Sak reddy 3 studied the effect of fly ash on strength

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the increase in fly ash percentage for a given w/c ratio. S.A.K. Reddy [3] studied the effect of fly ash on strength and durability parameters of concrete and found that consistency increases greatly with increase in percentage of fly ash. The optimum 7 and 28 day compressive strength was obtained in the range of 20% fly ash replacement level. It also led to the increase in split tensile strength of concrete. Tarun Sama [4] studied the effect of strength of concrete by partial replacement of cement with fly ash and addition of steel fibres. The grade of concrete used was M40 with mix proportion of 1:1.62:2.83 and w/c ratio of 0.45. It was observed that the optimum percentage of adding fly ash and steel fibres was determined to be 40% and 2% which showed the maximum improvement in tensile and flexural strength. Shantmurti Upadhyaya [5] studied the effects of fly ash on compressive strength of M20 mix design concrete and found that till the addition of fly ash upto 10%, there is negligible change in the strength of concrete. It was also observed that at the replacement till 30%, fly ash blocks have shown very low compressive strength in comparison to concrete containing no fly ash. Blocks containing fly ash were lighter in weight than the concrete block containg no fly ash. P.R. Wankhede [6] studied the effect of fly ash on properties on concrete and found that slump loss of concrete increases with increase in w/c ratio of concrete and increase in quantity of fly ash. It was also concluded that concrete with 10% and 20% replacement of cement with fly ash shows good compressive strength for 28 days than normal concrete, but in case of 30% replacement of cement with fly ash ultimate compressive strength of concrete decreases. Rahul Bansal [7] studied the effect on compressive strength with partial replacement of fly ash and found that by 10% replacement of cement by fly ash, 20% and 50% decrease in compressive strength was observed at the age of 7 and 28 days respectively. At 20% replacement, 7% and 11% increase in compressive strength was observed at the age of 7 and 28 days respectively. In 30% replacement, 23% and 25% increase in compressive strength was observed at the age of 7 and 28 days respectively. It was also observed that with the increase in age the compressive strength also increased for fly ash replaced concrete. 3. MATERIAL USED The physical properties of cement, fine aggregates, coarse aggregates, fly ash and water used for mix design of M20 grade of concrete were tested in laboratory and are mentioned below. 3.1. Cement The cement used was OPC53. All properties of cement were in accordance with IS269:1976. The physical properties of the cement used are as listed in table below. Table-1: Physical Properties of Ordinary Portland Cement Properties Test Values Specific Gravity 30% Consistency (%) 3.15 Initial Setting Time 60 min.
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