Intelligent closed-loop control of concrete moisture levels
FAN Qixiang1,2, DUAN Yahui3,4, WANG Yezhen3, WANG Xiaohai1, YANG Simeng3, KANG Xusheng1
1. China Three Gorges Corporation, Beijing 100038, China; 2. China Huaneng Group Co., Ltd., Beijing 100031, China; 3. School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China; 4. School of Urban Construction, Wuchang University of Technology, Wuhan 430023, China
Abstract：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.
樊启祥, 段亚辉, 王业震, 王孝海, 杨思盟, 康旭升. 混凝土保湿养护智能闭环控制研究[J]. 清华大学学报（自然科学版）, 2021, 61(7): 671-680.
FAN Qixiang, DUAN Yahui, WANG Yezhen, WANG Xiaohai, YANG Simeng, KANG Xusheng. Intelligent closed-loop control of concrete moisture levels. Journal of Tsinghua University(Science and Technology), 2021, 61(7): 671-680.
2021, Vol. 61 
