Effect of using water supply excess sludge, ground sand and fly ash to partially replaced portland cement on compressive strength, tensile strength and autogenous and drying shrinkage of concrete
Abstract:
The research objectives were to study the effects of using water supply excess sludge, ground sand and fly Ash to partially replace Portland cement type I on the compressive strength and direct tensile test at the age of 7, 28, and 60 days, and on the drying shrinkage and autogenous shrinkage of the concrete. Water supply excess sludge, ground sand and fly Ash were used to replace Portland cement in the ratios of 10 and 20 percent of the binder by using the replacement materials that were the same size as the cement in order to reduce the effects of particle sizes.
The researcher performed a test of compressive strength of the sample size of 15 X 15 X 15 cm and direct tensile at age of 7, 28 and 60 days. Both the drying shrinkage and the autogenous shrinkage were tested by using the sample size of 7.5 x 7.5 x 28.5 cm.
The results revealed that the value of compressive strength of concrete and that of the direct tensile using water supply excess sludge was lower than that of normal concrete in terms of both compressive strength and direct tensile based on the replacement of water supply excess sludge at the rate of 20 percent, which had less value than the replacement of tensile strength at the rate of 10 percent now that the replacement of cement with water supply excess sludge was increased. The more value of drying shrinkage, the more replacement of water supply excess sludge.