基于热流量平衡的混凝土散热研究  

Analysis of Concrete Heat Loss Based on Heat Balance

作　　者：刘毅[1] 胡书红 魏宝龙 朱振泱[1] 张磊[1] 李海枫[1] LIU Yi;HU Shu-hong;WEI Bao-long;ZHU Zhen-yang;ZHANG Lei;LI Hai-feng(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Yalong River Hydropower Development Co.,Ltd.,Chengdu 610051,China)

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038 [2]雅砻江流域水电开发有限公司,四川成都610051

出　　处：《水电能源科学》2022年第5期135-138,共4页Water Resources and Power

基　　金：国家重点研发计划(2018YFC0406703);国家自然科学基金项目(51779277,51779276)。

摘　　要：早龄期混凝土的热量散失途径包括通水冷却、表面散热和上下层导热等,有限元计算可模拟结构温度发展的过程,但目前对定量计算热量产生、散失和结构热量增加的研究尚未深入。为此,通过热流量积分计算表面混凝土散失的热量,通过温度和热量的关系计算水化放热总量和结构累积的热量,并通过总热量守恒求解通水冷却散失的热量。在此基础上深入分析了各种温控措施对混凝土块温度的影响。结果表明,对浇筑温度有严格控制的混凝土坝,浇筑层厚度增加对混凝土温度峰值影响很小,在施工效率得以保障的情况下,提高浇筑层厚度可提升浇筑效率获取更多的经济利益。The heat loss ways of early age concrete include water cooling, surface heat dissipation and heat conduction of upper and lower layers. Finite element calculation can simulate the temperature development process of structure, but there is no accurate quantitative calculation method for heat generation, heat loss and heat increase of structure. In this paper, the heat loss of surface concrete was calculated by heat flux integral. The total heat release of hydration and the accumulated heat of structure were calculated by the relationship between temperature and heat, and the heat loss of water cooling was solved by the conservation of total heat. On the basis of this research method, this paper deeply analyzed the impact of temperature control measures on concrete block temperature. The results show that for the concrete dam with strict control of pouring temperature, the increase of pouring layer thickness has little impact on the peak temperature of concrete;Under the condition of ensuring the construction efficiency, increasing the pouring layer thickness can improve the pouring efficiency and obtain more economic benefits.

关 键 词：混凝土 热量 温控防裂 浇筑层厚度 

分 类 号：TV315[水利工程—水工结构工程]