Dr. Siventhirarajah Krishnya

Senior Lecturer Grade II
Department of Civil Engineering

B.Sc. Eng (Peradeniya), M.Sc. (Peradeniya), Ph.D. (Hokkaido, Japan)

Research interests : Analyzing the mechanical and durability characteristics of cement-based materials

  krishnya@eng.jfn.ac.lk    +94-21-206-0160

Dr. Krishnya is currently working as a senior lecturer affiliated to Department of Civil Engineering, Faculty of Engineering, University of Jaffna since August 2023. She obtained her B.Sc. (Eng) and M.Sc. degree from the University of Peradeniya in 2015 and 2018 respectively. She worked as a design engineer at Yunica Design Engineers & Consultants (pvt) Ltd, Colombo, Sri Lanaka from September 2016 to March 2019 prior to her doctorate studies. She received her Ph.D. degree from Hokkaido University in the Year of 2022. Her PhD thesis was on the topic, “Multi-Stage Model for Predicting the Mechanical and Durability Characteristics of Cement-Based Material”, where she developed a novel simulator to predict the mechanical and durability properties from the microstructure of the hydrated matrix. She worked as post-doctoral research fellow at the Division of Sustainable Resources Engineering, Hokkaido University from April 2022 to September 2022. She has research experience in the field of civil engineering with particular emphasis on cement and concrete technology and supplementary cementitious materials. She has published many technical papers (Journals, Conference papers) in the field of Material Engineering. She is an Associate Member of the Institution of Engineers Sri Lanka (IESL).

  • Prediction of mechanical properties of concrete.
  • Model development for carbonation in concrete
  • Simulation of the transport of ions and gases in the concrete matrix.
  • Mechanical and durability properties analyzation and model development for supplementary cementitious materials
  • She was awarded Mahapola scholarship during her undergraduate study.
  • M. Amaratunga Award by University of Peradeniya for the best performance in Strength of Materials in 2016.
  • Hokkaido University Special Grant for International Ph.D. Students by the President of Hokkaido University, Japan in 2019.
  • Ohtsuka Memorial by Hokkaido University, Japan for the outstanding academic achievement in Ph.D in 2022
  • Best Presentation Award for the paper presented at Japan Concrete Institute (JCI) Annual Convention, Chiba, Japan in 2022.
International Journals
6 results
[6]Modeling of hydration products and strength development for high-volume fly ash binders (), In Construction and Building Materials, volume 320, .
[5]Investigating the hydration characteristics of a new composite cementitious binder containing of slag and calcite (), In Construction and Building Materials, volume 361, .
[4]A two-stage model for the prediction of mechanical properties of cement paste ( and ), In Cement and Concrete Composites, volume 115, .
[3]Hydration of ferrite-rich Portland cement: Evaluation of Fe-hydrates and Fe uptake in calcium-silicate-hydrates ( and ), In Construction and Building Materials, volume 288, .
[2]Proposing a three-phase model for predicting the mechanical properties of mortar and concrete ( and ), In Materials Today Communications, volume 29, .
[1]Stability Analysis of Colombo-Katunayaka Expressway Using Finite Element and Limit Equilibrium Methods ( and ), In Indian Geotechnical Journal, volume 49, .
National Journals
1 result
[1]Effect of Salinity on Mechanical Behaviour of Well Cement: Application to Carbon Capture and Storage Wells. ( and ), In Engineer: Journal of the Institution of Engineers, Sri Lanka, volume 49, .
International Conference and Workshop Papers
9 results
[9]Numerical Simulation of Chloride Ion Ingression in Mortar Incorporating the Effect of ITZ Using an Integrated COMSOL-IPHREEQC Framework (), In In International RILEM Conference on Synergising expertise towards sustainability and robustness of cement-based materials and concrete structures (Synercrete23), .
[8]Effect of Carbonation on Microstructure of Cement Pastes with Different Water-to-Cement Ratios (), In In International Conference on Sustainable Built Environment(ICSBE2022), .
[7]An Integrated Diffusion-Geochemical Framework for Carbonation of Cement Paste (), In In 76th Cement Technology Conference, .
[6]Coupled Multi-Ionic Transport model with Hydration Model for the Cholride Ion Ingression in Cement Paste (), In In Japan Concrete Institute (JCI) Annual Convention, .
[5]Coupling CO2(g) diffusion and Geochemistry for Carbonation of Cement Paste (), In In 76th RILEM Annual Week and International Conference on Regeneration and Conservation of Structures, .
[4]Fe Incorporation in Cement Hydrates: Experiments and Thermodynamic Modeling ( and ), In In 4th International RILEM conference on Microstructure Related Durability of Cementitious Composites (Microdurability2020), .
[3]A Multiscale Model for Predicting the Mechanical Properties of Cement Paste ( and ), In In 4th International RILEM conference on Microstructure Related Durability of Cementitious Composites (Microdurability2020), .
[2]Prediction of the Stress-Strain Relationship of Cement Paste Using Comsol-Iphreeqc ( and ), In In International Conference on Advances in Sustainable Construction Materials and Structures (RILEM), .
[1]A Multi-scale Model for Predicting the Compressive Strength of Ordinary Portland Cement (OPC) ( and ), In 10th International conference on structural Engineering and Construction management (ICSECM2019), .