Importance Of Active Vibration On Concrete Quality

Quality of concrete is formed throughout different stages occurred within some determined time. One of the important factors affected the quality of the concrete is the stage in which the concrete is placed inside the forms as dense and uniform as possible. One of the important methods of placement of the concrete inside the forms is vibration. An experimental study has been carried out to emphasize known importance of the vibration. In this study, three groups of C20 and C35 class concrete mixtures were prepared. In group A, vibration was not used. In group B, vibration was applied when the concrete was placed and 30, 60 and 90 minutes after the concrete was placed. In group C, vibration was used only when concrete was poured into the forms. After the samples were cured at standard conditions, compressive strengths of the samples were found at 7 and 28 days. Then, the compressive strength of group B at 28 days was taken as reference strength and the strength of other samples were compared with the reference strength.