Improvement of Surface Condition for Slab Concrete

Part 9. Counter-measures for degradation of vacuum pressure in 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 degradation of the magnitude of vacuum pressure has been examined and discussion has been carried out on the counter-measures to keep the vacuum pressure in site.