Development Of Mix Design Of Concrete By Adding Admixture With Resisting Sulphate Attack And Acid Attack

Abstract

This paper presents the result of mix design developed for high strength concrete with silica fume and High range water reducing admixture (HRWR). It involves the process of determining experimentally the most suitable concrete mixes in order to achieve the targeted mean strength. In this research work 53 grade ordinary Portland cement, the locally available river sand, 10 mm graded coarse aggregate were selected based on ASTM C 127 standard for determining the relative quantities and proportions for the grade of concrete M60. For this design ACI 211.4R-93 guidelines were followed. Totally 5 mixes were designed one mix was treated as basic mix with HRWR - 0.5% without silica fume, 4 mixes were designed with Micro silica quantities varied from 5 to 9 percent weight of cementations materials and

HRWR varies between 0.6% to 0.9%with increment of 0.1% . Each mix 2 numbers of 150mm x 300 mm cylinders were cast then kept in curing tank after 24 hours of time period. After 28 days of curing the specimens were tested and the appropriate mix proportions were obtained. The flow properties of resulting concrete is characterized in the  fresh state by methods used for Self compacting concrete, such as Slump-flow, V-funnel and L- box tests respectively. Further the durability properties are examined for High performance Concrete mix of grade M60. The durability factors are also studied The effect of Na₂So₄ on these mixes is nil where as HCL and H₂So₄  had substantial impact.