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应力损伤轻骨料混凝土抗冻融性能
作者:高 矗1  申向东1  王萧萧1  张 通1  代少华2 
单位:1.内蒙古农业大学水利与土木建筑工程学院 呼和浩特010018  2.河南理工大学安全科学与工程学院 河南焦作454000 
关键词:应力损伤 轻骨料混凝土 冻融损伤 损伤演化方程 
分类号:TU528
出版年,卷(期):页码:2014,42(10):1247-1252
DOI:DOI: 10.7521/j.issn.0454-5648.2014.10.06
摘要:

 通过反复加载对浮石轻骨料混凝土预制初始应力损伤,采用“快冻法”,以相对动弹性模量和质量损失率为评价指标,研究损伤度分别为0、0.05、0.12、0.19、0.27的轻骨料混凝土抗冻融性能。借助扫描电子显微镜分析冻融后应力损伤轻骨料混凝土的微结构特征,探讨初始应力损伤对轻骨料混凝土抗冻融性能的影响机理。最后,通过对轻骨料混凝土冻融损伤演化过程的分析,以Loland混凝土损伤模型为基础建立包含初始应力损伤和冻融损伤的轻骨料混凝土力学损伤演化方程。结果表明:初始应力损伤的存在会加速轻骨料混凝土冻融损伤的发展,且初始应力损伤越大,冻融损伤越严重;力学损伤演化方程拟合值和试验值吻合良好,可为灾变后轻骨料混凝土的抗冻融性能预测及维护加固提供理论依据。

 
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 The original stress damage of the pumice lightweight aggregate concrete was examined via repeatedly stress loading enforcement and the "quick frost method". The relative dynamic modulus of elasticity and the mass loss rate were used as evaluation indicators. The anti-freeze-thaw performance of lightweight aggregate concrete was analyzed at various damage degrees (i.e., 0, 0.05, 0.12, 0.19 and 0.27). The micro-structure characteristics of stress damaged lightweight aggregate concrete after the freeze-thaw procedure were analyzed by scanning electron microscopy. The influence of initial stress damage on the anti-freeze-thaw performance of lightweight aggregate concrete was investigated. Based on the analysis on the evolutionary process of freeze-thaw injured lightweight aggregate concrete and the concrete damage model of Loland, the original stress damage and the freeze-thaw damage involved mechanical damage evolution equation of lightweight aggregate concrete was proposed. The results indicate that the existence of original stress damage can accelerate the process of freeze-thaw damage of lightweight aggregate concrete. Besides, the greater the original stress damage, the severer freeze-thaw one will be. The fitting data by the mechanical damage evolution equation are consistent with the experimental results providing a prediction basis for the anti-freeze-thaw performance forecast, maintenance and reinforcement of the damaged lightweight aggregate concrete.

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基金项目:
基金项目:内蒙古自治区应用与研究开发科技计划(20130425);内蒙古自治区自然科学基金(2013MS0720);“十二五”农村领域国家科技计划课题(2011BAD29B03);高等学校博士学科点专项科研基金(20121515110002);内蒙古自治区2013年博士研究生科研创新项目(B20131012904Z)。
作者简介:
第一作者:高 矗(1988—),男,硕士研究生。 通信作者:申向东(1955—),男,教授。
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参考文献:

 参考文献:

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