Ahmed Youssef Abdel Razek- Doctor of Philosophy
- PhD at Queen's University
Ahmed Youssef Abdel Razek
- Doctor of Philosophy
- PhD at Queen's University
About
12
Publications
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Introduction
My research interests have developed over the course of my masters and PhD. They are mostly focused on investigating the mechanical and hydraulic performance of different materials, either soil mixtures or synthetic products, used in Geotechnical/ Geoenvironmental applications.
My recent research investigated the performance of geosynthetic clay liners (GCLs) in containment of brine and landfill applications. Laboratory investigation of different GCLs subjected to different permeants and normal stresses was performed to assess the hydraulic performance of GCL and its variation with time. Thereafter, a numerical and semi-analytical study were conducted to assess the environmental impact of leakage through composite liners for geomembrane (GMB) wrinkles and failed seams.
Current institution
Publications
Publications (12)
The use of granulated recycled rubber as a lightweight material in civil engineering applications has been widely growing over the past 20 years. Processed waste tires mixed with soils have been introduced as lightweight fills for slopes, retaining walls, and embankments. It has also been considered as a damping material under foundations in seismi...
The interface transmissivity (θ) of two multicomponent geosynthetic clay liners (GCLs) is investigated upon hydration and permeation with a highly saline solution (TDS ≈ 260,000 mg/l; Na⁺ ~ 95,000 mg/l; K⁺~12,000 mg/l) at two stress levels (10 kPa and 150 kPa). One GCL had a smooth 0.2 mm-thick coating whereas the second GCL had a textured 1 mm-thi...
The interface transmissivity (θ) and hydraulic conductivity (k) are measured for two geosynthetic clay liners (GCLs), one with polymer-enhanced bentonite, when hydrated and permeated with saline (brine) solutions at three different concentrations and Reverse Osmosis (RO) water. Two interface transmissivity values are reported, the 2-week (θ 2-week...
A laboratory investigation of the interface transmissivity is reported for five different geosynthetic clay liners (GCLs) and a range of different geomembranes (GMBs) for a range of stresses from 10 to 150 kPa. The GCLs were prehydrated under normal stress before permeation. The GCLs examined comprised three multicomponent (a smooth coated, a smoot...
The leakage and the peak chloride concentration in an aquifer for a single composite liner facility is modelled for (i) a hole in a geomembrane wrinkle and (ii) a failed seam. A method using a closed-form solution to calculate leakage together with a l½-dimensional (l½D) semi-analytic contaminant transport model is proposed, and the results compare...
Geomembrane (GMB) are often used in conjunction with a geosynthetic clay liner (GCL), compacted clay liner (CCL), or both to form a composite liner for a wide range of hydraulic containment applications, including landfill liners, surface impoundments (e.g., ponds, lagoons), tailings storage facilities, and heap leach pads to minimize leakage. Ofte...
Composite liners are comprised of geomembrane (GMB) overlying either geosynthetic clay liner (GCL) or compacted clay liner (CCL) or both. In a composite liner, the GMB acts as the primary resistance to advective contaminant transport. Even with strict construction quality control program, the occurrence of holes in the GMB is common creating flow p...
The use of granulated recycled rubber as a lightweight material in civil engineering applications has been widely growing over the past two decades. Understanding the properties of sand-rubber mixtures is essential to evaluate its performance in geotechnical applications. However, limited experimental data are available on mixtures of sand and gran...
The use of granulated recycled rubber as a lightweight material in civil engineering applications has been widely growing over the past two decades. Understanding the properties of sand-rubber mixtures is essential to evaluate its performance in geotechnical applications. However, limited experimental data are available on mixtures of sand and gran...
