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混凝土的早期抗拉性能是评价和预测混凝土结构早期开裂不可或缺的重要参数,但并未受到国内研究同行的重视。高性能混凝土较普通混凝土更易于发生早期开裂,故对其抗拉性能加以研究意义重大。本文通过自行设计的实验装置对高性能混凝土早龄期极限拉应变进行了试验研究。结果发现,高性能混凝土硬化期间极限拉应变极高,并随龄期迅速递减,达到最小值后又缓慢回升并渐趋稳定。基于试验结果和CEB-FIP MC 90对高性能混凝土的早期极限拉应变进行了初步评价。
Early tensile properties of concrete is an important parameter to evaluate and predict the early cracking of concrete structures, but it has not been paid much attention by domestic research counterparts. High-performance concrete is more prone to early cracking than ordinary concrete, so it is of great significance to study its tensile properties. In this paper, the experimental study of the ultimate tensile strain of high performance concrete at early age was conducted by means of a self-designed experimental device. The results show that the ultimate tensile strain of high performance concrete is extremely high and decreases rapidly with age, then reaches the minimum and then slowly rises and stabilizes. Based on the test results and CEB-FIP MC 90, the initial ultimate tensile strain of high performance concrete was preliminarily evaluated.