Abstract:
A huge amount of concrete is consumed by the construction industry. About 35% volume of concrete is comprised of sand. Now-a-days due to constant sand mining the natural sand is depleting. Sand dragging from river beds have led to several environmental issues. This research paper presents a study on replacement of natural sand in cement concrete by Manufactured sand at different percentages (i.e. 100%NS+ 0%MS; 75%NS+25%MS; 50%NS+50%MS; 25%NS+75%MS and 0%Ns+100%MS. The study investigated the workability, compressive strength and permeability characteristics of C25 concrete. For fresh concrete slump test was done from this test it was seen that as the manufactured proportion increases the workability decreases. For concrete with higher manufactured sand in order to get a workable concrete mix a super plasticizer admixture was used. Tests were carried out on 150cm*150cm*150cm cubes to study the compressive strength and impermeability properties of concrete using manufactured sand and compared with natural sand concrete. The results of the hardened properties of the mixes have shown that concrete mixes with partial proportions of manufactured and natural sand achieved a higher compressive strength than the natural sand. Note that the optimum compressive strength was seen between 50% and 75% replacement. The water impermeability test indicate that the penetration of water decreases as the
