Improvement of Surface Condition for Slab Concrete

Part 8. Influence of strong sunshine in summer for vacuum processing

Abstract

It has been reported that vacuum processing is quite effective to obtain high density of concrete. The method, however, has not been successfully used for the concrete work in the field of building construction, compared with that of civil engineering works in Japan. In the present study, in order to clarify the best way to improve the usual vacuum processing method in the building construction work, a series of experiment is carried out. In this paper, the effect of the strong sunshine in summer has been examined and discussion has been carried out on the realized magnitude of vacuum pressure, evacuated amount of mixed water, and strength distribution inside concrete slabs.