• Yasir Karim
• Megha Cheema
• Neha Agarwal
• Pooja Gothwal
• Nirjhar Joshi

Concrete is one of the most important engineering material and the addition of some other materials may change the properties of concrete. With increase in trend towards the wider use of concrete for prestressed concrete and high rise buildings there is a growing demand of concrete with higher compressive strength. Mineral additions which are also known as mineral admixtures have been used with cements for many years. There are two types of materials crystalline and non-crystalline. Micro silica or silica fume is very fine non crystalline material. Silica fume is produced in electric arc furnace as a by-product of the production of elemental silicones or alloys containing silicon. It is usually a grey colored powder somewhat similar to Portland or some fly ashes silica fume is generally categorized as a supplementary cementitious material. Silica fume or micro silica was initially vied as cement replacement material and in some area it is usually used as replaced by much smaller quantity of silica fume micro silica may be used as pozzolanic admixtures. Admixture is defined as a material other than cement water and aggregate that is used as ingredient of concrete and is added to the batch immediately before or during mixing. Pozzolanic admixtures are siliceous or aluminous material which is themselves possess little or no cementitious value but will in finely divided form and in the presence of water chemically react with calcium hydroxide liberated on hydration at ordinary temperature to form compounds possessing cementitious properties. In our experiment we are going to use micro silica as an artificial pozzolans. We are going to add 0%, 5%, 10%, 15% by weight of cement in concrete.

Cementitious, Concrete, Crystalline, Micro silica, Pozzolanic admixtures, Strength

"EFFECT AND OPTIMISATION OF MICRO SILICA ON HIGH GRADE STRENGTH OF CONCRETE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.81-84, June 2019, Available :http://www.jetir.org/papers/JETIRDH06014.pdf

"EFFECT AND OPTIMISATION OF MICRO SILICA ON HIGH GRADE STRENGTH OF CONCRETE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp81-84, June 2019, Available at : http://www.jetir.org/papers/JETIRDH06014.pdf