对含活性矿物掺合料高强混凝土早龄期拉伸徐变特性的研究,能够为服役期高强混凝土的高精度应力解析及开裂预测提供重要参数.以0.3水胶比、50％ 矿渣掺量的高强混凝土为对象,利用本研究团队自行设计的早龄期拉伸基本徐变试验装置,对在不同加载应力强度比(0.2,0.3,0.4)和不同加载龄期(1,2,3,5,7d)情况下的混凝土早龄期拉伸徐变进行了试验研究.结果表明:2d及之后的加载龄期下不同应力强度比的比徐变经时变化曲线基本重合,比徐变表现出较明显的线性特征.加载龄期对于徐变的影响在3d之前加载时特别明显,7d及之后加载龄期对徐变基本无影响.%Investigation on the early-age tensile creep behavior of high strength concrete containing active mineral admixtures can provide the important parameters for high-precision stress analysis and crack prediction .In this paper ,the basic early-age tensile creep behavior of high strength concrete with 50％ blast furnace slag and 0 .3 water-binder ratio is studied experimentally .An early-age tensile basic creep testing apparatus designed by our research group is used and the effects of the stress/strength ratio (0 .2 ,0 .3 ,and 0 .4) and the loading age (1 ,2 , 3 ,5 ,and 7 days) on the behavior of basic tensile creep are discussed .The test results show that the creep curves with linear features are substantially coincident for different stress/strength ratios when the loading age is larger than or equal to two days .The effect of the loading age on creep is particularly pronounced when the loading age is smaller than three days but is negligibly small when the loading age is larger than seven days .
展开▼
