高強度・超高強度コンクリートおよびコンファインドコンクリートの圧縮強度の変動に関する研究

Abstract

In this study, the variations of the compressive strength of high strength plain and confined concrete were examined, as a first step to establish a standard test method for the compressive strengh concrete. The following results were obtained from this experiments : 1) The compressive strength of concrete increased with the increase of confined ratio and yield point of lateral reinforced steel bar. This tendency was more significant as the decrease of compressive strength of concrete matrix. 2) In the case of compressive strength of concrete matrix (Fc)≧800kgf/(cm)^2,the compressive strengths of concrete were hardly affected by the difference of dryness of specimen. In the case of Fc=400kgf/(cm)^2,however, the compressive strengths of concrete in dry condition were higher than those in wet condtion. 3) The stochastic models for normal strength concrete proposed by the author were available to the high strength concrete. The theoretical predictions on the statistical distributions of concrete strength were in good agreement with the experimental results over a wide range. 4) The coefficient of variation of concrete strength decreased with the increase of the strength of concrete matrix, the confined ratio and yield point of lateral reinforced steel bar.