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为了探讨模拟环境中混凝土表面与环境间水分传输边界条件,通过模拟试验分析了混凝土的干燥失水变化规律,研究了水灰比和温度等对混凝土水分扩散表面因子变化的影响;此外,还利用数值模拟探讨了人工模拟环境中风速对混凝土水分扩散表面因子和混凝土内湿度分布状态的影响。结果表明:所提出的人工模拟环境中混凝土水分传输表面因子模型可描述温度和风速对混凝土表面因子的影响规律;混凝土表面孔隙面积率可用以表征水灰比对其表面水分传输的影响,且两者间呈指数函数关系;若人工模拟环境中风速和干燥时间超过某定值(约为3m·s-1),则可将环境湿度视为混凝土与环境间的界面湿度,可为确定人工模拟试验环境风速参数提供理论依据。
In order to investigate the boundary condition of moisture transfer between concrete surface and environment in simulated environment, the variation law of water loss and dryness of concrete was analyzed through simulation test. The influence of water-cement ratio and temperature on the change of surface moisture diffusion coefficient of concrete was also studied. In addition, Numerical simulation is conducted to investigate the effect of wind speed on the surface water diffusion coefficient and the humidity distribution in the concrete under artificial simulated environment. The results show that the proposed model can describe the influence of temperature and wind speed on concrete surface factors. The surface area ratio of concrete surface can be used to characterize the influence of water-cement ratio on the surface water transport, and two If the wind speed and drying time exceed a certain value (about 3m · s-1) in the simulated environment, the ambient humidity can be regarded as the interface humidity between the concrete and the environment, which can be used to confirm the artificial simulation Experimental environment, wind speed parameters provide a theoretical basis.