MECHANICAL PROPERTIES OF RECYCLED COARSE AGGREGATE CONCRETE MADE FROM KNOWN PROPERTIES DEMOLITION WASTE

In many countries around the world, the demolition wastes disposal represents a serious problem in sustainable civil engineering structural works since such materials are accumulated in large quantities some times. When the concerns of cost and sustainability are considered in the structural design, the use of such waste as an alternative to some construction materials is highly effective and justified. The basic objective of this study is to investigate some of the preliminary properties of concrete made by self-properties controlled recycled coarse aggregate since this issue has a considerable need to improve knowledge . Two mix designs are proposed with nominal 20 and 30 MPa compressive strength, more precisely, the degree of coarse recycled aggregate partial replacement ratio taken throughout this study as 0 %, 50 % and 100 % respectively using a crushed concrete casted originally using the same mixes defined. The results showed that the degree of recycled coarse aggregate decreases in general performance of the resulted concrete. More precisely, all compressive strength, modulus of elasticity, splitting tensile strength and modulus of rapture decreased when such degree progressed. In other hand, workability give a negative impact when such ratio increased.