Authors:Â Rathan K. A, Ravikumar B. S
Abstract:Â This paper is on recycling and reusing the aggregates obtained from construction and demolition waste to make fresh concrete, and still ensuring that it possesses equal strength and durability as the concrete prepared by using fresh natural aggregate. Using recycled coarse aggregate in concrete helps in environmental protection and it is economical too. Moreover, recycled aggregates are the materials for the future. Fly ash is also a byproduct from various industries; it is also a group of materials which can vary significantly in its composition. In this task, the main purpose is to evaluate the physical properties of recycled coarse aggregate and fly ash for M45 grade of concrete combined in this proportion: 1:1.68:2.79. In the tests, the percentages of replaced virgin aggregate were 25%, 30%, 35%, 40% of recycle coarse aggregate and replaced cement was 0%, 10%, 20% of fly ash in concrete. The water cement ratio was taken as 0.4 with super plasticizer of 0.75% by weight of cement for M45 grade of concrete. Slump cone test was conducted to determine the workability property of fresh concrete and compressive, flexural and split tensile strength was conducted to evaluate the hardened properties of concrete. Modulus of elasticity was also presented for different mixes. The results show that recycled aggregate can be used up to 30% with 10% of fly ash for making concrete.
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