混凝土保湿养护智能闭环控制研究  

Intelligent closed-loop control of concrete moisture levels

作　　者：樊启祥 段亚辉[3,4] 王业震 王孝海 杨思盟 康旭升 FAN Qixiang;DUAN Yahui;WANG Yezhen;WANG Xiaohai;YANG Simeng;KANG Xusheng(China Three Gorges Corporation,Beijing 100038,China;China Huaneng Group Co.,Ltd.,Beijing 100031,China;School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430072,China;School of Urban Construction,Wuchang University of Technology,Wuhan 430023,China)

机构地区：[1]中国长江三峡集团有限公司,北京100038 [2]中国华能集团有限公司,北京100031 [3]武汉大学水利水电学院,武汉430072 [4]武昌理工学院城市建设学院,武汉430023

出　　处：《清华大学学报（自然科学版）》2021年第7期671-680,共10页Journal of Tsinghua University(Science and Technology)

基　　金：中国三峡建设管理有限公司重点资助项目(JG/18039B,JG/18040B)。

摘　　要：混凝土浇筑后如不及时进行保湿养护,水泥颗粒不能充分水化转化为稳定的结晶,易产生较大的收缩变形,出现干缩裂纹,影响结构耐久性。基于规范要求及实验室内试块养护的成功经验,确定将混凝土表层湿度≥95%作为自然环境下养护的保湿标准,并建立了混凝土保湿养护数学模型。基于智能建造闭环控制理论,该文提出混凝土保湿养护智能控制方法,并研发了智能控制设备,全面感知混凝土养护面的环境温湿度和风速,定量计算混凝土表面湿度,实时反馈预警自动控制喷淋系统,实现混凝土保湿养护的智能控制。采用智能控制既节约人工费,又避免人为因素影响,确保了混凝土保湿养护质量,可以灵活应用于各种大型复杂结构工程。The concrete moisture content must be maintained after curing.The cement particles in concrete cannot fully hydrate and transform to a stable crystalline form if the concrete is not well hydrated.In addition,moisture loss may result in shrinkage,deformation and cracks,which will affect the structure durability.Concrete specifications and experience have shown that the concrete surface humidity should be no less than 95%during curing.Humidity diffusion theory was used to develop a mathematical model for the concrete moisture conservation with the third type of boundary condition at the surface.Information technology and mechanical control theory were then used to develop an intelligent control method for the concrete moisture conservation.An intelligent control system was then developed to automatically collect the temperature,humidity and wind speed near the concrete surface and to then calculate the concrete surface humidity.The intelligent control system provides real-time feedback warnings and intelligently controls a spray tube which reduces labor costs and ensures the concrete quality.The intelligent control equipment can be flexibly adapted to various large,complex engineering projects.

关 键 词：混凝土 保湿养护 智能控制 防裂 

分 类 号：TV52[水利工程—水利水电工程]