PLC and its expansion module, electric ball valve and cooling pipe, electric heating steel plate and various components of the system, which is used to control test and process data. By automatically adjusting the opening of the valve, the system makes the top temperature and cooling speed develop along the ideal temperature diachronic curve. Moreover, the system enables the temperature difference between inside and surface of test block limited in a given range by automatically controlling the surface board heating. The method of physical simulation test by sandbox with built-in cooling water pipe and heating rod is adopted. On the premise of a given standard value, the operation of the system is checked under different working conditions. Further, an extension of this system is proposed, which enables its application to obtain some thermal parameters when cooperating with numerical simulation.
Key Words
Programmable Logic Controller (PLC); automation; temperature control; concrete construction; concrete
Address
Sheng Qiang — College of Water Conservancy and Hydropower Engineering, Hohai University, 1 Xikang Road, 210098 Nanjing, China
Xue-jun Leng — College of Water Conservancy and Hydropower Engineering, Hohai University, 1 Xikang Road, 210098 Nanjing, China
Xiang-rong Wang — Huai-an Survey and Design Institute of Water Resources Co. Ltd, 9 Shenzhen Road, 223005 Huai-an, China
Jing-tao Zhang — College of Water Conservancy and Hydropower Engineering, Hohai University, 1 Xikang Road, 210098 Nanjing, China
Xia Hua — School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
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