| 摘要: |
| 在0.3%，0.5%，1.0%，2.0%预加拉伸应变破坏下，进行了2种配比、不同龄期的工程水泥基复合材料（ECC）的裂缝分布、干湿循环自愈合后力学性能的恢复及不同物相的纳米压痕测试.结果表明：ECC具有很多有利于裂缝自愈合行为的特性，其裂缝宽度大都在30μm以下，自愈合后，其最终强度及拉伸应变能力均能达到甚至超过对比试件，裂缝自愈合产物的弹性模量约为34.8GPa，硬度约为1.6GPa，刚度约为0.1mN/nm. |
| 关键词: 水泥基复合材料 自愈合 裂缝分布 纳米压痕 |
| DOI：10.3969/j.issn.10079629.2012.01.006 |
| 分类号: |
| 基金项目:美国国家自然科学基金资助项目（CMMI 0700219） |
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| Crack Distribution and Mechanical Performance of Self healing of Engineered Cementitious Composites（ECC） Materials |
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| Abstract: |
| Crack distribution, mechanical performance recovery of self healing engineered cementitious composites(ECC) materials under wet/dry conditioning cycles and nano identation analyses of the microphases in ECC at 0.3%, 0.5%, 1.0% and 2.0% pre loading were investigated. The results suggest that ECC has many characteristics that contribute to self healing behavior. Majority of ECC cracks are below 30 μm in width. Both ultimate tensile strength and tensile strain capacity of the majority specimens at reloading are higher than the control specimens. The modulus of elasticity, hardness and stiffness of healed products is about 34.8 GPa, 1.6 GPa and 0.1 mN/nm respectively. |
| Key words: engineered cementitious composites（ECC） self healing crack distribution nano indentation |
