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- W141229241 abstract "Methodologies were identified which involved the use of the accelerated pavement aging system (APAS) to induce age-hardening of the pavement in the accelerated pavement testing (APT) facility and achieve stiffness profiles consistent with those observed in field-aged pavements, followed by loading with and without wander using the heavy vehicle simulator (HVS). These approaches would allow the evaluation of several hypotheses associated with the development and accumulation of damage and its effect on top-down cracking, as well as hypotheses associated with the energy-based cracking criteria developed in earlier Florida Department of Transportation (FDOT) research efforts. Properties determined from falling weight deflectometer (FWD) tests on the pavement sections and Superpave indirect tension tests (IDT) performed on asphalt concrete cores obtained from the pavements at different aging levels have been used to predict stresses, strains, and energies due to applied wheel loads. Excellent correspondence has been observed between predicted and measured strains. Strains measured using gages epoxied to the surface of the pavement are excellent tools for evaluation of pavement load response, but are not good indicators of the development of damage. Top-down cracking was achieved only when the pavement was aged beyond normal levels to reduce fracture resistance and minimize healing potential. However, in contrast with field observations, where top-down cracks are longitudinal, the cracks developed by the heavy vehicle simulator (HVS) were transverse. Theoretical analyses indicated that transverse cracks were explained by the much slower speed of the HVS load that resulted in much greater damage in the longitudinal direction than in the transverse direction. Several recommendations were made to conduct further investigations and modify the existing APT system to better simulate the mechanisms that lead to top-down cracking in the field." @default.
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- W141229241 date "2007-09-01" @default.
- W141229241 modified "2023-09-22" @default.
- W141229241 title "Develop Methodologies/Protocols to Assess Cracking Potential of Asphalt Mixtures Using Accelerated Pavement Testing" @default.
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