| This article first has carried on the concrete adiabatic temperature rise under the condition of non-heat release. Qualitative and quantitative analysis of concrete initial temperature of concrete in different age, it is concluded that how the concrete hydration heat changing with the age growth. And by using test data, analyzed the calculation precision of different calculation model of concrete hydration. Put forward considering concrete pouring temperature, water cement ratio and hydration degree of concrete hydration heat calculation of numerical model. On the basis of the concrete adiabatic temperature rise test, this paper further studies the continuous low temperature environment exothermic process of concrete. It is concluded that the concrete under different continuous hydration heat emission reduction is the environmental impact of low temperature. Set up considering the continuous low temperature heat release of the environmental impact of concrete numerical calculation formula. Formula calculation results and test data have higher consistency, and it can accurately calculate on other continuous low temperature environment condition of various concrete heat.At the completion of concrete adiabatic temperature rise and continuous low temperature under the condition of heat release test, on the basis of this paper further concrete water-cement ratio on concrete exothermic under different working conditions of quantitative analysis of the work, get bored piles under the influence of different water cement ratio and continuous low temperature was exothermic regularity of concrete, and applied to numerical calculation software fitting out the influence of water-cement ratio and continuous low temperature formula to calculate the heat release. In order to verify the continuous low temperature of concrete hydration degree and the correlation of concrete strength development, using artificial climate chamber and the porosity of concrete strength tester is to complete the continuous low temperature environment test and microstructure analysis, through the strength test the correctness of the continuous concrete exothermic regularity of low temperature environment, sustained low temperature strength development rule and concrete hydration heat degree of correlation, two groups of numerical linear correlation reflects a similar under the same water cement ratio of continuous low temperature in the environment the consistency of concrete hydration degree and intensity change with age. Strength tests are carried out at the same time, application of pore structure tester for microstructure analysis, separately has carried on the concrete porosity, pore size distribution, such as observation, further clarify the continuous low temperature environment affect the internal mechanism of the strength of concrete filling pile.At the end of the paper through the frozen soil pile model test, simulation of the continuous low temperature permafrost environment environment of concrete pile body of pile and the temperature field development of frozen soil, and by using ANSYS finite element software to simulate the temperature field of frozen soil pile, the changes of simulations to predict different frozen soil temperature, different cases of pile body concrete perfusion pile diameter and pile of permafrost changes the development rule of temperature field along with age. At the same time, use the software after parameter optimization, simulation results, the temperature field data in combination with continuous low temperature of concrete hydration and strength development rule, preliminary reach anticipation by continuous low temperature and water cement ratio dual factors under the influence of the strength of frozen soil filling pile and pile body concrete hydration development purposes. |
