Abstract
To investigate the interface shear characteristics between various geosynthetics and recycled concrete aggregate (RCA), 30 large-scale monotonic direct shear tests were conducted. The main work was to analyse the effect of a biaxial polypropylene geogrid, a glass fiber geogrid, a warp-knitted polyester geogrid, a woven geotextile, and geonet on the interface shear properties of RCA. The test results show that adding a biaxial polypropylene geogrid or a geonet to RCA can improve its interface shear strength. The inclusion of glass fiber geogrids, warp-knitted polyester geogrids, and woven geotextiles decrease the interface shear strength of RCA. The reinforcing RCA with geosynthetics can effectively suppress its shear dilation, and the change in internal friction angle is consistent with the change law of the material interface enhancement coefficient. Finally, the aperture size of a geogrid has a significant effect on the mechanical properties of the geogrid-RCA interface. The interface shear strength increases first and then decreases with an increase in the ratio between aperture size and median particle diameter. It is concluded that there is an optimal range of aperture ratio between a geogrid and RCA.
Highlights
In recent years, construction and demolition (C&D) waste has increased year by year, among which waste concrete is the main component, reaching 50% [1]
To better understand the shear mechanism of reinforced recycle concrete aggregate interface, a series of direct shear tests were conducted in this study on the interface between recycled concrete aggregate (RCA) with various geosynthetics types. e aim in this paper is to analyse the influence of various geosynthetic types, geogrid aperture sizes, and normal stresses on the shear strength of the reinforced RCA interface through large-scale direct shear apparatus
Before the stress-strain relation curves between RCA and various geosynthetic types were derived, a shear strength analysis of the interface between gravel and RCA was used as a reference
Summary
Construction and demolition (C&D) waste has increased year by year, among which waste concrete is the main component, reaching 50% [1]. To analyse the shear strength of the reinforced soil interface, the direct shear test is one of the most important research methods [13, 14]. Laboratory direct shear test studies have shown that different stress levels and different types of fillers cause great differences and complexities in the shear strengths and deformations of the interface between the reinforcement and Advances in Civil Engineering the soil [15,16,17]. To better understand the shear mechanism of reinforced recycle concrete aggregate interface, a series of direct shear tests were conducted in this study on the interface between RCA with various geosynthetics types. E aim in this paper is to analyse the influence of various geosynthetic types, geogrid aperture sizes, and normal stresses on the shear strength of the reinforced RCA interface through large-scale direct shear apparatus To better understand the shear mechanism of reinforced recycle concrete aggregate interface, a series of direct shear tests were conducted in this study on the interface between RCA with various geosynthetics types. e aim in this paper is to analyse the influence of various geosynthetic types, geogrid aperture sizes, and normal stresses on the shear strength of the reinforced RCA interface through large-scale direct shear apparatus
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