表面涂层对混凝土吸水性能的影响

采用四种表面涂层,以吸水率为评价指标,研究混凝土试件涂刷表面涂层后吸水性能的变化规律。试验结果表明,表面涂层在不同程度上降低了混凝土试件吸水率,其中聚氨酯涂层效果最佳,乳胶涂层效果最差,氟碳涂层、桥梁涂层效果介于聚氨酯涂层与乳胶涂层之间。混凝土试件的吸水率随着涂层涂刷遍数的增加逐渐降低,而降低幅度在减小,根据混凝土结构所处环境,从经济性角度选择适当的涂刷遍数。空白件及涂刷涂层的混凝土试件吸水率均随着水灰比的增大而提高。

Influence of Surface Coating on Water Absorption Performance of Concrete

Four kinds of surface coatings were used, and the water absorption rate was used as an evaluation index to study the change law of water absorption performance of the concrete specimens after the surface coating. The test results show that the surface coatings reduce the water absorption rate of the concrete specimens to varying degrees. The effect of polyurethane coating is the best, and the effect of emulsion coating is the worst. The effects of fluorocarbon coating and bridge coating are between the polyurethane coating and the emulsion coating. With the increase of times of coating brushing, the water absorption rate of the concrete specimens gradually decreases, but the reduction range decreases. According to the environment of the concrete structure, select the appropriate times of coating brushing from the economic point. With the increase of water-cement ratio, the water absorption rate of the blank and the painted concrete specimens increases significantly.