By way of finite element modeling and experimental testing the interaction between CFRP (Carbon Fiber Reinforced Polymer) sheets and concrete/steel beams is being investigated. Effects of fatigue loading and temperature susceptibility are under investigation as to their contribution to deterioration effects.
Advisor: Dr. Frank Yazdani & Dr. Yail Jimmy Kim
The study of recycled asphalt pavement (RAP) for use in new flexible pavement projects. This includes investigation of physical and chemical properties for the development of strategies to utilize RAP in the pavement sub layers and the pavement surface.
Advisor: Dr. Magdy Abdelrahman
My research is focused on materials and methods that improve the durability of concrete pavements. This includes the experiments design to evaluate the factors that affect the durability of concrete pavements. The outcomes of the research will provide sustainable solutions to concrete durability problems in roads, highways, and airport pavements.
Advisor: Dr. Zhili(Jerry)Gao
The utilization of recycled materials in flexible asphalt pavement is a way to sustainable development. Our research work is focused towards the employment of recycled scrap tires known as crumb rubber modifier (CRM) in the modification of asphalt. Through this approach, we save the environment by using scrap tires that were supposed to be land filled. In addition, we obtain comparable properties to those of asphalt virgin modifiers by controlling the interaction conditions between asphalt and CRM.
Advisors: Dr. Magdy Abdelrahman
Fundamental study of the molecular interactions between different constituents of nanocomposite materials such as polymer clay nanocomposites and natural bones with the aid of spectroscopy, and relate them to nanomechanical properties of these materials.
Advisor: Dr. Kalpana Katti
Co-Advisor: Dr. Dinesh Katti
Polydimethylsiloxane and other polymers are used in surface modification of nanoparticles for environmental remediation. Low molecular PDMS are biodegradable in a particular soil moisture condition; however, high molecular PDMS are non-biodegradable in both soil and water. Biodegradation of PDMS is tested for the research using both pure and mix microbial consortium. Work is also being done on the nitrification of ammonia oxidizing archaea (AOA).
Advisors: Dr. Achintya Bezbaruah & Dr. Eakalak Khan
As it is important to retain virgin aggregates for the future generations and in the same time to reuse the waste materials generated from the pavement industry in an useful way to our environment. My research work in this area is related to utilizing Recycled Asphalt Pavement (RAP) in the base layer of the pavement cross-section. The base layer in the flexible pavements is the main component that is responsible on carrying the loads of traffic and increasing the structural capacity of this layer leading to a longer life time for the pavement.
Advisors: Dr. Magdy Abdelrahman
The durability of GFRP reinforcing bars embedded in concrete under harsh environmental conditions such as freeze-thaw cycles, wet and dry cycles, thermal cycles. Main work is classified into bond behavior, degradation mechanism and durability prediction. Contributions will be used for safety assessment of bridges in terms of service-life performance. Impact analysis of steel and concrete materials. Crack development and propogation will be studied by using FEM and numerical methods. Fatigue life analysis of cable-stayed bridge, considering the first-structure system effect on remaining fatigue life.
Advisor: Dr. Zhibin Lin
My current research focuses on modeling of surface microtopography and the related hydrologic processes. Specifically, I am using the puddle-to-puddle (P2P) modeling system to evaluate the effects of DEM resolution on microtopographic characteristics, hydrologic connectivity, and modeling of hydrologic processes; and to assess the influences of multiple rainfall events on surface and subsurface processes.
Advisor: Dr. Xuefeng (Michael) Chu
My research is aimed to study the possibility of using the green binder “Geopolymer” as an accelerated pavement repair material under various aggressive environments. In order to achieve this goal, accelerated curing of Geopolymer in ambient conditions and durability of bonding between Geopolymer and existing concrete are the two key points to address. Preliminary results have been obtained, including bonding strength of Geopolymer and existing concrete, influence of different admixtures and effect of different mix ratios, such as SiO2/Na2O and water to solid ratio, on the properties of Geoploymer concrete and its bonding strength with existing concrete. Further experiments will be conducted to characterize the freeze-thaw, wet-dry, weariness, and acid resistance durability of the bonding between Geopolymer and the existing concrete through accelerated aging tests.
Advisor: Dr. Mijia Yang
The main research objective is to assess risk and life cycle cost for water and wastewater management associated with hydraulic fracturing. The focus of the study is on hydraulic fracturing performed in the principal shale gas formations in the United States (Marcellus, Bakken and Barnett) and the impact it has on the environment. The study involves modeling and analysis of different water and wastewater management scenarios and evaluation of the results.
Advisors: Dr. Eakalak Khan & Dr. Om Prakash Yadav
Composition self-sensing thermal sprayed coating for pipeline corrosion prevention and mitigation. In the project, cooperate with Mechanical Engineering department to innovative the pipeline coating technique. Also, the sensors will be conducted on pipeline coating that could make a self-sensing pipeline to monitor the corrosion.
Advisor: Dr. Ying Huang
A fully calibrated and operational Soil Water Assessment Tool (SWAT) model is developed for load estimation (e.g. runoff, sediment, nitrogen, phosphorus) and load distribution among different pollutant sources for TMDL development. This project would benefit watershed model development for TMDL purposes and surface water quality management in North Dakota.
Advisor: Dr. G. Padmanabhan
The study includes the structural behavior of low-rise buildings subjected to extreme load effects. Finite element modeling is a major research approach to address such behavior. Research results are expected to improve present code provisions.
Advisor: Dr. Jimmy Kim
Work is being performed on the effect of microtopography on the characterization of the hydrograph. Improved models of the partition between infiltration and runoff generation, flow path delineation and sink filling have given way to better accuracy in predicting hydrographs at the watershed's outlet. This study involves a scaled down look into the microcosm that is small depressions in their effect on the time to ponding, time of concentration and total excess rainfall.
Advisor: Dr. Xuefeng (Michael) Chu
This research is aimed at understanding the interaction of gram negative bacteria with nanoscale zero-valent iron (NZVI) particles. The effects of NZVI on the growth of select bacterial species, Escherichia coli (ATCC 8739 & JM109) and Pseudomonas putida F1, are studied under different environmental conditions like temperature, stirring/shaking speed, presence of microbial nutrients, and the concentration of NZVI.
Advisor: Dr. Achintya Bezbaruah