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从混凝土传热过程的基本理论出发,结合人工气候环境下粉煤灰混凝土导热系数的试验结果,研究了粉煤灰混凝土微环境温度响应规律及响应预计模型.结果表明:粉煤灰混凝土导热系数随着粉煤灰掺量的增大而逐渐降低,但随着微环境相对湿度的增大而逐渐增大,且影响规律基本服从线性关系;粉煤灰掺量的提高使混凝土内外环境温度响应速率减慢(微环境相对湿度一定);粉煤灰混凝土内微环境相对湿度(孔隙水饱和度)的增大,使粉煤灰混凝土内外环境温度响应速率加快;混凝土微环境温度与外界环境温度响应实质为传热学上的非稳态传热问题,且理论分析与试验结果吻合较好.
Based on the basic theory of heat transfer process of concrete and the experimental results of thermal conductivity of fly ash concrete in artificial climate environment, the response law and response prediction model of fly ash concrete microenvironment are studied.The results show that the thermal conductivity of fly ash concrete With the increase of the content of fly ash, the content of fly ash gradually decreased, but gradually increased with the increase of relative humidity of the microenvironment, and the influence law basically obeyed the linear relationship. The increase of fly ash content increased the temperature response The relative humidity of the fly ash concrete increases (pore water saturation), the internal and external environment of fly ash concrete temperature response speed; concrete micro-environment temperature and ambient temperature The response is essentially the heat transfer problem of unsteady heat transfer, and the theoretical analysis is in good agreement with the experimental results.