抄録
The Purpose of this paper is to investigate the properties of concrete in the vacuum prepacked concrete. The following results were obtained : 1) By reducing pressure in the forms before injection, the void rates is extremely few and the compressive strength is higher comparing with the concrete injected under the atmospheric pressure. 2) The maximum compressive strength of produced concrete by this method exceeds 700kg/(cm)^2, while that of conventional prepacked concrete is about 500kg/(cm)^2. 3) The both ratios of Young's modulus and bond strength between deformed bars to compressive strength are higher than those by conventional method, while the other properties are similar. 4) By this method many kinds of coarse aggregates with unsuitable shape and surface such as blast furnaceslag gravel become useful.
