015 Faculty Associate
Civil Engineering, Amrita School of Engineering, Coimbatore
July 2012 – August 2012 Site Engineer
Artech Realtors, Trivandrum, Kerala

Technical Skill Asset

  • MATLAB, ANSYS, Origin, LabView, Plaxis 2D, SeismoSoft, QGIS, ArcGIS, R Studio

Projects and Consultancies

Publications

Publication Type: Presentation

Year of Publication Title

2019

Ramkrishnan R. and Pillai, N. N., “Coastal Erosion Control using Pervious Concrete Armor”, The Institution of Engineers, Kerala State Centre, May 1, 2019, Thiruvananthapuram, Kerala. 2019.

2018

Ramkrishnan R., Sreevalsa, K., and Sitharam, T. G., “New Attenuation Relations for North East Himalayas”, 16th Symposium on Earthquake Engineering, IIT Roorkee, India, 20-22 December 2018, Roorkee, Uttarakhand. 2018.

2016

Ramkrishnan R. and Ramachandra, T. V., “Four decades of forest loss: Droughts in Kerala (Poster)”, Lake 2016: Conference on Conservation and Sustainable Management of Ecologically Sensitive Regions in Western Ghats, 10th Biennial Lake Conference: Wetlands for Our Future. Mangalore, Karnataka., 2016.

Publication Type: Journal Article

Year of Publication Title

2019

Ramkrishnan R., S., H., S, V., and Animesh Sharma, “Regression Analysis of Soil Nailing Parameters Using Finite Element and Limit Equilibrium Methods”, Australian Geomechanics Journal, 2019.

2017

Dr. Sreevalsa Kolathayar, G, S. T., and Ramkrishnan R., “Feasibility of Creating a Fresh Water Reservoir in the Arabian Sea Impounding the Flood Waters of Netravathi River”, Journal of Sustainable Urbanization, Planning and Progress, vol. 2, no. 2, pp. 38-42, 2017.[Abstract]


This paper addresses the feasibility of creating a fresh water reservoir in the Arabian sea impounding the flood waters from Netravathi river. The project schemes comprises mainly two steps first the construction of the dyke in the Arabian Sea, and second the process of natural replacement of salty water by rainwater and surface runoff to the reservoir. The study presents the detailed hydrological analysis of Netravati and Gurupura rivers including estimation of runoff into the sea.The study estimates the surface runoff at inlet and outlets of Netravati basin along the costal lines of Arabian Sea. The existing Land use along the costal lines of Netravati basin is assessed. The dyke must be designed to separate fresh water from the salty waters of the Arabian Sea considering the tidal variations and wave heights. The bathymetric profiles of the sea bed has been created and presented in the paper. The annual runoff at the mouth of Netravati River was estimated as 388 TMC and just 2.5% of this would be sufficient to meet the present water shortfall of Bengaluru and Mangaluru. The annual sediment load was found to be negligible. The water quality parameters are well within permissible limits ensuring quality water from Netravathi to the proposed coastal reservoir.

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2017

Ramkrishnan R., Karthik, V., Unnithan, M. S., R. Balaji, K., M. Vinu, A., and Venugopalan, A., “Stabilization of seepage induced soil mass movements using sand drains”, Geotechnical Engineering, SEAGS and AGSSEA, vol. 48, pp. 129-137, 2017.[Abstract]


Rising groundwater levels increases the pore water pressure in the soil slopes, acting as a triggering factor for landslides. By installing sand drains (horizontal or vertical) along the slope, the groundwater level can be lowered below the critical level, reducing the pore water pressure and also the probability of slope failure significantly. In this study, laboratory-scale soil slopes of varying geometry were modelled in a tank and constant inflow was provided to simulate groundwater flow. With and without loading, the critical phreatic levels for the various slopes were determined. Vertical sand drains were then installed along the slope and the tests were repeated for a fixed duration. It was found that the slopes did not fail and remained stable for a longer time period, even with increase of groundwater flow. Hence it was concluded that sand drains are a feasible slope stabilization technique even on slopes subjected to static loading.

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2016

Animesh Sharma and Ramkrishnan R., “Study on Effect of Microbial Induced Calcite Precipitates on Strength of Fine Grained Soils”, Perspectives in Science, vol. 8, pp. 198 - 202, 2016.[Abstract]


Summary For construction purposes, it is very essential to provide a strong foundation for the structure. If required, the suitability of soil has to be improved; this process of improving properties of soil is called Soil Stabilisation. This study intends to experimentally analyse the effectiveness of use of an unorthodox liquid soil stabiliser, Microbial Induced Calcite Precipitates (MICP) for improving the shear strength parameters of two different types of fine grained soils. For this process, a species of Bacillus group, B. pastuerii was used to activate and catalyse the calcite precipitation caused by reaction between urea and calcium chloride. Two types of soils, i.e. intermediate compressible clay and highly compressible clay were used for the study. Parameters included concentration of B. pasteurii, concentration of the cementation reagent and duration of treatment. These parameters were applied on both the soils in a specified range in order to optimise their usage. The results proved that with the use of MICP, there was a noticeable improvement (1.5–2.9 times) in the unconfined compressive strength of both type of soils. It was also found that the strength increased with an increase in duration of treatment. Based on this study, optimum quantity and concentration of liquid additive to be added for different soil types for better strength increments were established.

