蒋永祥,王跃,马耀举,于蕾,韩春绪

• 1:中交投资有限公司
• 2:北京新桥技术发展有限公司

摘要(Abstract)：

通过开展干湿循环作用下高韧性水泥基材料(High Toughness Cementitious Composites, HTCC)的单轴压缩试验，同步实施加载过程中的超声脉冲测试，关注不同侵蚀龄期下的应力-应变关系及相应的波速发展规律。结果表明：侵蚀早期，HTCC的初始纵波与横波波速变化均不大；硫酸盐干湿循环环境的劣化作用在120 d后开始显现，导致波速降低约25%。随着侵蚀周期延长，加载过程中的纵波波速逐步表现出压密特征，且波速在下降段中的降幅显著减小。而侵蚀早期的HTCC在加载中均表现出明显的横波波速陡降，但其陡降程度随侵蚀周期的增长而趋于缓和，材料受压破坏模式逐步由非稳态向稳态转化。超声脉冲法可有效识别HTCC的应力损伤演化，表征HTCC在硫酸盐侵蚀环境下的受力破坏模式。

关键词(KeyWords)： 高韧性水泥基材料;干湿循环;硫酸盐;损伤;超声波

Abstract:

Keywords:

基金项目(Foundation): 交通运输部公路科学研究所交通强国建设项目(JTQG20212393);; 北京新桥技术发展有限公司科技创新专项(BXQ2021096)

作者(Author): 蒋永祥,王跃,马耀举,于蕾,韩春绪

DOI: 10.13928/j.cnki.wrahe.2022.12.014

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