Abstract
Asphalt pavement consists of multiple layers of asphalt with a progressive decrease of nominal maximum aggregate size from the bottom to the top, which can be constructed by the double-decked or the conventional paving method (i.e., layer by layer). Reliable interface strength between the fine- and the coarse-grained layer of asphalt mixture is prerequisite to ensure the serviceability of the asphalt pavement. This study aims to compare the interface behavior of the asphalt pavement constructed by the conventional and the double-decked paving methods through laboratory and trial pavement tests. Laboratory test results show that the interface strength of the specimen prepared by the double-decked paving method is mainly contributed by the interlocking of the coarse- and the fine-grained asphalt mixture, fundamentally different from the conventional paving method, in which the interface strength is mainly provided by the tack coat oil. More importantly, the interface shear strength and the uniaxial tensile strength of specimens prepared by the double-decked paving method are about 1.5–1.8 times larger than that of specimens prepared by the conventional paving method. To verify the applicability of laboratory experimental findings to the practical engineering, a trial road was paved in situ using both double-decked and conventional paving methods. Cored specimens were collected from the trial road and their interface strengths are tested. Comparisons of the interface strength obtained from cored specimens further prove that the asphalt pavement constructed by the double-decked paving method has larger interface strength than that of the asphalt pavement constructed by the conventional paving method.
Highlights
The double-decked paving method can pave and compact two layers of asphalt mixture simultaneously during the construction of an asphalt pavement [1,2]
[3,4], asphalt the interface strength is mainly provided by the tack coat oil
The interface strength of the specimen the interlocking depth of the specimens prepared by the double-decked paving method is prepared by the conventional paving method is mainly provided by the tack coat 7–10 oil. times
Summary
The double-decked paving method can pave and compact two layers of asphalt mixture simultaneously during the construction of an asphalt pavement [1,2]. In this method, coarse- and fine-grained asphalt mixtures are added to the special paving equipment, which has two hoppers and two independent paving systems. The the upper upper layer layer of of asphalt asphalt mixture mixture is is paved paved on on the the lower lower pavement pavement layer. Both the upper and lower layer of asphalt mixture are compacted simultaneously with the paving both the upper and lower layer of asphalt mixture are compacted simultaneously with the paving equipment.
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