The Mechanical Performance of Waste Concrete Ash as Cement Replacement Materials in Concrete

This paper presents an experimental study of the influences of different percentage waste concrete ash used as cement replacement materials to form a new concrete. The experimental process will be evaluated based on mechanical performance and durability of the concrete. To improve the quality of cement replacement concrete, another concrete admixture was added to work with the waste concrete ash. The mix proportioning of the waste concrete ash used is between 5% and 40% of the replacement cement materials, and for concrete admixture is fixed in optimum amounts. Every specimen is cured in water until it reaches the right age to be tested, and in this experiment, the specimens will be tested at the age of 7, 14, 28, 90 and 180 days. Based on this study, it is revealed that increasing a percentage of waste concrete ash will reduce the quality of concrete. However, the addition of concrete admixture will restore the strength of the concrete. Furthermore, it shows that an increase of Waste Concrete Ash in percentage of cement replacement will cause a loosening between the binders and aggregate, thereby lowering the compressive strength.