EFFECT OF STONE DUST AND FINES ON THE PROPERTIES OF HIGH STRENGTH SELF COMPACTING CONCRETE

Self-compacting concrete (SCC) represents a milestone in concrete research. SCC is a highly flow-able, non-segregating concrete that can spread in to place, fill the formwork and encapsulate the reinforcement without any mechanical vibration for consolidation. SCC was originally developed at the University of Tokyo, Japan during the year 1986 by Prof. Okamura and his team to improve the quality of construction and also to overcome the problems of defective workmanship. Concrete technology has made significant advances in recent years which results in economical improvement of the strength of concrete. This economical development depends upon the intelligent use of the locally available materials. Important constituent of self-compacting concrete (SCC) is natural sand and filler material which is expensive and scarce. This necessitates that a suitable substitute be found. The cheapest substitute for natural sand is quarry dust and for filler material is fly ash. Quarry dust, a by-product from the crushing process during quarrying activities is one of the materials being studied and fly ash is an artificial pozzolanic material, a finely divided pozzolana form compounds which have cementitious properties, when mixed with hydrated lime and alkalis. In this work, the fresh and compressive strength properties of self compacting concrete when the sand is partially replaced with stone dust , when the filler materials is increased by adding fly ash in % of the total powder content and when both substituent's are implemented simultaneously . Optimization of stone dust and fly ash is also obtained. The results indicated that the incorporation of quarry dust into the self compacting Concrete mix as partial replacement material to natural sand resulted in higher compressive strength and optimization of sand replacement is 40%. Optimization of addition of fly ash in total powder content is 30%.