There are many recent problems in several quarries of natural sand containing sulphate ratios outside the limits of the specification has led to difficulty in obtaining sand conforms to specifications in terms of the proportion of sulphate. To solve this problem, in this search was used the iron industry waste called slag iron that forming a burden on the environment. Where it was broken down and converted into a sand and then use the replacement rates (0, 25, 35, 50 and 100)% from a failing natural sand. Test conducted compressive strength and electrical resistivity to find out the impact of replaced the slag sand by failing natural sand on its. The results showed that the best replacement ratio was 50% by weight of failing sand and the rate of increase in the compressive strength (31.3 and 7)% at age 28 day compared mixture containing failing natural sand and the mixture containing the successful natural sand respectively. But when the total replacement of the failing sand by slag sand was the percentage increase (79.1 and 46) % compared to the same mixtures and age. The results of electrical resistivity tests showed significantly reduced for the mixtures which were the replacement the failing sand by slag sand with rates (0, 25, 35 , 50 and 100) % compared to the mixtures containing successful natural sand where the rate of decline at age 28 day (30.8, 52.7, 60.8, 64.8 and 86.2) % respectively.
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