Gideon A. Lyngdoh

Ph.D. Candidate, email: glyngdoh@uri.edu

If you are interested for collaboration, please do not hesitate to reach out to me. I am a Ph.D. student in Civil & Environmental Engineering at University of Rhode Island (URI), working with Dr. Sumanta Das in Multiscale & Multiphysics Mechanics of Materials Research Laboratory (M4RL). Currently, I am a Graduate Teaching Assistant in Structural Enginnering Course Fall 2021 (Instructor: Dr. Mayrai Gindy)

Research Projects

Exploring the properties of cementitious materials from fundamental scale

Geopolymer

Geopolymer is an alternative binding material, which have gained much interest in building construction material besides cement concrete. In this project, we propose a realistic molecular structure of geopolymer gel, which is the main binding phase in geopolymer paste using Molecular Dynamics (MD) simulation. The unique finding in this work is the presence of the interlayer similar to Calcium-Silicate-Hydrate (CSH) in hardened cement paste. Our first work is published in Journal of Chemical Physics (2019).

2019 - Present

Using machine learning to understand the structure-properties relationship

Calcium Silicate Hydrate (CSH)

In this work, we synergistically integrate Machine learning techniques with High-throughput Molecular Dynamics simulation to study the properties of CSH. Feed forward neural network (NN) model shown better prediction performance. Using model interpretability, the major conclusions based on the SHAP model are (i) S controls the Cij components in stiffness matrix, followed by H and finally C. (ii) The shear components C44, C55, and C66 have increased contribution from H as is the case of C33 in the stiffness. This could be attributed to the layered nature of CSH where in the in-plane movements are primarily controlled by the water molecules, while the normal stiffness is mainly controlled by the silicate network. This work is published in Nature-Scientific Reports (2020).

2020 - Present

Research Interests

My research interest is to understanding the underlying structural properties in the cementitious-composite material from the fundamental scale and upscaling the properties to micro-macro scale. Using machine learning techniques, we try to unfold the variables that controlled the properties of the structure from the experimental or simulated data.

Apart from research works, I enjoy my free time in watching Anime and reading Manga. I also spent my free time in learning latest development in numerical model.

Teaching Experience

University of Rhode Island (URI)

Mechanics of Material (Spring 2020, Spring 2021)
5 Hours recitation classes and 1 hour discussion class. I graded the quizes, mid-term exams and final exam.
Structural Analysis (Fall 2019, Fall 2020)
I graded the assignments, quizes, mid-term exams, projects and final exam.
Structural Analysis Laboratory (Fall 2019, Fall 2020)
5 Hours teaching classes. I graded the laboratory reports and projects and assisted in running the analysis in StaddPro
Design of Reinforced Concrete Structures (Fall 2020)
I assisted in running the numerical analysis in StaadPro and Abaqus.

Indian institute of Technology Kanpur (IITK)

Varun Computer Laboratory (Fall 2015 - Spring 2016)
Monitoring the computer hardwares and softwares.
Finite Element Analysis (Fall 2016)
Graded the assigments, quizes, mid-term exams, and final exam.
Analysis and design of earthquake resistant structures (Spring 2017)
Responsible for grading the assignments, quizes and the mid-term exams.

Education

University of Rhode Island (URI)

Ph.D. Candidate
Civil & Environmental Engineering
2018 - present

Indian institute of Technology Kanpur (IITK)

master of technology (M. Tech)
Civil Engineering - Structural Engineering
2015 - 2017

Jabalpur Engineering College (JEC)

Bachelor of Engineering (B.E.)
Civil Engineering
2010 - 2014