Current Students

 

Hejintao Huang:
My research has been funded by GODT, NSF and Southern Company. I am working on the beneficial use of waste materials and life cycle assessment of geotechnical applications. My work takes place at the interface of geoenvironmental engineering, materials science, and geochemistry. I study the fundamental properties of waste materials, in terms of their crystalline, organic, physical, chemical, morphological, and engineering properties. My goal is to develop more sustainable materials for construction and maintenance. In addition, I perform economic feasibility analyses and lifecycle assessment. I am a skilled experimentalist, proficient in: XRD, SEM, TOC, PSA, LOI, TGA, and traditional geotechnical testing, including triaxial, consolidation, and hydraulic conductivity testing. I am also a skilled LCA software performer, proficient in OpenLCA and Simapro 9.0.


Young Suk Jung:
I am working on improving the efficiency of best management practices (BMPs) for stormwater runoff management, and my work is funded by Georgia Department of Transportation (GDOT). For evaluation of BMP performance, I study contaminant removal and hydraulic conductivity control using laboratory and field tests. From the results, I have developed an amended sand filter given input into statewide guideline for optimizing contaminant removal efficiency. Additionally, I am using the International Stormwater BMP Database to assess the environmental and economic impacts of BMP treatment system using life cycle assessment.


Junghwoon Lee:
I am working on the optimization of microbial induced calcite precipitation (MICP), a new environmentally friendly and potentially economic ground improvement technique. My research has been funded by the National Science Foundation.  The optimization includes colloidal facilitation of MICP, dissolution and precipitation of other cementing agents such as iron oxide, and the relation between flow rate, surface roughness, fine content ratio, chemical concentration, and precipitated calcite inside soil medium. The experimental studies have done at both lab scale and field scale, using different monitoring skills such as shear wave measurement using bender element, borehole test, soil column test, and measuring chemical index. The results of these studies will enable MICP to adapt a broad range of soil conditions with lessen environmental impacts. I have specialized testing skills in shear wave velocity measurement, soil-column testing, borehole testing, and microbial methods.


Lynnae Luettich:
I have been working on a research project funded by the Georgia Department of Transportation to optimize the design of post construction stormwater best management practices (BMPs) for performance while minimizing right-of-way acquisition and peak flows. My research has led me to the creation of a model that uses topographical, geotechnical, and environmental characteristics common to the considered region and produces theoretical estimations of pollutant removal. Using theories from Navier-Stokes and Darcy’s Law the model will be able to predict the amount of total suspended and dissolved solids removal before the BMP is installed in order to optimize its design. Other areas that I have researched include in-situ infiltration measurement methods, geochemistry of urban runoff, and the design and use of runoff simulators to enhance sampling. I have advanced skills using the triaxial device, MPD Infiltrometer, total stations, MATLAB, and UV spectrophotometry.


Shaivan Shivaprakash:
My research work focuses on the optimization of Microbially Induced Calcite Precipitation (MICP), a sustainable ground improvement technique. The research work is funded by National Science Foundation (NSF). In particular, I want to reduce the problem of clogging at the injection port by increasing bacterial transport using nanoparticles such as colloidal silica and surfactants. Additionally, my research work also includes the application of MICP to carbonate rich soils done in collaboration with Center for Bio-mediated and Bio-inspired Geotechnics (CBBG), Queen’s University Belfast Energy Efficient Materials Research Center (EEM), and SFI-funded Irish Center for Research in Applied Geoscience (iCRAG).


Sean Tyndale:
I am working on a project that studies fly ash, which is the lightweight byproduct that results from the combustion of coal during production of various commodities and services including electricity. While the hydraulic conductivity of fly ash is typically similar to that of silt-sized soils, it is not uncommon to encounter pockets of fly ash with significant water retention capacities. My work studies the hydraulic properties of a model particulate mixture that was composed of fine sand particles and highly porous additives including diatomaceous earth (DE) and activated carbon (AC). Measured values of hydraulic conductivity indicated that the highly porous byproducts decreased the saturated hydraulic conductivity by one to two orders of magnitude, and retained water in partially saturated conditions due to high capillary forces within their highly porous structure. My work has been supported by Southern Company.