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Comparison of Resilient Modulus of Unbound Layers Obtained from Clegg Hammer and Laboratory Test
Resilient modulus (MR) of unbound layers such as base, subbase, and subgrade materials is one of the most important properties required for efficient, effective, and competent structural design of a pavement. The MR values are usually determined by conducting repeated load triaxial compression tests in the laboratory. However, due to the complexity, huge time, and effort associated with it, the researchers have attempted to find several alternative nondestructive tests to determine the in-situ stiffness of unbound layers. In this study, the nondestructive Clegg impact hammer (CIH) tests were conducted on the unbound layers of various highways of New Mexico during the construction. In addition to that laboratory resilient modulus tests were performed on the same subgrade and base materials collected from the Clegg hammer test sites. A comparison was made between the resilient modulus values obtained from the laboratory resilient modulus test and Clegg hammer test. Results revealed that the laboratory and CIH modulus are very close to each other for the subgrade soils, whereas no suitable relationship was found for the base course materials.
Comparison of Resilient Modulus of Unbound Layers Obtained from Clegg Hammer and Laboratory Test
Resilient modulus (MR) of unbound layers such as base, subbase, and subgrade materials is one of the most important properties required for efficient, effective, and competent structural design of a pavement. The MR values are usually determined by conducting repeated load triaxial compression tests in the laboratory. However, due to the complexity, huge time, and effort associated with it, the researchers have attempted to find several alternative nondestructive tests to determine the in-situ stiffness of unbound layers. In this study, the nondestructive Clegg impact hammer (CIH) tests were conducted on the unbound layers of various highways of New Mexico during the construction. In addition to that laboratory resilient modulus tests were performed on the same subgrade and base materials collected from the Clegg hammer test sites. A comparison was made between the resilient modulus values obtained from the laboratory resilient modulus test and Clegg hammer test. Results revealed that the laboratory and CIH modulus are very close to each other for the subgrade soils, whereas no suitable relationship was found for the base course materials.
Comparison of Resilient Modulus of Unbound Layers Obtained from Clegg Hammer and Laboratory Test
Hasan, Md. Mehedi (author) / Tarefder, Rafiqul A. (author)
International Conference on Sustainable Infrastructure 2017 ; 2017 ; New York, New York
2017-10-24
Conference paper
Electronic Resource
English