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2014

Dr. Mini K. M., Alapatt, R. John, David, A. Elizabeth, Radhakrishnan, A., Cyriac, M. Maria, and Ramkrishnan R., “Experimental study on strengthening of R.C beam using glass fibre reinforced composite”, Structural Engineering and Mechanics, vol. 50, pp. 275-286, 2014.[Abstract]


This paper reports the influence of number of layers and length of GFRP sheets wrapped onto RCC beams for strengthening. Twelve beams of size  were cast and tested. Two beams without GFRP and ten beams wrapped in different lay-up patterns with one and two layers of GFRP sheets was subjected to three point loading test and ultrasonic pulse velocity test. Initial crack load, ultimate failure load and types of failure have been observed and noted. Experimental results indicate a significant increase in initial and ultimate load carrying capacity of GFRP wrapped beams compared to unwrapped beams. The failed control specimen was retrofitted using U wrap scheme and tested under three point loading. More »»

Publication Type: Conference Paper

Year of Publication Title

2018

D. Ravichandran, E. Kumar, N., Ramkrishnan R., Viswanathan, K., Sandeep, S., and Manasa, K., “Assessment of Mass Movements and Critical Phreatic Levels in Soil Slopes”, in In Civil Infrastructures Confronting Severe Weathers and Climate Changes Conference (pp. 161-186). Springer, Cham., Cham, 2018.[Abstract]


Tectonic movements and vibrations of the earth cannot be controlled, which causes devastating natural hazards like landslides and earthquakes which have accounted for many lives in the previous years. The major reasons for landslides are heavy rainfall, liquefaction, rise in pore water pressure, floods, etc. This experimental study focuses on identifying the Critical Phreatic Level (CPL) of different soil types for different slope geometries. Different soil types were modeled in a tank of dimensions 2.30 × 1.00 ×\thinspace 1.25 m to simulate the natural field conditions like field density, ground water flow and slope angle in the laboratory with scaled down slopes of specific angles, based on the natural angle of repose of the soil. Density closely resembling the natural field density was obtained by air pluviation and a constant water inflow from an adjacent chamber was provided to simulate groundwater flow. The slope geometry was modeled, initial conditions were set and the phreatic level in the slope was continuously monitored until the slope fails with considerable slope displacement. The soil properties such as permeability, bulk unit weight, specific gravity and angle of repose obtained from laboratory tests were used as input parameters to model the slopes in PLAXIS 2D. The displacement values obtained from the software were compared with the displacement values obtained from the experiment, and were found to be similar, thereby validating the results

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2018

Ramkrishnan R., Sruthy, M. R., Sharma, A., and Karthik, V., “Effect of Random Inclusion of Sisal Fibres on Strength Behavior and Slope Stability of Fine Grained Soils”, in Materials Today: Proceedings, 2018.

2018

Lalith Prakash, S. Kolathayar, and Ramkrishnan R., “Seismic Risk Assessment for Coimbatore considering Ward wise map and Land use”, in GeoShanghai International Conference, Singapore, 2018, pp. 117-124.

2018

Ramkrishnan R., Narayana Pillai, Azhar Aziz, and Gowri R, “Utilization of Geotextile Fabric and Pervious Concrete to prevent coastal erosion in sandy soil beaches of Kerala”, in 5th International GeoChina Conference: Civil Infrastructures Confronting Severe Weathers and Climate Changes, Cham, 2018, pp. 144-160.

2018

Ravichandran D., Ramkrishnan R., Nishok E., Sandeep S. Nair, and Manasa K., “Prediction of Critical Phreatic Level for Slope Stability of Different Types of Soil Using a Scaled Down Laboratory Model”, in 5th International GeoChina Conference: Civil Infrastructures Confronting Severe Weathers and Climate Changes, Cham, 2018, pp. 161-186.

2018

Ramkrishnan R., Karthik V., Animesh Sharma, and Sruthy M. R., “Experimental and Analytical Study on Soil Reinforcement and Slope Stabilization using Natural Jute Fibres”, in 5th International GeoChina Conference: Civil Infrastructures Confronting Severe Weathers and Climate Changes, Cham, 2018, pp. 130-143.

