加载速率对湿态混凝土强度的影响

发布时间：2018-04-02 11:07

  本文选题：水工混凝土　切入点：加载速率　出处：《建筑材料学报》2017年04期

【摘要】：首先研究了混凝土在自由吸水条件下的饱和度演化规律,然后对5种湿度状态下的混凝土进行了5种抗压加载速率下的单轴压缩试验和5种劈裂抗拉加载速率下的劈裂抗拉试验,最后建立了不同饱和度混凝土的抗压强度、劈裂抗拉强度随加载速率变化的预测公式,并分解了自由水与加载速率的独立效应.结果表明:相同加载速率下混凝土试件的抗压强度与劈裂抗拉强度均随饱和度的增加而降低;相同饱和度下混凝土试件的抗压强度与劈裂抗拉强度均随加载速率的提高呈近似指数关系增长;相同饱和度下混凝土劈裂抗拉强度随加载速率的变化幅度较抗压强度更为显著.
[Abstract]:Firstly, the saturation evolution of concrete under the condition of free water absorption is studied.Then the uniaxial compression tests under five different compression loading rates and the splitting tensile tests under five splitting tensile loading rates are carried out on concrete under five different humidity conditions. Finally, the compressive strength of concrete with different saturation is established.The formula for predicting the variation of splitting tensile strength with loading rate is given, and the independent effect of free water and loading rate is decomposed.The results show that the compressive strength and splitting tensile strength of concrete specimens decrease with the increase of saturation at the same loading rate.Under the same saturation, the compressive strength and the splitting tensile strength of concrete specimens increase exponentially with the increase of loading rate, and the variation range of the splitting tensile strength of concrete with loading rate is more obvious than that of compressive strength under the same saturation.
【作者单位】： 西北农林科技大学水利与建筑工程学院;
【基金】：国家自然科学基金资助项目(51379178,50779057) 中央高校基本科研业务费专项资金资助项目(ZD2012015)
【分类号】：TU528

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