水泥基材料热湿耦合传输性能

Transport Performances for Coupled Heat and Moisture in Cement-based Materials

摘要:

通过大气环境下水泥基材料热湿耦合传输试验，考察了温湿度梯度对湿传输、温湿度分布的影响。试验结果表明，湿传输随着温湿度梯度的增大而加快，且温度梯度比湿度梯度对湿传输的影响大；温度梯度比湿度梯度对温度分布的影响大；温湿度梯度对相对湿度分布的影响都比较大。因此，在水泥基材料热湿耦合传输过程中，水泥浆的湿传输比砂浆快，且应考虑热传输对湿传输的影响，但湿传输对热传输的影响可以忽略。计算结果表明，热湿耦合传输模型对水泥基材料具有较好的适用性。

Abstract:

By adopting coupled heat and moisture tests in cement-based materials， this paper investigated the effects of temperature and humidity gradients on moisture transport and temperature and humidity distributions. The results reveal that temperature and humidity gradients accelerate moisture transport， and the effect of temperature gradient on moisture transport is more significant than humidity gradient. Moreover， the temperature gradient has a greater effect on temperature distributions than the humidity gradient， and the temperature and humidity gradients have a significant effect on relative humidity distributions. It is， therefore， concluded that during coupled heat and moisture transport in cement-based materials， the moisture transport of cement paste is faster than that of mortar， and the effect of heat transfer should be considered on moisture transport， while the effect of moisture transport could be neglected on heat transfer. The calculated results show that the coupled heat and moisture transport model has a great applicability to cement-based materials