Influence of crushed rock powder and fly ash on strength characteristics of concrete

摘要

The purpose of this research is to study the properties of fresh and hardened states of M35 gradernof concrete, using Crushed ROCK Powder (CRP) as fine aggregate to replace partial or full amount of sand withrnconstant addition of 35% Fly ash to existing cement content. This paper investigates quantitavely the strengthrnof concrete mix at different ages. The concrete contains 0%, 20%, 40%, 60%, 80% and 100% of crushed RockrnPowder as part of fine aggregate. The overall test results revealed that in concrete mixtures, Crushed RockrnPowder can be fully substituted as an alternative material for natural sand (fine aggregate) in presence of flyrnash. These findings guide the practitioner in selecting fly ash and Crushed Rock Powder contents to meet thernstrength and workability requirements in a concrete mix. The concurrent use of two byproducts will lead to arnrange of economic and environmental benefits.