الفهرس 
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Abstract
The objective of this research was to study the effect of resilient modulus (MR) for flexible pavement layers constructed on cohesive soil (clay). Stresses on pavement and the resultant response are the combined reaction of loading, subgrade and pavement material characteristics. Subgrade materials are typically characterized by the resistance to deformation under loads, which can be either a measure of their strength or stiffness.
The stiffness or resilient modulus (MR) of pavement materials is an important material property in any design/analysis procedure for flexible pavement. The resilient modulus is determined in laboratory by using the dynamic triaxial shear device. However, it is usually difficult to measure the resilient modulus in laboratory as well as in field. Correlations between resilient modulus and other soil strength parameters were developed to easily verify the resilient modulus (MR) of pavement materials on site. Therefore, comprehensive experimental work and laboratory tests were carried out on selected pavement layers; subgrade, subbase and base materials.
This study presents methodology of a laboratory-testing program that was conducted to develop a correlation between the resilient modulus (MR) and California Bearing Ratio (CBR) for pavement layers (subgrade, subbase and base course). Unfortunately, the dynamic triaxial shear device was not available at many of the investigated laboratories. The modulus of subgrade reaction (K) was initially determined for the pavement layers by performing laboratory tests.
The resilient modulus (MR) was determined using AASHTO (1993) model (equation) which correlates the subgrade reaction (K) with the resilient modulus (MR). The obtained correlations between CBR and MR enabled the development of empirical formulae that can be used to predict the resilient modulus for pavement layers for both granular layers and fine soil.
The effect of resilient modulus (MR) on the stress distribution, strain distribution and displacement in pavement layers under wheel loads was studied using a Finite Element Model (FEM) PLAXIS 3D FOUNDATION.
The objective of this research was to study the effect of resilient modulus (MR) for flexible pavement layers constructed on cohesive soil (clay). Stresses on pavement and the resultant response are the combined reaction of loading, subgrade and pavement material characteristics. Subgrade materials are typically characterized by the resistance to deformation under loads, which can be either a measure of their strength or stiffness.
The stiffness or resilient modulus (MR) of pavement materials is an important material property in any design/analysis procedure for flexible pavement. The resilient modulus is determined in laboratory by using the dynamic triaxial shear device. However, it is usually difficult to measure the resilient modulus in laboratory as well as in field. Correlations between resilient modulus and other soil strength parameters were developed to easily verify the resilient modulus (MR) of pavement materials on site. Therefore, comprehensive experimental work and laboratory tests were carried out on selected pavement layers; subgrade, subbase and base materials.
This study presents methodology of a laboratory-testing program that was conducted to develop a correlation between the resilient modulus (MR) and California Bearing Ratio (CBR) for pavement layers (subgrade, subbase and base course). Unfortunately, the dynamic triaxial shear device was not available at many of the investigated laboratories. The modulus of subgrade reaction (K) was initially determined for the pavement layers by performing laboratory tests.
The resilient modulus (MR) was determined using AASHTO (1993) model (equation) which correlates the subgrade reaction (K) with the resilient modulus (MR). The obtained correlations between CBR and MR enabled the development of empirical formulae that can be used to predict the resilient modulus for pavement layers for both granular layers and fine soil.
The effect of resilient modulus (MR) on the stress distribution, strain distribution and displacement in pavement layers under wheel loads was studied using a Finite Element Model (FEM) PLAXIS 3D FOUNDATION.
The objective of this research was to study the effect of resilient modulus (MR) for flexible pavement layers constructed on cohesive soil (clay). Stresses on pavement and the resultant response are the combined reaction of loading, subgrade and pavement material characteristics. Subgrade materials are typically characterized by the resistance to deformation under loads, which can be either a measure of their strength or stiffness.
The stiffness or resilient modulus (MR) of pavement materials is an important material property in any design/analysis procedure for flexible pavement. The resilient modulus is determined in laboratory by using the dynamic triaxial shear device. However, it is usually difficult to measure the resilient modulus in laboratory as well as in field. Correlations between resilient modulus and other soil strength parameters were developed to easily verify the resilient modulus (MR) of pavement materials on site. Therefore, comprehensive experimental work and laboratory tests were carried out on selected pavement layers; subgrade, subbase and base materials.
