早龄期混凝土细观结构对温度场分布的影响研究  

Study on effect of mesoscopic structure to distribution of temperature field in early age concrete

作　　者：王猛 刘锦东 方剑峰 连紫旭 聂柯夫 王洋辰 乔丕忠[3] WANG Meng;LIU Jindong;FANG Jianfeng;LIAN Zixu;NIE Kefu;WANG Yangchen;QIAO Pizhong(China Railway No.3 Engineering Group Co.,Ltd.,Jinzhong 030600,China;Hangzhou Railway Hub Project Construction Headquarter,China Railway Shanghai Group Co.,Ltd.,Jinhua 321002,China;School of Ocean and Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]中铁三局集团有限公司,山西晋中030600 [2]中国铁路上海局集团有限公司杭州铁路枢纽工程建设指挥部,浙江金华321002 [3]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《混凝土》2024年第11期19-23,共5页Concrete

摘　　要：早龄期混凝土由于水化反应产生的热量,导致温度场的不均一性,进而可能引发温度裂缝,影响结构的整体稳定性。从细观角度出发,将混凝土视作由骨料、水泥浆体和界面过渡区(ITZ)构成的三相复合材料。通过建立二维随机骨料细观数值模型,模拟了混凝土内部的热传导过程。综合考虑了水化热、环境温度波动、对流换热、太阳辐射以及冷却水管等多种环境因素,并对ABAQUS有限元软件进行了二次开发以实现温度场的模拟。通过与实际测量数据的对比,验证了模型的准确性。此外,研究还揭示了ITZ对混凝土内部热传导的热阻效应。本研究的细观数值模型为准确分析混凝土的温度场分布提供了新的视角,对于指导早龄期混凝土的温控措施具有重要的参考价值。The heat generated by the hydration reaction in early-age concrete leads to temperature field heterogeneity,potentially causing thermal cracks that affect the overall structural stability.This study adopts a mesoscopic perspective,treating concrete as a three-phase composite material comprising aggregate,cement paste,and the interfacial transition zone(ITZ).A two-dimensional random aggregate mesoscopic numerical model is developed to simulate the internal heat conduction process in concrete.The model comprehensively considers various environmental factors,including hydration heat,ambient temperature fluctuations,convective heat transfer,solar radiation,and cooling pipes.The finite element software based on ABAQUS is redeveloped to facilitate the temperature field simulation.The model's accuracy is validated by comparing it with the actual measurement data.In addition,it reveals the thermal resistance effect of ITZ on internal heat conduction in concrete.The present mesoscopic numerical model provides a novel perspective for accurately analyzing the temperature field distribution in concrete,offering valuable insights for early-age concrete temperature control measures.

关 键 词：混凝土 早龄期 水化热 温度场 细观 冷却水管 

分 类 号：TU528.01[建筑科学—建筑技术科学]