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In this study, the influence of revibration on the compressive strength of retarded concrete is examined at late lag time intervals before and after the initial and final setting times. The time lag intervals ranged from about 2 hrs to 8 hrs and the retarder dosages of the used cement weight ranged from 0.5% to 1.5%. Results from this study indicate that the maximum compressive strength is achieved when the concrete is revibrated after 2 hrs 35 min with 0.5% of retarder dosage for any workability. Furthermore, higher dosages of the retarder do not reduce the compressive strength of the concrete when it is revibrated at late lag time intervals even near its final setting time. The use of setting retarder in high doses and revibration of the concrete reduces the air-voids in hardened concrete.

Effects of revibration on early age retarded concrete