S. Abo-Qudais - Academia.edu (original) (raw)
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Birla Institute of Technology, Mesra (Ranchi) India
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Papers by S. Abo-Qudais
Road Materials and Pavement Design, 2004
ABSTRACT This study was devoted to evaluate the effect of aggregate gradation, temperature, and t... more ABSTRACT This study was devoted to evaluate the effect of aggregate gradation, temperature, and type of asphalt cement on the permanent deformation of Hot-Mix Asphalt (HMA). An experimental program was conducted to characterize the viscoelastic deformation response of asphalt mixture using the static creep test. The specimen was exposed to a constant vertical stress of 100 KPa and the vertical deformation of the specimen was monitored through linear variable differential transducers (LVDTs). All tests were conducted within a temperature-controlled chamber to keep the temperature constant throughout the test. Time-temperature and time-aggregate gradation shift factors for each evaluated type of HMA were estimated using plots of log time versus log creep compliance. If the deformations under reference temperature or reference gradation are known, those under given temperature or any given gradation can be obtained using shift factor. Also, viscoelastic models were developed to represent the deformation behavior of HMA under constant stress. The collected data was analyzed to study the effects of aggregate gradation, testing temperature, and asphalt consistency on creep behavior. The effect of temperature variation on creep behavior was found to be more significant at low temperatures and long loading time than those at high temperatures and short loading time. Moreover, aggregate gradation found to has a significant effect on creep behavior, the lowest creep deformation was for HMA prepared using ASTM upper limit gradation. While HMA prepared using ASTM mid-limits aggregate gradation was the least affected by temperature variation.
Transportation Research Record, 1999
... Thus, the joint has to have a width range that meets construction specifications and temperat... more ... Thus, the joint has to have a width range that meets construction specifications and temperature ... In addition, as the joint width decreases, greater stress is required to achieve a specific ... The lower the horizontal deflection, the greater the number of deflection cycles the sealant ...
Journal of Transportation Engineering, 1995
Journal of ASTM International, 2005
Journal of Testing and Evaluation, 2005
European Journal of Soil Science, 2006
Detachment of soil particles by the processes of splash from rainfall and shallow flow from surfa... more Detachment of soil particles by the processes of splash from rainfall and shallow flow from surface runoff is influenced by soil cohesion, soil aggregate properties, and characteristics of this flow. We have evaluated relationships between rates of detachment, aggregate size, and tensile strength of the soil. Soil and water losses were determined in the laboratory from sieved air-dry samples on three aggregate size ranges of two clay loam soils differing in particle-size distribution and organic matter. Tensile strength was measured for each aggregate size range. The results showed that as clod size increased, detachment rates increased and interaggregate tensile strength decreased. Wash erosion increased as initial clod size increased despite a decrease in runoff. Final rates of loss by splash were greater from the largest clods than from the smaller clods. Finally, splashed material was larger in size than material washed off. The fact that the size of the splashed material was larger than washed-off material shows that material in the wash suffered more impact by raindrops and thus was more likely to be fragmented.
Road Materials and Pavement Design, 2004
ABSTRACT This study was devoted to evaluate the effect of aggregate gradation, temperature, and t... more ABSTRACT This study was devoted to evaluate the effect of aggregate gradation, temperature, and type of asphalt cement on the permanent deformation of Hot-Mix Asphalt (HMA). An experimental program was conducted to characterize the viscoelastic deformation response of asphalt mixture using the static creep test. The specimen was exposed to a constant vertical stress of 100 KPa and the vertical deformation of the specimen was monitored through linear variable differential transducers (LVDTs). All tests were conducted within a temperature-controlled chamber to keep the temperature constant throughout the test. Time-temperature and time-aggregate gradation shift factors for each evaluated type of HMA were estimated using plots of log time versus log creep compliance. If the deformations under reference temperature or reference gradation are known, those under given temperature or any given gradation can be obtained using shift factor. Also, viscoelastic models were developed to represent the deformation behavior of HMA under constant stress. The collected data was analyzed to study the effects of aggregate gradation, testing temperature, and asphalt consistency on creep behavior. The effect of temperature variation on creep behavior was found to be more significant at low temperatures and long loading time than those at high temperatures and short loading time. Moreover, aggregate gradation found to has a significant effect on creep behavior, the lowest creep deformation was for HMA prepared using ASTM upper limit gradation. While HMA prepared using ASTM mid-limits aggregate gradation was the least affected by temperature variation.
Transportation Research Record, 1999
... Thus, the joint has to have a width range that meets construction specifications and temperat... more ... Thus, the joint has to have a width range that meets construction specifications and temperature ... In addition, as the joint width decreases, greater stress is required to achieve a specific ... The lower the horizontal deflection, the greater the number of deflection cycles the sealant ...
Journal of Transportation Engineering, 1995
Journal of ASTM International, 2005
Journal of Testing and Evaluation, 2005
European Journal of Soil Science, 2006
Detachment of soil particles by the processes of splash from rainfall and shallow flow from surfa... more Detachment of soil particles by the processes of splash from rainfall and shallow flow from surface runoff is influenced by soil cohesion, soil aggregate properties, and characteristics of this flow. We have evaluated relationships between rates of detachment, aggregate size, and tensile strength of the soil. Soil and water losses were determined in the laboratory from sieved air-dry samples on three aggregate size ranges of two clay loam soils differing in particle-size distribution and organic matter. Tensile strength was measured for each aggregate size range. The results showed that as clod size increased, detachment rates increased and interaggregate tensile strength decreased. Wash erosion increased as initial clod size increased despite a decrease in runoff. Final rates of loss by splash were greater from the largest clods than from the smaller clods. Finally, splashed material was larger in size than material washed off. The fact that the size of the splashed material was larger than washed-off material shows that material in the wash suffered more impact by raindrops and thus was more likely to be fragmented.