基于柔性防水层体系与玻化砖黏结强度试验研究

Experimental study on bonding strength betw een flexible w aterproof layer system and vitrified tiles

柔性防水层体系在室内装饰中的应用见广,但其被发现在工程应用中常出现掉砖现象。通过设置不同基面湿润次数、防水层养护时间以及瓷砖背面纹路,针对失效机理中涉及的部分问题进行了研究。结果表明,混凝土基面经两次均匀湿润后,柔性防水层体系与玻化砖黏结强度达到最佳值;当防水层的养护时间在24 h以下,该体系黏结强度有明显下降;瓷砖背面纹路可以看作是对瓷砖黏结剂的约束作用,在湿度和温度的变化下限制其干缩湿胀,试验发现瓷砖背面纹路越开放,其黏结强度越大;另外分析发现,在理想施工与环境下,最佳破坏形式是使界面破坏与内聚破坏的占比接近。

Flexible waterproof layer system is extensively used in numerous applications.However,the most common failure mechanism of the system is interface damage in engineering application.Some problems of failure mechanism were studied by setting different wetting times of base surface,curing time of waterproof layer and grain on the back of vitrified tiles.The results show that the adhesive strength of the flexible waterproof layer system and the vitrified tiles reach the optimal value when the concrete foundation is uniformly moistened twice.When the curing time of the waterproof layer is less than 24 h,the bonding strength of the system decreases obviously.The grain on the back of vitrified tiles is regarded as the constraint effect on the ceramic tile adhesive.Under the change of humidity and temperature,the grain on the back of vitrified tiles limits the shrinkage and expansion of ceramic tile adhesive.In addition,it is found that under ideal construction and environment,the best form of the failure modes is to balance the mixture failure of interface and cohesive.