三维细观早龄期混凝土导热性能数值模拟  

3D Mesoscopic Numerical Simulation on Thermal Conductivity of Early-age Concrete

作　　者：赵卫平[1] 刘英健 生兆川 程赛 徐旸 ZHAO Weiping;LIU Yingjian;SHENG Zhaochuan;CHENG Sai;XU Yang(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Tianjin Teda Construction Group Co.,Ltd.,Tianjin 300457,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国矿业大学(北京)力学与土木工程学院,北京100083 [2]天津泰达建设集团有限公司,天津300457 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《材料导报》2025年第10期107-116,共10页Materials Reports

基　　金：国家自然科学基金联合基金重点项目(U22A20244);国家自然科学基金(52278467)。

摘　　要：为研究早龄期混凝土的导热性能,建立了三维细观混凝土模型,分别对不同龄期的混凝土圆柱体模型进行导热性能数值模拟。研究了石灰岩、粉砂岩、玄武岩和石英岩四种岩石种类骨料,并以玄武岩混凝土为例分析了三种不同体积占比以及三种不同粒径级配对早龄期混凝土导热性能的影响。结果表明:三维细观混凝土模型适用于早龄期混凝土的导热性能数值模拟,可以清晰地描绘骨料模型的几何外形及空间分布,展现早龄期混凝土内部的温度场、等温线以及热流场,准确地预测混凝土的导热性能。混凝土导热系数随着龄期的延长而减小,且混凝土的导热系数减小幅度逐渐变小并趋于稳定。混凝土模型的导热系数与岩石的导热系数呈正相关,岩石骨料的导热系数越大,混凝土整体的导热系数也越大。骨料体积占比对混凝土导热系数影响显著,混凝土的骨料体积占比越小,混凝土的导热系数越小。骨料粒径级配对混凝土导热系数的影响不显著。有限元模拟计算值与Hamilton和Crosser导热系数模型理论值之间的误差均在2.5%以内,表明模拟结果具有较高的准确性。In order to study the thermal conductivity of early-age concrete,3D mesoscopic concrete models were established to simulate the thermal conductivity of concrete cylinder model at different ages.The concrete model included four kinds of rock aggregates such as limestone,siltstone,basalt and quartzite,and especially to the basalt concrete,the influences of three kinds of volume proportions and size gradations on the thermal conductivity of early-age were analyzed.The results show that the 3D mesoscopic concrete model is suitable for numerical simulation of thermal conductivity of early-age concrete,which can clearly describe the geometric shape and spatial distribution of aggregate model,show the internal temperature fields,isotherms and heat flow fields of early-age concrete,and accurately predict the thermal conductivity of concrete.The thermal conductivity of concrete decreases with the extension of curing age,and its reduction range becomes smaller and tends to be stable.The thermal conductivity of concrete is positively correlated with the thermal conductivity of rock.The greater the thermal conductivity of rock aggregate is,the greater the thermal conductivity of concrete is.The volume proportion of aggregate has a significant effect on the thermal conductivity of concrete.The smaller the volume proportion of aggregate,the smaller the thermal conductivity of concrete.The effect of aggregate particle size grade on the thermal conductivity of concrete is not significant.The values from finite element simulation have a high accuracy calculated with an error of less than 2.5%to the theoretical values from H-C model.

关 键 词：早龄期混凝土 参数化建模 导热性能 细观混凝土 数值模拟 

分 类 号：TU528[建筑科学—建筑技术科学]