Volume 60

Effect of geosynthetics on shear properties of recycled construction waste Yanlin Zhang， Yingrui Ma，Changpin Luo，DEWANCKER Bart Julien

Abstract

Recycled concrete aggregates and recycled bricks, collectively known as construction and demolition wastes, are renewable resources. Considering the poor performance of recycled aggregate, geosynthetics are generally used to improve its roadability, and the geosynthetics with different strengths have an impact on the interface of the reinforced soil. The monotonic direct shear test on the interface of geosynthetics and reclaimed aggregate are studied based on large-scale direct shear instrument, and consider the influence of normal stress on the interface shear stiffness and damping ratio. Tests showed that: The peak shear stress at the recycled material / geosynthetic interface increases with the increase of the normal stress. The dilatancy of the unreinforced test is stable in the late shearing period, while the dilatancy of the reinforced test is increasing. The peak strength and residual strength of the interface are obviously improved with the increase of the strength of the glass fiber reinforced material, but the integrity of the soil is reduced to a certain extent, which affects the cohesion.

Keywords Direct shear test, Recycled construction waste, Geosynthetics