© 2019 IJRAR January 2019, Volume 6, Issue 1 www.ijrar.org (E-ISSN 2348-1269, P- ISSN 2349-5138) IJRAR1BLP086 International Journal of Research and Analytical Reviews (IJRAR) www.ijrar.org 560 ABSTRACT The paper presents a review on the role of silica fumes in concrete based mainly on the experience of the author and that of his colleagues. A significant amount of work has been carried out on silica fume and its uses in concrete, both from a research and field perspective. Recently there has been a great demand for high quality concrete and concrete structures with high performance. In this context, silica fume is one of the most remarkable mineral admixtures that can give high workability, strength and durability. However, it is unclear as to type of form silica fume take in concrete, mortar and cement paste. Some researchers point out that silica fume may be in high agglomeration. Therefore, it is very important to disperse silica fume in concrete effectively to get high performance concrete. Consequently, this paper deals with the effect of physical and chemical treatment of silica fumes on properties of cement mortar Use of Silica Fume in Concrete: A Review Inbisat Ahmad Shah 1 ,Research scholar, Lovely Professional University Geeta Mehta 2 , Assistant professor, , Lovely Professional University Key words: Silica fume, concrete,agglomeration, workability, strength, durability. Intoduction The first testing of silica fume in Portland cement- based concrete was carried out in 1952. The American Concrete Institute defines silica fume as “Very fine non crystalline silica produced in electric arc furnaces of the production of elemental silicon or alloys containing silicon”. It is usually a gray colored powder, somewhat similar to portland cement or some fly ashes. Silica fume is a byproduct of smelting process in the silicon and ferrosilicon industry [2]. In recent years siginificant attention has been given in reasearch application to the use of condensed silic fume as concrete property- enhancing material partial replacement for portland cement. The initial interest in theuse of condensed silica fume was mainly caused by the strict enforcement of air pollution control measures in various countries to stop release of material into the atmosphere. It is also known as micro silica, condensed silica fume, volatilzed silica or silica dust. These metals are used in many industrial application to include aluminium and steel production, computer chip fabrication and production of silicones, which used in lubricants and sealants. Silica fume consists of very fine vitreous particle with a minimum surface area is 15000 m^2/kg. The mean particle size of silica fume is between 0.1 and 0.2 micron. Its particle are apporximatelyv 100 times smaller than the avarage cement particles. Because of its extreme fineness and high silica content, silica fume is a highly effective pozzolanic material. Silica fume is used in concerte to improve its properties.