多孔烧结陶片在盐溶液中的吸水特性

外墙多孔饰面层在含盐环境下的吸水特性变化，将影响利用被动蒸发技术之低能耗建筑的效能。为探寻盐浓度对陶片吸水特性影响的规律，以一种常用陶片分别在纯水、3.5%及26.3%质量分数NaCl溶液中，采用部分浸泡法进行吸水实验。结果显示：毛细吸水系数在3.5%溶液中比纯水高17.57%，在26.3%溶液中比纯水低12.17%。陶片吸收纯水质量随溶液浓度提高呈线性下降趋势。达到毛细饱和时，陶片含水量在3.5%溶液中比纯水低2.50%，在26.3%溶液中比纯水低16.18%；继续连续吸水24 h后，陶片含水量在3.5%溶液中比纯水低3.18%，在26.3%溶液中比纯水低20.51%。综合而言，盐分将削弱陶片吸收纯水的能力，削弱水平随盐分浓度提高而增强，陶片在滨海含盐环境中吸水情况将明显区别于内陆地区。

Water absorbing characteristics of porous firing clay tiles in saline solutions

Water absorption of porous materials were influenced by sea salt. It would lead to changes of the efficiency of the low-energy buildings using passive evaporation cooling technology. To find the relations between the concentration and the water absorption characters, we conducted water absorption tests through partial immersion method with common porous fire-clay tiles and NaCl solution with different concentrations. Compared to the pure water case, tiles'' capillary absorption coefficient was higher by 17.57% in solutions with the concentration of 3.5% by weight (same below), and lower by 12.17% in 26.3% solution. Pure water absorption reduced while concentration increased. Capillary saturated water content was lower in 3.5% solution than in pure water by 2.50%, and lower in 26.3% solution than in pure water by 16.18%. Continuous absorption for 24 hours, the pure water content was lower in 3.5% solution than in pure water by 3.18%, and lower in 26.3% solution than in pure water by 20.51%. In summary, salts would weaken the water absorption ability of the tiles. The higher the concentration of the solution was, the absorption would be weaker. As a result, water absorption of the tiles in the coastal saline environments would be different from the inland situation.