| 摘要: |
| 针对干湿循环作用下高延性水泥基材料（ECC）的硫酸盐侵蚀问题,开展了不同侵蚀周期下ECC小尺寸圆柱体试件的单轴压缩试验,从轴压应力应变曲线、轴压强度、峰值应变、弹性模量和泊松比等多重力学指标的角度研究了受蚀ECC的轴压力学行为.结果表明：侵蚀初期的材料峰值轴向应变逐渐提高,侵蚀后期小幅降低,而径向应变呈先减小后增大趋势;硫酸盐干湿循环作用不会对ECC压应力应变曲线的初始线性段产生影响,而对曲线的非线性上升段和应力下降段影响显著;随侵蚀周期延长,ECC抗压强度大幅提高,但基材强度未见明显增长;应力下降段中,受侵蚀ECC的应力陡降特征明显区别于侵蚀前ECC的平缓下降;在本文研究的周期范围内,未见硫酸盐侵蚀对ECC弹性模量和泊松比的劣化作用. |
| 关键词: 延性水泥基材料 干湿循环 硫酸盐 轴压 |
| DOI：103969/j.issn.1007 9629202004016 |
| 分类号: |
| 基金项目:国家重点研发计划（2016YFC0701003）;国家自然科学基金资助项目（51808545）;北京市自然科学基金资助项目（8184083）;中国京冶工程技术有限公司国家认定企业技术中心开放基金项目（JZA2017Kj01） |
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| Uniaxial Compressive Behavior of ECC under Sulfate Erosion in Drying Wetting Cycles |
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HAN Yudong1, LIU Chang2, WANG Zhenbo2, ZUO Jianping2, HONG Zijie2
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1.China Jingye Engineering Co., Ltd., Beijing 100088, China;2.School of Mechanics and Civil Engineering, China University of Mining and TechnologyBeijing, Beijing 100083, China
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| Abstract: |
| Focusing the sulfate attack problem of engineered cementitious composites(ECC) under drying wetting cycles, uniaxial compression test on small cylindrical specimens after different erosion cycles were carried out. And the uniaxial compressive behavior of eroded ECC was investigated from the perspective of multiple mechanical indexes such as compressive stress strain curve, compressive strength, peak strain, elastic modulus and Poissons ratio. The results show that the peak axial strain of material increases gradually in the early stage of erosion, and it decreases slightly in the later stage of erosion, while the radial strain decreases first and then increases. Sulfate erosion in drying wetting cycle has no effect on the initial linear segment of the ECC compressive stress strain curve, but has a significant impact on the nonlinear ascending and stress falling segment. With the extension of erosion cycle, the compressive strength of ECC experiences an obvious increase, while that of the matrix stays almost unchanged. In the period of stress decline, the characteristic of stress drop of ECC is obviously different from that of ECC without erosion. In the cycles range of this study, the degradation of ECC elastic modulus and Poissons ratio by sulfate erosion is not observed. |
| Key words: ductile cementitious material drying wetting cycle sulfate uniaxial compression |
