Large Volume Concrete Crack Prevention And Control Measures Of Research

As the scale of construction project is more and more big,the application of mass concrete construction is becoming more and more frequent.How to control the concrete inside and outside the cracks caused by temperature difference and temperature stress deformation,improve the impermeability of concrete,crack resistance and erosion resistance performance,is the construction success or failure of a key issue.In suzhou industrial park is under the engineering background of modern media square,by combining the actual situation of modern media square big slab casting construction,the technology of mass concrete slab crack prevention measures for the following research: 1)On analyzing the principle of mass concrete temperature crack is studied.Mainly analysis the reasons of temperature cracks and temperature cracks on the harm caused by the project,and puts forward how to effectively control the mass concrete temperature crack.2)To the project design of mass concrete of further optimization.Mainly through the analysis of the raw materials of concrete performance characteristics,to optimize the design of concrete mixture ratio,meet low hydration heat,pumpability is good,good volume stability,excellent crack resistance characteristics.3)Calculate the mass concrete temperature stress.Due to the large volume concrete under different constraint conditions of the relationship between deformation and temperature stress of complex,through the finite element method(fem)temperature calculation of concrete pouring process,to get theoretical data.4)Improve adjust temperature control measures taken.According to the actual circumstance of the project,calculation of temperature control,according to the control of concrete mixture ratio design,pouring temperature,the setting of the condensed water pipe and adjustment,the respect such as thermal insulation moisture curing temperature control measures are put forward and its adjustment method.5)Monitoring the construction process of large volume concrete temperature stress.Temperature monitoring program,as defined by the field measured temperature and strain data,and compared with theoretical calculation analysis,to verify the rationality of the temperature control measures take.6)Conclusion improved method of control temperature cracks,provide technical support for the similar projects in the future.