MECHANICAL, DURABILITY PROPERTIES AND SEM ANALYSIS ON HIGH STRENGTH SELF COMPACTING CONCRETE USING SILICA FUME AND QUARRY DUST
High strength self compacting concrete is a fluid mixture suitable for congested reinforcement. It should posses a good balance between the deformability and suitability. This is being used in increasing volume in recent years due to its mechanical properties and durability properties than conventional concrete. In this paper the High strength self compacting concrete with different minerals used and their performances were presented. By adding admixtures like silica fume, and quarry dust will decrease the flow ability, to improve this super plasticizers were added. The successful utilization of silica fume and quarry dust could turn this waste material into valuable resources. As per EFNARC guidelines the fresh concrete properties of the trial mixes checked and the one which gives the maximum strength has been used in the present work. Slump flow, V-funnel, U-Box L-Box tests are checked against the specifications given by EFNARC guidelines for qualifying self compacting properties. This project presents the results of mechanical and durability properties of high strength self compacting concrete (HSSCC) with silica fume, quarry dust and super plasticizer. Thus, the improvement in durability properties of a concrete mix having partial replacement Silica Fume (SF) of 20% and Quarry Dust (QD) of 20% was found to be the best. SEM Analysis was done for normal concrete and HSSCC samples and it was displaying silica fume and quarry dust formation with concrete gives non porous medium and arrest the cracks. Also it resists the water and air environment and improves the strength. Keywords— High strength self compacting concrete; silica fume; quarry dust; super plasticizer; mechanical properties; durability properties I. INTRODUCTION Self Compacting Concrete (SCC) is a concrete, in fresh state that has excellent deformability and high resistance to segregation and without applying vibration it can be placed and compacted under its self weight. The elimination of vibration reduces the cost and improves the work environment. Due to intrinsic low porosity, SCC usually has high performance properties in terms of mechanical behavior and durability. To get more strength the silica fume and quarry dust were added. With proper use of super plasticizers, SCC could achieve higher flow ability and higher slump without segregation, it makes concrete more durable. The purpose of High strength self compacting concrete is one of the most important development in the building industry. The purpose of using this concrete is to decrease the human risk. The properties of high strength self compacting concrete differ from conventional concrete. It is possible to improve the mechanical properties of concrete by using chemical, mineral additives. The industrial by-products, such as Silica Fume (SF), Quarry Dust (QD) offers a low priced solution to the environmental problem of depositing industrial waste. Silica Fume is usually categorized as a supplementary cementitious material. It has excellent pozzolanic properties. If we add quarry dust to normal concrete, it makes the concrete as high fineness. The addition of quarry dust to fresh concrete increases the water demand and consequently the cement content forgiven workability and strength requirement however potential benefits to using quarry dust is cost saving because material cost varying depends upon the source.