Vibration of concrete during casting represents an important item in developing high quality concrete. The improvement of concrete quality is due to both compaction and consistency made by vibration. The effect of revibration on concrete needs to be studied. This paper presents the results of an experimental work carried out to study the effect of revibration on concrete quality. The variables included in this research program were the time at which the concrete had been revibrated, and the water cement ratio. The investigated properties were the compressive strength, the bond strength, and the density of the concrete. The compressive strength was measured by standard cubes (side length of 150 mm) and the bond strength was measured by pull out test using standard cylinders (150 mm diameter and 300 mm height) . The experimental results showed a general increase in compressive strength and bond strength in revibrated concrete. The maximum gain in compressive strength and bond strength was when the revibration occured at the initial setting time. Generally after the final setting time the revibration has insignificant effect on concrete. |
