硅酸盐通报2026，Vol.45Issue(1)：69-80,12.DOI:10.16552/j.cnki.issn1001-1625.2025.0799
冻融循环作用下相变混凝土温度响应及热力场调控机理研究
Temperature Response and Thermo-Mechanical Field Regulation Mechanism of Phase Change Concrete under Freeze-Thaw Cycles
摘要
Abstract
China has a wide distribution of severely cold and cold regions,where concrete structures are long-term exposed to freeze-thaw cycles,making them prone to damage and significantly shortening their service life.Leveraging their heat absorption and release properties,phase change materials can effectively regulate the temperature and stress fields within concrete.Based on this,this study first established a mesoscale finite element model of phase change concrete considering different phase change material content and replacement ratios of recycled aggregates,and validated the model's accuracy through CT scanning tests.Subsequently,the finite element numerical simulation method was employed to analyze the temperature response and the evolution law of the thermal-mechanical field in phase change concrete during freeze-thaw cycles.The results indicate that phase change materials can effectively inhibit the transfer rate of external temperature into concrete,mitigating the temperature fluctuations caused by increased replacement ratios of recycled aggregates.Meanwhile,the incorporation of phase change materials significantly reduces the average thermal stress and the maximum principal stress difference within concrete.When the content of phase change materials increases from 0%to 8%(mass fraction),the average thermal stress of concrete decreases by 12.6%,and the average maximum principal stress difference in the interfacial transition zone between aggregates and mortar drops by 47.0%.By buffering temperature-induced deformations through their latent heat effects,phase change materials effectively alleviate stress concentration,thereby enhancing the freeze-thaw resistance of concrete.关键词
相变混凝土/再生骨料/冻融循环/热力场/抗冻性能Key words
phase change concrete/recycled aggregate/freeze-thaw cycle/thermo-mechanical field/freeze-thaw resistance分类
建筑与水利引用本文复制引用
李彤,王庆贺,张逸超..冻融循环作用下相变混凝土温度响应及热力场调控机理研究[J].硅酸盐通报,2026,45(1):69-80,12.基金项目
辽宁省应用基础研究计划(2022JH2/101300130) （2022JH2/101300130）
