Abstract
This paper contains the results of laboratory tests conducted on a lightweight aggregate reinforced with a geogrid. The large-size shear tests included direct simple shear tests on the aggregate, shear tests on the aggregate reinforced with a uniaxial geogrid, and geogrid pullout tests. All tests were performed on air-dried material samples. Each type of test was repeated using three different confining pressures representing different heights of fill. The angle of internal friction ( φ) of the lightweight aggregate material and its interface friction angle ( δ) with the geogrid were found to be 52° and 48°, respectively. These values represent an efficiency of friction angle mobilization ( E φ ) of about 87%. Some crushing occurred in the material under a higher confining pressure specifically near the front edge and center of the shearbox.
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