基于水泥水化的水泥基材料热—湿—碳化耦合模型研究
[Abstract]:Carbonation resistance is one of the main properties of cement-based materials in durability. In the process of carbonation, the internal temperature, humidity, porosity and carbonation material of cement-based materials all have corresponding physical and chemical changes and interactions. It is of great significance to quantitatively characterize the thermal-wet-carbonation coupling law of cement-based materials in order to understand the carbonation resistance of cement-based materials and predict the carbonation depth. The research work of this paper is as follows: (1) the carbonation degree of concrete is evaluated by phenolphthalein method, (TGA), X ray phase analysis method, infrared spectrum method and calcium carbonate quantitative analysis method. By comparing the test results qualitatively and quantitatively, the advantages and disadvantages and applicability of various concrete carbonation evaluation methods are comprehensively analyzed. (2) based on the particle size distribution function of cement particles, periodic boundary conditions are introduced. The resulting cement particles are distributed one by one from large to small to the cube simulation unit. Considering the influence of mineral composition, particle size distribution curve and water-cement ratio on cement hydration, three quantitative parameters were introduced to improve the present 3D spherical cement hydration model. It is more scientific than the empirical selection in the range of parameters. The whole process of cement hydration was analyzed from the point of view of microstructure and hydration products by using the improved cement hydration model. The internal microstructure of cement stone was reconstructed by computer simulation. The hydration products and pore structure were analyzed, and the hydration exothermic method and thermogravimetric analysis method were used. The simulation results of cement hydration model are verified by mercury injection method. (3) based on the basic theory of multi-field coupling in porous media, the carbonation mechanism of cement-based materials is considered, and the content of carbonable substances in the initial carbonation state is combined with the cement hydration model. The carbonation theory model of cement-based materials was established by porosity and saturation. The model takes into account the transformation between gas, liquid and solid phases in cement-based materials, and introduces the pore structure changes caused by the volume expansion of carbonation products and the interaction between temperature and humidity and carbonation. The carbonation control equations of cement-based materials satisfying the mass equilibrium, chemical equilibrium, ion equilibrium and porous media theory in local coordinates are established. (4) based on the cement hydration model, the carbonation of CH and CSH is considered. The change of calcium carbonate content at different depth inside the slurry was studied theoretically and experimentally. The development of calcium carbonate content at different measuring points with different water-cement ratio was obtained, and the results were in good agreement with the model simulation results. The reliability of the numerical model is verified. (5) based on the carbonation theory model of the pure mortar, the carbonization model of mortar and concrete is established by taking into account the aggregate dilution effect, boundary effect and interfacial effect. The change of calcium carbonate content at different depths of mortar and concrete was studied and the change of calcium carbonate content at different measuring points was obtained under different water-cement ratio and different carbonation age. By solving the model, the experimental results and the model results are compared and analyzed. Based on the theoretical model, the effects of ambient temperature, humidity and concentration of carbon dioxide on the carbonation performance, as well as the influence of carbonation on the pore changes of cement-based materials are further analyzed.
【学位授予单位】:浙江大学
【学位级别】:博士
【学位授予年份】:2016
【分类号】:TU528
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