Wireless Intelligent Monitoring And Simulating Calculation Thermal Of Pelletized Sand Mass Concrete Bottom Plate

With the height of building is being refreshed constantly,the mass concrete of building bottom plate is increasingly.Then during the mass concrete construction,as the concrete sclerotic process,the cement will release a lot of hydration heat.The concrete will crack because of thermal strain so research on the temperature and strain monitoring to find out the reason of concrete crack,and take proper measures timely avoid harmful crack.In view of Guizhou district using rock sand concrete,taken the land mark building of Guizhou province--Huaguoyuan twin-towers pouring large quantity,fine aggregate gradation difference and so on the engineer difficulties.The mainly work in this dissertation are as follows :(1)According to standard,calculated center temperature and outer temperature of mass pelletized sand concrete bottom plate at different thickness and ages,and according to checking,through cover maintenance the temperature stress is less than concrete tensile strength.(2)Using ANSYS to simulate temperature of mass pelletized sand concrete bottom plate,and analysis the temperature changing with ages,even research on appearing size and time of peak value locate at different plate and age.(3)Apply wireless intelligent monitoring system for pelletized sand concrete bottom plate of GuiYang twin towers monitoring temperature and stress(the total volume of bottom is 16 thousand cubic metres).As the bottom thickness are complicated,under the fourth floor of west tower the core-tube thickness is 8.0m.through temperature sensors and strain sensors will get concrete temperature and strain dynamic variation curve,concluded in the 7 days after concreting the temperature is rise,so cover maintenance is very important,through test proved cover maintenance will reduce the temperature strain,so the monitoring technology and thermal control is reasonably and effectively.(4)This paper using theoretical arithmetic,simulation and monitoring to researching on concrete thermal,and comparative analysis show that simulation is closed to monitoring.