Hits:

Indexed by:会议论文

Date of Publication:2014-06-01

Included Journals:EI、CPCI-S、Scopus

Volume:2

Page Number:1115-1123

Key Words:Dynamic response; inverted pavement; strain gauge; MLS; ALF

Abstract:Dynamic response is an important indicator in estimating long-term performance of a pavement structure. To obtain dynamic responses, field measurement is a direct and realistic method. In this study, a multidirectional strain measurement is performed in a highway section paved by two structures: an inverted pavement and a semi-rigid pavement. Accelerated loads are imposed by a full-scale Mobile Load Simulator (MLS). A comparison on dynamic responses from the two structures is made. Two loading positions, central and eccentric loading, are performed alternately. The strains are measured by strain gauges. The results show the maximum tensile strain at the bottom of asphalt mixture in the inverted pavement is higher than that in the semi-rigid pavement at both loading positions. It is concluded that the bottom-up fatigue crack would be the potential failure mode of inverted pavement since the introduction of graded crushed stone interlayer decreases the material stiffness under asphalt mixture. Crack observation from the inverted pavement confirms this failure. The measurement under various axle amplitudes shows that there is a good agreement between strain increments and tire contacted pressure increments. Therefore, when the heavy vehicles are concerned, the tire contacted pressure, rather than the load amplitude, should be the primary parameter in fatigue prediction.