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

Ramkrishnan R., Abilash, B., Trivedi, M., Varsha, P., Varun, P., Vishanth, S., S, B., and S.R., N., “Effect of Mineral Admixtures on Pervious Concrete”, in Materials Today: Proceedings, 2018, vol. 5, pp. 24014-24023.[Abstract]


The major problem encountered with impervious pavements is the drainage of surface runoff which deteriorates the wearing course and causes urban heat island effect. Usage of pervious concrete can reduce this effect. Pervious concrete has applications in parking lots, footpaths and can be used in conjuncture with geo-synthetics to prevent beach erosion. The performance of pervious concrete depends on pore structure, cement matrix, aggregate gradation, cement content, admixtures and water/cement ratio. This study on pervious concrete deals with (i) optimal design for high compressive strength and permeability, (ii) durability tests, and (iii) effect of mineral admixtures on strength and durability

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2018

P. Sugapriya and Ramkrishnan R., “Crumb Rubber Recycling in Enhancing Damping Properties of Concrete”, in IOP Conference Series: Materials Science and Engineering, 2018, vol. 310, p. 012013.[Abstract]


Damping plays a major role in the design of roadside structures that gets affected due to vibrations transmitted from moving traffic. In this study, fine aggregates were partially replaced with crumb rubber in concrete, at varying percentages of 5, 10, 15 and 20% by weight. Three different sets of concrete, mixed with crumb rubber were prepared using raw rubber, treated rubber and treated rubber with partial replacement of cement. Cement was partially replaced with Ultra-Fine Ground Granulated Blast furnace Slag (UFGGBS) for this study. Samples were cast, cured and tested for various properties on the 7th and 28th day. The damping ratio and frequency of the peak value from a number of waves in rubber incorporated beams were found out using a FFT Analyser along with its Strength, Damping and Sorptivity characteristics. SEM analysis was conducted to analyse the micro structural bonding between rubber and concrete. The mode shapes of pavement slabs were modelled and analysed using a FEM tool, ANSYS. From the results, the behaviour of the three sets of rubberized concrete were compared and analysed, and an optimum percentage for crumb rubber and UFGGBS was proposed to achieve best possible damping without compromising the strength properties. © Published under licence by IOP Publishing Ltd.

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2018

P. Sugapriya, Ramkrishnan R., Keerthana, G., and Saravanamurugan, S., “Experimental Investigation on Damping Property of Coarse Aggregate Replaced Rubber Concrete”, in IOP Conference Series: Materials Science and Engineering, 2018, vol. 310, p. 012003.[Abstract]


Rubber has good damping and vibrational characteristics and can reduce cracking significantly due to its elastic nature. This property of rubber can be incorporated in concrete to control vibrations and create better pavements. Crumb Rubber on being dumped in landfills has serious repercussions and causes soil and land pollution. An innovative use of waste tires is shredding them into small pieces and using them as a replacement for coarse aggregate. Crumb rubber is obtained by chopping scrap tires, and in this study it was added in two different sets named SET 1 - Treated Crumb Rubber and concrete, and SET 2 - Treated Crumb rubber with Ultra Fine GGBS as admixture in concrete. Coarse aggregate replaces Rubber in each of the 2 SET's in proportions of 5, 10, 15 and 20%. Properties like Compressive Strength, Young's Modulus, Direct and Semi direct Ultrasonic Pulse Velocity, Sorptivity, Damping ratio and Frequency were found out. Deformation and mode shape were studied with modal analysis and static analysis by applying a uniform pressure corresponding to the highest compressive strength of the slab, using ANSYS. © Published under licence by IOP Publishing Ltd.

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2016

Dr. Maneesha V. Ramesh, Mohan, R., M Kumar, N., Brahmanandan, D., Prakash, C., Lalith, P., M Kumar, A., and Ramkrishnan R., “Micro water distribution networks: A participatory method of sustainable water distribution in rural communities”, in Global Humanitarian Technology Conference (GHTC), 2016, 2016, pp. 797-804.[Abstract]


Water scarcity has been a major thrusting issue in rural India, warrantinga high demand to design and implement different water distribution networks for easy and efficient use of existing water sources. Both macro and micro level systems exist of which, macro level water distribution networks have higher capital and maintenance costs. This is due to its size and the remote beneficiaries to which it caters. This paper describes the design of one such water distribution system in two rural villages in India whose design considerations includes the local community needs, availability of labor, local resources, climate, cost, and time for implementation. This paper also compares the micro and macro water distribution network's impact on sustainability. Sustainability is defined in terms of water wastage, usage rate, source capacity, total network length, cost of deployment, source recharge, and the network leakage rate. The paper discusses the water distribution projectscompletedin a village in Orissa and in a village in Rajasthan (two states in India) where all households were given 24/7 access to clean and safe drinking water for more than a year. The paper also draws insights on the socio-economic impact of the project carried out in these two states.

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PDF iconMicro-water-distribution-networks-A-participatory-method-of-sustainable-water-distribution-in-rural-communities.pdf

Publication Type: Book

Year of Publication Title

2018

Sugapriya P. and Ramkrishnan R., Investigations on Strength and Damping Property of Rubberized Concrete. LAP - Lambert Academic Publishing, 2018.

Publication Type: Patent

Year of Publication Title

2017

Ramkrishnan R. and N. Narayana Pillai, “A system and a method for preventing beach erosion”, U.S. Patent 201741031218.2017.