Effect of Marble Dust on Compressive Strength of Recycled Aggregate Concrete

Abstract

The search of alternative ingredients of concrete to conserve the conventional ingredients and protect environment is an active area of research. Therefore, this research article presents laboratory investigations on compressive strength of concrete made with partial replacement of natural coarse aggregates from demolishing waste concrete and partial replacement of cement with marble dust. Recycled and conventional aggregates were used in equal dosage. Cement was replaced with marble dust from 0 to 10% in increment of 2.5%. Six concrete mixes were designed using 1:2:4 mix and 0.5 w/c ratio. Workability of each mix was evaluated by slump test. 30 standard size cylinders were prepared and cured for 28-days followed by testing for weight and compressive strength. The comparison of results with those of conventional concrete showed that 5% replacement of cement with marble dust gives 8.3% increase in compressive strength and 2% reduction in weight. Therefore, 5% replacement is concluded as the optimum dosage of the marble dust in green concrete. The outcome of the research will provide understanding of the behavior of marble dust on compressive strength of green concrete made by using demolishing waste as coarse aggregates.