Calculation method of mass transfer in concrete under the influence of environment and physical and chemical nature of materials

Abstract

The present invention records a method for calculating mass transfer in concrete under the action of environment and physical and chemical nature of materials, which specifically includes the following steps: Step 1: Based on the nature of physical and chemical action of cement-based material transmission process under the action of erosive environment, the cement-based material The thermodynamic model of the physical and chemical interaction between the pore solution and the hydration product is coupled into the Nernst-Planck equation considering the water convection; Step 2: Using the operator splitting algorithm, the PHREEQC is sequentially mobilized through the MATLAB language to carry out the thermodynamics between the pore solution and the hydration product The calculation of the model and the calculation of the Nernst-Planck equation and water convection by COMSOL, and realize the interaction between the two; Step 3: The calculation results show the relationship between the water in the cement-based material, the ion concentration of the pore solution, and the content of hydration products. Space-time distribution; the invention belongs to the field of civil engineering materials, and the numerical model established by the invention can provide the most intuitive theoretical basis for the durability design of cement-based materials and the prediction of the service life of reinforced concrete structures.

Description

technical field [0001] The invention belongs to the field of civil engineering materials, and in particular relates to a method for calculating mass transfer in concrete under the action of the physical and chemical nature of the environment and materials. Background technique [0002] For a long time now and in the future, reinforced concrete structures are playing an extremely important role as the main structural form in the field of civil engineering. In recent years, with the rapid development of my country's economy and society, my country has been and will be in the construction of large-scale infrastructure for a long time, and concrete projects with a large investment of tens of billions have just been completed, or are under construction, or are in the process of being designed. For example, the Hangzhou Bay Cross-sea Bridge with a total length of 36km was completed and opened to traffic in 2008; the Qingdao Jiaozhou Bay Bridge with a total length of 34.48km was co...

AI Technical Summary

Problems solved by technology

However, previous research work often focused on the metaphysical transport model, and did not establish a corresponding theoretical model from the nature of the transport process.

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