Influence of brick dust, stone dust, and recycled fine aggregate on properties of natural and recycled aggregate concrete

The brick, stone, and construction industries produces huge quantities of non-biodegradable waste materials and incorporation of such waste materials in concrete eventually leads to the green and sustainable construction. The present paper study the effect of partial substitution of brick dust (BD), stone dust (SD), and recycled fine aggregate (RFA) as fine aggregate on the properties of natural aggregate concrete (NAC) and recycled aggregate concrete (RAC). In the present investigation, two groups of mixes were considered: Group A consists of 100% natural coarse aggregate (NCA) and group B consists of 50% NCA and 50% recycled coarse aggregate. In each group, the natural fine aggregate was partially replaced with 30% BD, 30% SD, and 30% RFA separately. All mixes were designed for M25 grade concrete with a constant w/c ratio of 0.45. The properties viz. compressive strength, density, indirect tensile strength, water absorption, ultrasonic pulse velocity of all mixes was performed. Also, durability performance of all the mixes under acid conditions viz.: HCl and H(2)SO(4)solutions were studied. From the results it was found that the compressive strength and split tensile strengths (27.95-23.23%) of both natural and recycled aggregate concrete were significantly increased with the partial substitution of SD. Also, the results reveal that the water absorption decreased by 57.14-69.64% and 4.67-34.67%, respectively, when the replacement of NFA with BD and SD in both NAC and RAC. Both natural and recycled aggregate concrete were more susceptible for H(2)SO(4)than HCl acid in terms of loss of weight and compressive strength.