Study On Temperature And Stress-strain Monitoring Of Mass Concrete

Since entering the 21 st century,with the continuous development of China’s economy,the scale and difficulty of industrial and civil buildings and structures are increasing.Mass concrete has become an important form,which is applied in various large-scale construction projects.However,due to the large section thickness of mass concrete,a large amount of heat generated by cement in the process of hydration will not be easily lost in the structure.When the temperature difference between the internal and surface of concrete is too large,temperature stress and temperature deformation will occur.The greater the temperature difference,the greater the temperature stress.When the tensile strength of concrete is not enough to resist the temperature stress,temperature cracks will begin to appear,which will have an adverse impact on the durability and use function of the structure.Therefore,the mass concrete monitoring work is particularly important.Many countries attach great importance to the mass concrete monitoring work,and many field engineers are engaged in it.Combined with practical engineering examples,this paper presents the practical experience of temperature and stress-strain monitoring of mass concrete from the aspects of finite element software analysis,temperature and strain monitoring point layout,sensor installation and debugging before concrete pouring,monitoring indicators and guarantee measures during concrete curing,data collection after curing and comparison with theoretical calculation and analysis The research results provide reference for similar projects in the future.This project is a large volume concrete project for raft foundation of nuclear power plant,which has strict requirements for radiation control and special requirements for structural concrete cracks.The quality requirements of structural concrete in nuclear power plant are very strict,and the objective requirements do not allow the concrete to crack.This puts forward higher requirements for monitoring work,such as accurate calculation,reasonable arrangement of monitoring points,risk prediction in advance and maintenance guidance.