Dynamic Behavior of Pavement Layers on Sand Subgrade

Hussein, Mariam M.; Fattah, Mohammed Y.; Hilal, Miami M.

doi:10.30684/etj.v39i12.1770

	Dynamic Behavior of Pavement Layers on Sand Subgrade
Engineering and Technology Journal
Article 4, Volume 39, Issue 12, December 2021, Pages 1760-1770 PDF (1.35 M)
Document Type: Research Paper
DOI: 10.30684/etj.v39i12.1770
Authors
Mariam M. Hussein^* ; Mohammed Y. Fattah; Miami M. Hilal
Civil Engineering Dept., University of Technology-Iraq, Alsina’a street,10066 Baghdad, Iraq.
Abstract
Reinforcement interlayer reduces the development of cracks in the asphalt overlay by absorbing the stresses induced by heavy traffic or underlying cracking in the early-constructed pavement. This research is dedicated to studying the behavior of pavement layers on a sand subgrade under simulated effect of earthquake. In this study, the sand layer has a thickness of 600 mm and the base course is taken as 300 mm. The asphalt layer was prepared as a panel with dimensions of 300 × 300 × 50, which represents the surface layer. These layers are experimentally tested under the influence of earthquake loading with different frequencies 0.5, 1, 1.5 Hz. The tests consist of two parts without adding the geogrid, with geogrid in the center of the base layer and between the base layer and sand layer. Loaded stresses in the three layers are monitored using stress gauge sensors, while displacements of the asphalt layer by using displacement gauge sensor. Obtained results considered models reinforced with geogrid, the stress recorded is higher than in unreinforced models but the displacement decreases by increasing the geogrid in the layers at three frequencies. When the geogrid is laid between the base course and sand layer, the stress in the sand subgrade layer is less than that in the base and asphalt layers.
Highlights
The experimental work contains of pavement layers on a sand subgrade under the effect of earthquake. The pavement layers are tested under the influence of earthquake loading with different frequencies. The tests consist of two parts without adding the geogrid, and with geogrid. Stresses in the three layers are measured and displacements of the asphalt layer. For models reinforced with geogrid, the stress recorded is higher than in unreinforced models.
Keywords
Pavement layers; geogrid reinforcement; dynamic; Stresses; Displacements

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