EXPETIMENTAL INVESTIGATION THE EFFECT OF USING WASTE CONCRETE AS PARTIAL REPLACEMENT OF COARSE AGGREGATE IN CONCRETE

Abstract

The global construction industry is one of the largest consumers of natural resources, with concrete being a major component. The disposal of waste concrete from demolished buildings, roads, and infrastructure contributes significantly to environmental pollution. High numbers of structures around the world currently need to be removed for several reasons, such as reaching the end of the expected life, or due to loss of serviceability to be replaced by new investments, or were not built by the local and international standards. Maintaining or removal of such structures leads to large quantities of concrete ruins. Reusing these concrete wastes will help in saving landfill spaces in addition to more sustainability in natural resources. The objective of this study is to investigate the possibility of using old recycled concrete as coarse aggregate to make new concrete mixes, and its effect on the evolution of the compressive strength of the new concrete mixes. Core samples for demolished concrete were tested to determine its compressive strength. The core test results can be thought of as aggregate properties for the new concrete. Then, the compressive strength and splitting tensile strength of the new recycled aggregate concrete (RAC) were determined experimentally by casting a cubes and cylinders, respectively. It was found that the evolution of compressive strength of recycled aggregate concrete.