IMPROVEMENT OF THE PROPERTIES OF PRECAST CONCRETE SURFACE BY USING THE WATER PERMEABILITY MOULD AND THE HORIZONTAL VIBRATION

Abstract

The sides and the upper-middle part of the sealed concavity mould were stuck by the water permeability sheets and compacted by using the horizontal vibration. This process can improve the compaction of the upper-middle part which can not gain the good compaction when uses the plywood mould. The voids on the surface of the hardened concrete were evaluated by using the equipment of void analyzer. The good compaction results were determined based on the results of void evaluation. The formula of acceleration and total work were used to give a numerical value to the relationship between the good compaction and the factors of horizontal vibration.