不同界面剂对第二龄期新老混凝土粘结强度的影响

选用普通硅酸盐混凝土作为试验混凝土,采用水泥净浆、掺粉煤灰的水泥净浆和掺新型固结材料TG-1的水泥净浆作为试验粘结剂,分别用这三种界面剂对第二龄期新老混凝土进行了粘结试验。7 d及28 d的试验结果表明:(1)水泥净浆界面剂的粘结效果随着其水灰比的增大而增强;(2)掺粉煤灰的水泥净浆界面剂对混凝土新老粘结界面强度的影响规律性不强;(3)掺TG-1固结剂的水泥净浆界面剂的粘结效果随着TG-1固结剂掺量的提高而增强。最后,对试验所产生的结果进行了机理分析。

Impacts from different bonding agents on bonding strength between new and old concretes of second age

By taking the normal portland cement concrete as the concrete for experiment and using the pure cement paste，the pure cement paste mixed with fly-ash and the pure cement paste mixed with the new type of consolidating material—TG-1 as the bonding agents for experiment，the experiment for bonding between new and old concretes are carried out with these three bonding agents respectively. The results of the experiments of 7d and 28d show that （1） the bonding effect of the bonding agent of the pure cement paste increases along with the increase of its water-cement ratio；（2） no strong regularity of the impact from the pure cement paste mixed with fly-ash on the bonding strength between new and old concretes； （3） the bonding effect of the pure cement paste mixed with the TG-1 consolidation agent increases along with the increase of the content of the agent. Finally，a mechanism analysis is made on the experiment result as well.