Effect of using constructional waste on strength properties of normal concrete

The main solid waste production in the world is the.construction.and.demolition waste constituents. Thispaper discuss the effect of replacement of waste Red.Clay.Brick.Powder (RCBP) on the mechanical properties of concrete (C25) at both conditions; fresh and hardened concrete through using of different partial replacement of powdered brick with cement until 50 percent by weight (0% , 5% , 10% , 15% , 20% , 25% and 50% ) andreplacing10% of microsilica fume (MSF) by weight replacement of cement to produce concrete and to reduce theimpact.on.environment.by.consuming the material generally considered as waste product. Crushed red clay brick and sieved through 75µm sieve size to achieve fineness as in cement. Cubes of size 150mm, Cylinders of size 300mm x 150mm and prisms of size 100mm x 100mm x 500mm were casted and tested.Workability (slump flow), compressive strength and splitting tensile strength for 7, 14 and 28 days; and the modulus of rupture and the modulus of elasticity for 28 days, were investigation. The results were compared with the referencespecimen that casted with normal concrete only.The addition was the use of waste as an alternative to cement and up to 20% with a slight decrease in the properties of concrete compared with ordinary concrete.