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初始损伤对混凝土硫酸盐腐蚀劣化性能的影响

刘娟红 赵力 纪洪广

刘娟红, 赵力, 纪洪广. 初始损伤对混凝土硫酸盐腐蚀劣化性能的影响[J]. 工程科学学报, 2017, 39(8): 1278-1287. doi: 10.13374/j.issn2095-9389.2017.08.019
引用本文: 刘娟红, 赵力, 纪洪广. 初始损伤对混凝土硫酸盐腐蚀劣化性能的影响[J]. 工程科学学报, 2017, 39(8): 1278-1287. doi: 10.13374/j.issn2095-9389.2017.08.019
LIU Juan-hong, ZHAO Li, JI Hong-guang. Influence of initial damage on degradation and deterioration of concrete under sulfate attack[J]. Chinese Journal of Engineering, 2017, 39(8): 1278-1287. doi: 10.13374/j.issn2095-9389.2017.08.019
Citation: LIU Juan-hong, ZHAO Li, JI Hong-guang. Influence of initial damage on degradation and deterioration of concrete under sulfate attack[J]. Chinese Journal of Engineering, 2017, 39(8): 1278-1287. doi: 10.13374/j.issn2095-9389.2017.08.019

初始损伤对混凝土硫酸盐腐蚀劣化性能的影响

doi: 10.13374/j.issn2095-9389.2017.08.019
基金项目: 

国家自然科学基金资助项目(51678049)

国家重点研发计划资助项目(2016YFC0600800)

详细信息
  • 中图分类号: TU528.31

Influence of initial damage on degradation and deterioration of concrete under sulfate attack

  • 摘要: 通过试验研究含初始损伤混凝土在硫酸盐腐蚀和干湿循环共同作用下的性能,分析了不同初始损伤程度混凝土随腐蚀时间的增加,其质量、超声波传播速度、强度、单轴压缩应力应变曲线以及声发射活动的变化,运用损伤力学对腐蚀损伤进行定量评价和参数拟合,基于声发射特性建立含初始损伤混凝土的腐蚀受荷损伤模型并进一步分析其损伤演化过程,借助环境扫描电镜与电子能谱技术观测分析受硫酸盐腐蚀作用初始损伤混凝土微结构的变化,揭示其损伤机理.试验结果表明,随着腐蚀时间的增加,不同初始损伤程度混凝土的质量、超声波传播速度和强度均呈先增大后减小,初始损伤程度增加会加速混凝土在腐蚀作用下物理力学性能的劣化,其影响存在阈值,分别以抗压强度、超声波速为损伤变量可以建立混凝土的腐蚀损伤劣化方程,并进一步得出不同损伤表达式间的函数关系;相同腐蚀时间下,初始损伤的增加使声发射活动减弱且产生明显的声发射的时间滞后;初始损伤下,基于声发射特性的混凝土损伤演化过程可分为初期压密阶段、损伤稳定演化阶段和损伤加速发展阶段3个阶段;初始损伤的增加使混凝土内部腐蚀反应更为活跃,微裂纹网络体系比无初始损伤状态下更加发达,呈现龟裂状延伸和扩展,进而改变了混凝土的宏观物理力学性质.
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  • 收稿日期:  2016-10-20

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