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The investigation aims to study the effect of re-vibration time and amount of steel fiber on the properties of concrete made with crushed cement-sand mortar as coarse aggregate. Three mixes were prepared with 0.00, 50 and 100 percent replacement of natural gravel by crushed cement-sand mortar aggregates. Mix proportions of concrete were 1: 2: 3 by weight. The water cement ratio of 0.50 to 0.60 was used to obtain the same workability for all mixes throughout the research. The specimens were cast to investigate compressive and splitting tensile strength of concrete. The results showed that concrete made of crushed cement-sand mortar as coarse aggregate had lower workability than concrete made with natural gravel aggregate for the same water cement ratio. This reduction in workability is reduced for the richer mixes and the influence of coarse aggregate on the workability decreases with an increase in the amount of cement in the mixture. Concrete compressive and splitting tensile strength were improved due to re-vibration by about 19 percent at the peak value (about one hour after initial vibration) with volume fraction of steel fiber of about 0.5 percent. The steel fibers improve the compressive strength of concrete by about 8-11 percent and the splitting tensile strength by about 10.3 percent for the same period of revibration.

EFFECT OF RE-VIBRATION TIME AND STEEL FIBER CONTENT ON THE PROPERTIES OF CRUSHED CEMENT-SAND MORTAR CONCRETE Dr.