Compared Research on Elastic Modulus Strength between Manufactured Sand Concrete and Ordinary Concrete

Now, the resource of high quality natural sand is lacking. Manufactured sand is broken by rocks or tailings, which could be used in the mixture of cement concrete as fine aggregate instead of natural sand. The use of manufactured sand in concrete structure has become more and more important. It can make construction industry develop with environmentally friendliness and sustainability. In this paper, the elastic modulus strength was compared between manufactured sand concrete and ordinary concrete by testing on concrete specimens using the manufactured sand, the replacement ratios of manufactured sand by mass to the natural sand are 0, 0.30, 0.5, 0.70 and 1.0 respectively. The experimental research showed that the elastic modulus strength of manufactured sand concrete was stronger than that of natural sand and it had an increasing trend with the increasing of replacement rate and age but the elastic modulus of replacement rate of 50% was largest. This showed that the optimum replacement ratio was 50%. The fitting relations between elastic modulus and compressive strength was different with that of ordinary concrete. The relationship equation between elastic modulus strength and compressive strength of manufactured sand concrete was recommended in this paper. This could be used as a reference for the applications of the concrete using the manufactured sand as a fine aggregate in engineering.