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讨论了水泥基孔隙材料水分传输的主要机理,建立了孔隙水分传输的多相和简化模型。测试了胶凝材料含有70%矿渣的净浆和砂浆材料的等温吸附与脱附曲线(WVSI),得到了孔隙材料的水分特征曲线。利用水分传输模型对等温吸附实验脱附过程的实验数据进行回归,得到材料的本征渗透率。结果表明:在相对湿度h=60%时,两个模型的回归结果相近;在相对湿度h=18%时,两个模型的回归结果相差较大;简化模型仅适用于中等湿度(h=60%)及以上环境中水分传输过程的描述;基于等温吸附曲线数据,利用模型回归水泥基材料本征渗透率的方法基本可行。
The main mechanism of water transport in cement-based porous materials was discussed. A multiphase and simplified model of pore water transport was established. The isothermal adsorption and desorption curve (WVSI) of the paste and mortar material containing 70% slag was tested. The water characteristic curve of the pore material was obtained. The moisture transfer model was used to regress the experimental data of isothermal adsorption desorption process to get the intrinsic permeability of the material. The results show that the regression results of the two models are similar at the relative humidity of h = 60%; the regression results of the two models differ greatly at the relative humidity of h = 18%; the simplified model is only suitable for medium humidity (h = 60 %) And the above description of the process of water transport; based on isothermal adsorption curve data, the use of model regression method of intrinsic permeability of cement-based materials is feasible.