高强混凝土经轴压和硫酸盐侵蚀后的力学性能

发布时间：2018-03-13 14:45

本文选题：高强混凝土　切入点：硫酸盐腐蚀　出处：《长江科学院院报》2017年10期 　论文类型：期刊论文

【摘要】：对经历不同程度轴压荷载的高强混凝土试件(尺寸为100 mm×100 mm×300 mm)进行硫酸盐长期浸泡和干湿循环试验,并在180 d侵蚀后对其进行单轴压缩试验。分析不同侵蚀方式下,硫酸盐浓度大小及历史荷载水平对峰值应力、峰值应变、弹性模量、应力-应变曲线等的影响。结果表明:在相同历史荷载水平下,随着硫酸盐溶液浓度的增加,侵蚀方式是长期浸泡时,峰值应变先减小后增加,峰值应力、弹性模量则先增大后减小;而侵蚀方式是干湿循环条件时,随硫酸盐溶液浓度的增大,峰值应变持续增加,峰值应力、弹性模量则不断减小。在相同硫酸盐溶液浓度下,随着历史荷载的增大,长期浸泡及干湿循环侵蚀方式下,其峰值应变均增加,峰值应力及弹性模量均降低。引入叠加效应系数K来表征硫酸盐侵蚀与单轴历史荷载作用2个因素的联合交互作用,分析表明,荷载历史与硫酸盐腐蚀联合作用对混凝土的损伤起到相互促进的作用。
[Abstract]:To experience different degrees of axial load of high-strength concrete specimens (dimensions of 100 mm * 100 mm * 300 mm) for long-term sulfate immersion and dry wet cycle test and uniaxial compression test on the 180 d after erosion. Analysis of different erosion mode, sulfate concentration size and history load of horizontal stress. The peak strain, elastic modulus, impact stress-strain curve. The results show that: in the same historical load level, with the increase of sulfate concentration, the erosion is a long soak, the peak strain decreases first and then increases, the peak stress, elastic modulus increases first and then decreases; and the erosion is dry wet cycle condition, with the increase of sulfate concentration, the peak strain continued to increase, the peak stress and elastic modulus decrease. In the same sulfate solution concentration, with the historical load increasing, long soak and dry Circular erosion modes, the peak strain increased, peak stress and elastic modulus decrease. Combined interaction, introducing superposition effect coefficient K to characterize the sulfate erosion and uniaxial loading history of 2 factors analysis showed that the combined effect of loading history and sulfate corrosion to promote the interaction of concrete damage.

【作者单位】：烟台大学土木工程学院;
【基金】：国家自然科学基金项目(51479174)
【分类号】：TU528.31

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