Behavior of Modified Reactive Powder Concrete Containing Sustainable Materials and Reinforced with Micro-Steel Fibers

Reusing and recycling construction debris offers intriguing opportunities for resource conservation and waste disposal site economies. This study investigates the feasibility of using 10 mm crushed brick as coarse aggregate in Modified Reactive Powder Concrete. Natural sand was substituted with crushed brick aggregate by 25, 50, and 100%. Up to 7 and 28 days of age, the tensile strength, absorption, and void content of the mixtures were compared with those of a mixture without coarse aggregate. According to the test results, it is feasible to produce Modified Reactive Powder Concrete (MRPC) with coarse aggregate or shattered bricks. Compared to the reference mixture, the tensile strength of MRPC decreased as the replacement ratio of broken bricks increased. At 7 and 28 days of testing, the tensile strength increased by 10.2 and 12.06 with 25% crushed bricks compared to normal reactive powder concrete. Tensile strength decreased by 7.2% and 6.27% at 7 days and by 9.89% and 8.87% at 28 days when replacing fine sand with crushed brick aggregate at rates of 50% and 100%, respectively. Compared to the reference mixture, the absorption and void content of MRPC with 25, 50, and 100% crushed brick increased by 13.6, 61.2, and 116% and 15.9, 62.1, and 136%, respectively.