重力坝加高结合部位粘结性能试验研究

摘要

针对水库重力式大坝加高加固问题进行试验研究，对后帮式、前帮式、外包式以及戴帽式加高方式建立实验模型评价新旧混凝土结合面的粘结性能。抗折强度试验和微观电镜试验结果表明，四种类型的加高方式，外包式的结合面最大，抗折强度最高，粘结性能最强。采用水泥砂浆处理后增多了结合面的纤维状C-S-H凝胶，增强了新旧混凝土之间的粘结性能，合理的加固方式加上结合面处理有利于提高坝体的安全性能。%The heightening and reinforcement of Gravity Dam of Reservoir has been carried out a study ,to es-tablish test model based on the latter type,the former type,outsourced,hat heightening way evaluate bonding properties of the surface to build experimental model to evaluate the combination of old and new concrete surface bonding properties.Flexural strength tests and microscopic electron microscopy results showed that the joint surface of the heightening and outsourced in the four types is the largest;the flexural strength is the highest;the bond performance is the strongest.mortar joint surface after treatment by cement mortar has in-creased fibrous CSH gel,and enhance the bond between old and new concrete performance,a reasonable rein-forcement coupled with the joint surface treatment can improve dam safety performance.