This study presents methodology of a laboratory-testing program that was conducted to develop a correlation between the resilient modulus (MR) and California Bearing Ratio (CBR) for pavement layers (subgrade, subbase and base course). Unfortunately, the dynamic triaxial shear device was not available at many of the investigated laboratories. The modulus of subgrade reaction (K) was initially determined for the pavement layers by performing laboratory tests.
The resilient modulus (MR) was determined using AASHTO (1993) model (equation) which correlates the subgrade reaction (K) with the resilient modulus (MR). The obtained correlations between CBR and MR enabled the development of empirical formulae that can be used to predict the resilient modulus for pavement layers for both granular layers and fine soil.
The effect of resilient modulus (MR) on the stress distribution, strain distribution and displacement in pavement layers under wheel loads was studied using a Finite Element Model (FEM) PLAXIS 3D FOUNDATION.
The objective of this research was to study the effect of resilient modulus (MR) for flexible pavement layers constructed on cohesive soil (clay). Stresses on pavement and the resultant response are the combined reaction of loading, subgrade and pavement material characteristics. Subgrade materials are typically characterized by the resistance to deformation under loads, which can be either a measure of their strength or stiffness.
The stiffness or resilient modulus (MR) of pavement materials is an important material property in any design/analysis procedure for flexible pavement. The resilient modulus is determined in laboratory by using the dynamic triaxial shear device. However, it is usually difficult to measure the resilient modulus in laboratory as well as in field. Correlations between resilient modulus and other soil strength parameters were developed to easily verify the resilient modulus (MR) of pavement materials on site. Therefore, comprehensive experimental work and laboratory tests were carried out on selected pavement layers; subgrade, subbase and base materials.
This study presents methodology of a laboratory-testing program that was conducted to develop a correlation between the resilient modulus (MR) and California Bearing Ratio (CBR) for pavement layers (subgrade, subbase and base course). Unfortunately, the dynamic triaxial shear device was not available at many of the investigated laboratories. The modulus of subgrade reaction (K) was initially determined for the pavement layers by performing laboratory tests.
The resilient modulus (MR) was determined using AASHTO (1993) model (equation) which correlates the subgrade reaction (K) with the resilient modulus (MR). The obtained correlations between CBR and MR enabled the development of empirical formulae that can be used to predict the resilient modulus for pavement layers for both granular layers and fine soil.
The effect of resilient modulus (MR) on the stress distribution, strain distribution and displacement in pavement layers under wheel loads was studied using a Finite Element Model (FEM) PLAXIS 3D FOUNDATION.
The objective of this research was to study the effect of resilient modulus (MR) for flexible pavement layers constructed on cohesive soil (clay). Stresses on pavement and the resultant response are the combined reaction of loading, subgrade and pavement material characteristics. Subgrade materials are typically characterized by the resistance to deformation under loads, which can be either a measure of their strength or stiffness.
The stiffness or resilient modulus (MR) of pavement materials is an important material property in any design/analysis procedure for flexible pavement. The resilient modulus is determined in laboratory by using the dynamic triaxial shear device. However, it is usually difficult to measure the resilient modulus in laboratory as well as in field. Correlations between resilient modulus and other soil strength parameters were developed to easily verify the resilient modulus (MR) of pavement materials on site. Therefore, comprehensive experimental work and laboratory tests were carried out on selected pavement layers; subgrade, subbase and base materials.
This study presents methodology of a laboratory-testing program that was conducted to develop a correlation between the resilient modulus (MR) and California Bearing Ratio (CBR) for pavement layers (subgrade, subbase and base course). Unfortunately, the dynamic triaxial shear device was not available at many of the investigated laboratories. The modulus of subgrade reaction (K) was initially determined for the pavement layers by performing laboratory tests.
The resilient modulus (MR) was determined using AASHTO (1993) model (equation) which correlates the subgrade reaction (K) with the resilient modulus (MR). The obtained correlations between CBR and MR enabled the development of empirical formulae that can be used to predict the resilient modulus for pavement layers for both granular layers and fine soil.
The effect of resilient modulus (MR) on the stress distribution, strain distribution and displacement in pavement layers under wheel loads was studied using a Finite Element Model (FEM) PLAXIS 3D FOUNDATION.