IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 01, 2015 | ISSN (online): 2321-0613 All rights reserved by www.ijsrd.com 745 Use of Silica Sand as Fine Material in Concrete J.V.Kerai 1 S.R. Vaniya 2 1,2 Department of Civil Engineering 1,2 DIET-RAJKOT Abstract— concrete made from silica sand as partial replacement of fine aggregate will be studied for workability, compressive strength, tensile strength, and modulus of elasticity. I will use silica sand as partial replacement of fine aggregate by different percentage for making concrete of grade M-20.. The percentage replacement will be 0%, 10%, 20%, 30%, 40%, 50%, 60%, & 70% with natural fine aggregate by its weight. I will prepare cubes, cylinders, beams and finally slump test, compressive strength test, splitting tensile strength test and flexural strength test will be conducted to obtain the necessary results. A large no. of trial mixes are required to select the desired optimum replacement of fine aggregate by silica sand. Key words: modulus of elasticity, compressive strength, tensile strength I. INTRODUCTION Each year thousands of tons of waste materials are disposed on the valuable land which results in the occupation and degradation of valuable land. Decreasing of natural resources is a common phenomenon in developing countries like India due to rapid urbanization & industrialization involving construction of infrastructures. Currently waste handling is big problem. Therefore, many investigations are carried out in order to utilize industrial, constructional and domestic waste for concrete mix. There are many investigations are carried out on the using of rubber of tyres, plastic waste, bottom ash, fly ash, copper slag, quarry dust, tiles waste, recycled aggregate, waste glass etc. A. Silica Sand: Silica sand is obtained from the raw material. After washing the raw material the silica sand is separated by sieve size 1.18 of raw material. Raw material is washed for taking out the clay material which is useful for making the tiles. In the raw material about 10% is clay which is supplied to the ceramic factories. From the raw material different size of silica sand are separated by different size of sieve. Sand size of 30 mesh to 80 mesh (500 micron) is used in the glass industries. Sand size 1.18mm to 600 micron can be used in making concrete mix as the partial replacement of fine aggregate. Nearly about 200 tones of silica sand is obtained daily after washing the raw material. Sometimes it is used in the glass factories otherwise they dump them back into the mines. Silica is the composition of silicon and oxygen. Silicon and oxygen are the earth‟s two most abundant elements. Silica is one of the earth‟s three most common rock forming material. Silica occurs in three main crystalline forms. It is a very durable material resistant to heat and chemical attack. The first industrial uses of crystalline silica were probably related to metallurgical and glass making activities a few thousand years BC. It is a key raw material in the industrial revolution especially in glass, foundry and ceramic industries. Now a day‟s silicon is used in information technology products like plastic of computer mouse and providing the raw material for silicon chips. For industrial pure deposits of silica sand capable of yielding products of at least 95% silica are required. B. Uses of Silica Sand:  Glass  Foundry casting  Ceramics  Filtration  Specialist building applications  Sports and leisure  Sand blasting and other abrasives.  Pigments Fig. 1: Silica sand C. Objective and Need of the Study:  Partially Replacement of fine aggregate with silica sand by volume.  To investigate the fresh and hardened properties (slump test, compressive strength, Tensile strength & Flexural strength) of concrete for M20-M30 grade of concrete mix.  To investigate the hardened properties of concrete made with partial replacement of fine material with silica sand  The properties of silica sand and silica sand concrete is examined and the use of silica sand in construction is tested.  Use of waste silica sand as the fine material in concrete can reduced the demand of natural sand. II. LITERATURE REVIEW A. Research Paper: 1) P. Aggarwal, Y. Aggarwal, S.M.Gupta, (2007): They had studied the effect of use bottom ash as a replacement of fine aggregate. The coarser material, which falls into furnace bottom in modern large thermal power plants and constitute about 20% of total ash content of the coal fed in the boilers. The various strength properties