高寒区混凝土多场耦合损伤劣化机制研究进展
Research Progress on Multi-Field Coupling Damage Deterioration Mechanism of Concrete in Alpine Region
张维东 1汪愿 2宋鹏飞 2王亚坤 3刘倩倩 2王旭昊2
作者信息
- 1. 甘肃路桥第三公路工程有限责任公司,兰州 730000
- 2. 长安大学公路学院,西安 710064
- 3. 长安大学公路学院,西安 710064;海南省交通规划勘察设计研究院有限公司,海口 570100
- 折叠
摘要
高寒区混凝土结构在实际服役过程中不仅受到车辆荷载的作用,同时还受到盐蚀和冻融等环境因素的作用.在荷载、盐蚀及冻融等多场耦合的作用下,高寒区混凝土的劣化涉及到化学、物理和力学等多种作用的交互影响.氯盐与混凝土之间发生复杂的化学反应生成膨胀性复盐,导致混凝土内部体积膨胀,产生化学损伤.与此同时,冻融循环和动态荷载会造成混凝土物理损伤,在化学损伤和物理损伤的耦合作用下混凝土会迅速劣化.本文综述了盐蚀、冻融循环和动态荷载多场耦合对混凝土性能影响的研究现状,并总结了本领域最先进的材料无损表征技术和建模手段,从宏、细、微观多尺度建立兼具物理、化学损伤特性参数的预测模型,形成混凝土在多场耦合下的损伤劣化机制和劣化行为预测模型,最后提出了目前研究的不足之处.
Abstract
In the actual service process,the concrete structure in alpine region is not only affected by vehicle load,but also by environmental factors such as salt corrosion and freeze-thaw.Under the action of multi-field coupling such as load,salt corrosion and freeze-thaw,the deterioration of concrete in alpine region involves the interaction of chemical,physical and mechanical effects.The complex chemical reaction between chloride salt and concrete produces expansive double salt,which leads to internal volume expansion of concrete and chemical damage.At the same time,freeze-thaw cycles and dynamic loads cause physical damage to concrete,and concrete deteriorates rapidly under the coupling of chemical damage and physical damage.In this paper,the research status of the influence of salt corrosion,freeze-thaw cycle and dynamic load multi-field coupling on the performance of concrete is reviewed,and the most advanced material non-destructive characterization techniques and modeling methods in this field are summarized.The prediction model of physical and chemical damage characteristic parameters is established from macro,fine and micro scales,and the damage degradation mechanism and degradation behavior prediction model of concrete under multi-field coupling are formed.Finally,the shortcomings of the current research are put forward.
关键词
高寒区混凝土路面/劣化机制/耦合作用/预测模型/耐久性/力学性能Key words
concrete pavement in alpine region/deterioration mechanism/coupling effect/prediction model/durability/mechanical property引用本文复制引用
基金项目
国家重点研发计划(2021YFB2601000)
国家自然科学基金面上项目(52178185)
交通运输行业重点科技项目(2022-MS1-080)
规上企业研发机构能力建设专项(22CX8JA092)
出版年
2024
国家科技期刊平台
NSTL
万方数据