硅酸盐学报

应力损伤轻骨料混凝土抗冻融性能试验研究

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焦作 454000

分类号：中图分类号：TU528

出版年,卷(期):页码：2014,42(10):0-0

DOI：

摘要：

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。

Abstract: The original stress damage of the pumice lightweight aggregate concrete was conducted through repeatedly stress loading enforcement, as well as the “quick frost method”. Herein, the relative dynamic modulus of elasticity and the mass loss rate were treated as the evaluation indicator. The anti-freeze-thaw performance of lightweight aggregate concrete was analyzed on the damage degrees of 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 the scanning electron microscope. Then, the influence mechanism of initial stress damage on the anti-freeze-thaw performance of lightweight aggregate concrete was investigated. Finally, through the analysis on the evolutionary process of freeze-thaw injured lightweight aggregate concrete, and based on 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 established. Results indicated: the existence of original stress damage can speed up the process of freeze-thaw damage of lightweight aggregate concrete. Besides, the larger of the original stress damage, the severer of the freeze-thaw one. The fitting values and experimental values of the mechanical damage evolution equation are consistent with each other, which can provide theoretical foundations for the damaged lightweight aggregate concrete associated anti-freeze-thaw performance forecast and, maintenance and reinforcement.

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项目(20130425)；内蒙古自治区自然科学基金项目（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，博士生导师，教授

参考文献：

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