Study on strength and durability of self compacting concrete by adding nanosilica and microsilica

Abstract

Concrete is the only building material that acts as a backbone to the newlineconstruction sectors. One metric ton of cement produced emits one metric ton newlineof carbon dioxide, which is very harmful to the environment. One of the ways newlineto overcome this problem is to reduce the usage of cement. The performance newlineof cement could be replaced by many mineral admixtures. Many kinds of newlineresearch are being carried out to find a better substitute for cement. As of newlinenow, only partial replacement of cement is made through different materials newlinelike fly ash, silica fume, limestone powder, granulated ground blast furnace newlineslag and rice husk ash at different percentages. Presently, the adoption of self-compacting concrete has made concreting easier and quicker for all types of construction activities. The three major characteristics like filling ability, passing ability and resistance to newlinesegregation add credit to self-compacting concrete than other types of special newlineconcrete. The mix design is prepared by proportioning the aggregate ratio and newlineconducting a check for workability. A number of trials are required to achieve newlinethe workability along with SP and VMA dosage. A highly flowable and easily newlineworkable self-compacting concrete can be attained through proper mix newlinedesign. In this study, materials like microsilica, nanosilica and steel fibres newlinewere used for M40 SCC and in addition to this, fly ash was used in M60 newlinegrades of SCC. newline newline