Massive Concrete Early Crack Monitoring And Prediction Based On Stress Field

With the rapid development of the national economy, industrial and civil buildings with long, thick and shaped in large concrete structure are increasingly expending and complex. Compared with the normal reinforced concrete, mass concrete complex with boundary conditions, geometric size larger, construction technology and high quality requirements and so on. Mass concrete in the construction process,often occurring due to different stress field caused by the stress of leaving a structural cracks in concrete. With the increase in age of concrete, the cracks will even through sometimes. These cracks and shrinkage cracks together, not only reduces the durability of the structure, but also affect the structure of normal use. It is the protection of mass concrete early crack control that the stress field is accurately predicted. Therefore,it is an important that the stress field based on massive concrete early cracks monitoring and prediction is the quality control of mass concrete construction .This paper is based on the Qingyang Petrochemical Company of China 3 million tons of oil reconstruction project in the relocation of mass concrete, Describes the causes and the factors of the early cracks based on the stress field; Analysis the impact of mass concrete structures boundary conditions,geometry and reinforcement ratio for the stress field; Discussed preliminary the different stress field caused by the temperature factors and non-temperature factors. The key to summed up the calculation of stress field caused by the temperature factors and the early mass concrete construction quality control of specific technical measures.Based on the basic theory of heat conduction, with engineering examples , the principle of the finite element analysis and the general principles of simulated analysis are introduced ,using finite element analysis software ANSYS, for mass concrete construction process was simulated, predicting its early stress distribution, so as to provide a theoretical reference for the early construction of mass concrete quality control, and the results compared with experimental results, the simulation results show that the ANSYS analysis for the early quality control of mass concrete construction to provide technical reference.