论文部分内容阅读
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.
The research on tensile creep characteristics of high strength concrete containing active mineral admixtures at early age can provide important parameters for high precision stress analysis and cracking prediction of high strength concrete during service.With 0.3% of water and cement and 50% of slag content High-strength concrete as the object, the use of the research team designed their own early age tensile basic creep test device, at different loading stress intensity ratio (0.2,0.3,0.4) and different loading age (1,2,3,5 , 7d), the results show that the curves of specific stress-strain ratio under different load-bearing stress ratios at 2d and later time basically coincide with each other, The obvious linear characteristic is that the effect of loading age on creep is especially obvious when it is loaded before 3d, and the loading age after 7d and after has little effect on creep.