Ahmet H. Aydilek

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There has been a concentrated effort in mod-eling fluid flow in asphalt pavements, and most of the existing work has been limited to evaluation of directional permeabilities. The effects of other phenomena, such as development of flow-induced pore pressure and viscous shear stress distributions at the pore–solid interfaces, on moisture damage in an asphalt(More)
Biological processes may provide great and previously unexplored opportunities for in situ, cost effective soil improvement. A laboratory research study was conducted to evaluate the changes in geomechanical properties of sand due to microbial precipitation of calcium with Bacillus pasteurii. Direct shear tests and California bearing ratio (CBR) were(More)
Maryland State Highway Administration (SHA) is in need for evaluation of stiffness and drainage characteristics of graded aggregate base (GAB) stone delivered at highly variable gradations to the construction sites. To fulfill the current need, the mechanical and drainage properties of several Maryland GAB materials were evaluated in the laboratory and(More)
Three coal fly ashes with different acid-base characteristics and their mixtures with an embankment soil were analyzed for arsenic, copper, and chromium leaching as function of pH using batch-type water leach tests (pH 4−10). Leach tests results showed that significant Cu release occurred only at pH ~4.3 and dissolved Cr concentrations typically increased(More)
Acid mine drainage (AMD) is a phenomenon that occurs when pyrite that is present in abandoned coal mines comes in contact with oxygen and water, forming acidic water rich in dissolved metals. Grout injection into mines is a popular technique that provides a permanent solution to control AMD. The main objective of this study was to investigate the(More)
Dredged sediments are obtained from the process of dredging coastal areas and harbors in order to maintain navigable waterways. This study focuses on the potential of using dredged sediments as vertical cutoff wall backfill material. Materials used as vertical cutoff wall material are expected to have low hydraulic permeability and good workable(More)
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