混凝土冻融破坏机理及寿命预测方法  

Freeze-Thaw Failure Mechanisms and Service Life Prediction Methods of Concrete

作　　者：董昊良 李化建 杨志强 温家馨 黄法礼 王振 易忠来 DONG Haoliang;LI Huajian;YANG Zhiqiang;WEN Jiaxin;HUANG Fali;WANG Zhen;YI Zhonglai(China Academy of Railway Science Corporation Limited,Beijing 100081,China;Graduate School,China Academy of Railway Sciences,Beijing 100081,China;State Key Laboratory Track Technology of High-speed Railway,China Academy of Railway Science Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司,北京100081 [2]中国铁道科学研究院研究生部,北京100081 [3]中国铁道科学研究院集团有限公司高速铁路轨道技术国家重点实验室,北京100081

出　　处：《材料导报》2024年第2期139-149,共11页Materials Reports

基　　金：国家自然科学基金(U1934206);铁科院院基金(2021WR002);腾讯基金会科学探索奖。

摘　　要：冻融破坏是我国严寒或寒冷地区混凝土的主要破坏形式,分析混凝土的冻融破坏过程、明确混凝土的冻融破坏机理、提出混凝土冻融损伤寿命预测方法对混凝土结构耐久性设计至关重要。本文根据混凝土结构的冻融破坏特点,从整体水冻和表面盐冻两方面阐述了混凝土的冻融破坏机理,论述了冻融破坏机理在不同混凝土结构中的适用性,分析了高原低气压地区混凝土冻融破坏更加严重且引起困难的原因;系统总结了基于试验数据和数值模拟的混凝土冻融损伤寿命预测方法,分析了两种寿命预测方法的优势和不足,以期为寒区混凝土的抗冻性设计提供参考。Freeze-thaw failure is the main damage mechanism for concrete in cold regions.Revealing the freeze-thaw damage process and damage mechanism,and proposing the service life prediction method of concrete exposed to freeze thaw cycles are of great significance.In this paper,the freeze-thaw damage mechanism of concrete is reviewed in terms of water freezing and salt freezing according to the damage characteristics.Then,the freeze-thaw damage mechanism of concrete in plateau region and the influence of low air pressure on the damage of concrete are analyzed.The service life prediction of concrete in freeze-thaw environment is summarized by means of experimental study and numerical simulation.The pros and cons of the two life prediction methods are discussed,aiming to provide some references for the design of concrete structure in cold regions.

关 键 词：混凝土 冻融破坏机理 高原低气压 寿命预测 

分 类 号：TU528[建筑科学—建筑技术科学]