某质子治疗中心辐射屏蔽结构大体积混凝土水化热温度监测与分析  

Monitoring and analysis of hydration heat temperature of mass concrete in radiation shielding structure of a proton therapy center

作　　者：毕传珠 张元植 董自勇 李坤 BI Chuanzhu;ZHANG Yuanzhi;DONG Ziyong;LI Kun('1.Sichuan Testing Center for Construction Engineering Quality Limited,Chengdu 610081,China;Sichuan Institute of Building Research,Chengdu 610081,China)

机构地区：[1]四川省建筑工程质量检测中心有限公司,四川成都610081 [2]四川省建筑科学研究院有限公司,四川成都610081

出　　处：《四川建筑科学研究》2024年第6期65-74,共10页Sichuan Building Science

基　　金：四川华西集团科技项目(HXKX2019/020)。

摘　　要：首先,对比了各混凝土水化放热预测模型和传热参数,针对某肿瘤质子治疗中心建筑试验段进行了大体积混凝土水化放热温度监测,获得了其内部温度场分布。然后,选取合适的计算参数进行了足尺模型有限元分析,结果表明,采用《大体积混凝土施工标准》(GB 50496—2018)中水化放热模型的计算结果与实测结果吻合最好。最后,对影响该类型大体积混凝土水化放热的因素进行了参数分析,并对该类型工程特点进行了分析,对减小水泥用量、采用低热水泥、优化入模温度、增加保温养护措施等降低水化热措施进行了对比研究。分析结果表明,采用低热水泥和减小水泥用量对降低水化放热和内部温度水平最为有效,是否增加保温养护措施对混凝土里表温差的影响最显著。The prediction models and heat transfer parameters of concrete hydration heat release were firstly compared.The hydration heat release temperature of mass concrete was monitored in the building test section of a tumor proton therapy center,and the distribution of its internal temperature field was obtained.Furthermore,appropriate calculation parameters were selected for the full-scale model finite element analysis.The results show that the calculation results of the hydration heat release model in Standard for construction of mass concrete(GB 50496—2018)are in the best agreement with the measured results.Finally,the factors affecting the hydration heat release of this type mass concrete were analyzed by parameters and the characteristics of this type engineering were analyzed.The measures to reduce hydration heat,such as reducing the amount of cement,using low-heat cement,optimizing the temperature of mixture placing to mold,and increasing the thermal insulation and curing measures,were compared.The analysis results show that the use of low-heat cement and reducing the amount of cement are the most effective in reducing hydration heat release and internal temperature level,and whether to increase the thermal insulation and curing measures has the most significant impact on the concrete temperature difference of core and surface.

关 键 词：大体积混凝土 水化热 温度监测 有限元计算 参数分析 

分 类 号：TU755[建筑科学—建筑技术科学]