SHEAR STRENGTH OF CONCRETE USING RECYCLED COARSE AGGREGATE

Abstract

Along with the assumption that natural resources are being depleted, the issue of the accumulation of building and industrial waste is one of the critical issues that threatens the security of the global environment. Because it is now commonplace to reuse these resources in construction projects, it is important to understand the characteristics of concrete produced when recycled materials, particularly aggregates, are used. The shear strength of this type of concrete is one of the most crucial characteristics that must be investigated. This paper primarily examined the direct shear strength of recycled coarse aggregate concrete. Recycled aggregates were used in place of normal aggregates at replacement ratios of (0%, 25%, 50%, 75%, and 100%) using three types of molds: the L-Shape Type 1, L-Shape Type 2, and the Push off type. In addition, other mechanical properties such as compressive strength, tensile strength and flexural strength were studied. The results of the direct shear test using the push- off model were less than the results of the results from the L- shape molds. The reason for this is that the flexural stresses interfere with the shear stresses during the testing process, which reduces the resulting shear strength. In comparison to the other two molds, the L-Type mold with a depth of 70 mm produced better results, with shear strength values that are nearly equal to the square root of cube compressive strength of concrete.