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在老厂房的翻修改造、设备基础加固或变更,以及其他混凝土工程质量事故处理中,往往需要在已有混凝土结构上新浇混凝土,而在以往施工中,将清理后的旧混凝土表面涂刷一层水泥净浆,再新浇混凝土,在新、旧混凝土之间的粘接强度很低,难以保证工程质量。目前,采用胶粘剂代替水泥净浆可增强新、旧混凝土之间的粘接强度。这种做法在日、美等国都较普遍。
In the old factory building renovation, equipment foundation reinforcement or change, and other concrete engineering quality accidents, it is often necessary to newly cast concrete on the existing concrete structure, and in the past construction, the surface of the old concrete after cleaning brushing Layers of cement paste and newly poured concrete have very low bonding strength between new and old concrete, making it difficult to guarantee the quality of the project. At present, the use of adhesive instead of cement paste can enhance the bond strength between new and old concrete. This practice is common in Japan and the United States.