| 摘要: |
| 为研究初始应力损伤对混凝土抗冻融性能的影响，通过实验室快速冻融试验，以相对动弹性模量和质量变化率作为评价指标，分别研究了C30基准混凝土和损伤度为0～0.1，0.1～0.2，02～0.3的应力损伤混凝土抗冻融性能.结果表明：与基准混凝土相比，应力损伤混凝土抗冻融性能劣化.当损伤度小于0.1时，初始应力损伤对混凝土抗冻融性能影响不明显，可忽略损伤对其影响；当损伤度超过0.1后，初始应力损伤对混凝土抗冻融性能影响显著.通过对混凝土冻融损伤演化过程的分析，建立了包含应力损伤和冻融损伤的混凝土力学损伤演化方程. |
| 关键词: 混凝土 损伤度 冻融循环 相对动弹性模量 损伤演化方程 |
| DOI：10.3969/j.issn.1007 9629.2013.02.026 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51078322);河北省自然科学基金资助项目(E2011203218) |
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| Influence of Mechanical Damage on Frost Resistance of Concrete |
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ZHAO Qing xin, KANG Pei pei
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Key Laboratory of Mechanical Reliability for Heavy Equipments and Large Structures of Hebei Province,Yanshan University, Qinhuangdao 066004, China
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| Abstract: |
| The concrete of different initial stress damage degrees including 00.1, 0.10.2 and 0.203(by both rate of mass loss and relative dynamic modulus of elasticity）, was investigated by adopting quick freeze thaw experiments in laboratory along with control concrete for C30 in order to study the influence of initial stress damage on concrete properties subjected to freeze thaw cycles. Experimental results show that the freeze thaw resistance of stress damaged concrete gets poor compared with the control. The initial stress damage within 0 to 0.1 has only little effect on concrete performance, which can be ignored; however, the initial stress damage exceeding by 0.1 has a significant effect on concrete performance. Also, with the analysis of freeze thaw damage evolution process, the mechanical damage evolution equation including both stress damage and freeze thaw damage of concrete is established. |
| Key words: concrete damage degree freeze thaw cycle relative dynamic modulus of elasticity damage evolution equation |
