新型超快硬磷酸盐修补材料抗盐冻剥蚀性能

DEICER-SCALING RESISTANCE OF PHOSPHATE CEMENT-BASED BINDER FOR RAPID REPAIR OF CONCRETE

着重对在除冰盐和冻融循环共同作用下 ,磷酸盐水泥 (MPB)基材料的盐冻剥蚀破坏和与OPC混凝土之间的粘结强度损失进行了研究。试验结果表明MPB材料本身具有很高的抗盐冻剥蚀性能 ,不比引气 4 5 %～ 6 5 %的OPC混凝土差。MPB材料与引气OPC混凝土之间的粘结强度损失明显比非引气OPC混凝土小 ,且含气量愈大 ,粘结强度损失愈小。此外 ,还对MPB材料的气泡结构进行了分析 ,结果显示MPB材料通过化学引气同样可以获得良好的气泡结构参数 ,起到与物理引气一样的抗冻或抗盐冻效果。

In this paper,the deicer-scaling resistance of MPB mortar and concrete,and the bond strength loss between MPB paste and mortar with OPC concrete were mainly investigated.Experimental results show that MPB materials themselves have high deicer frost resistance,which is not lower than that of OPC concrete with the air content of 4 5%～6 5%.The bond strength loss between MPB materials and OPC concrete with the air-entraining agent are obviously lower than OPC concrete without the air entraining agent,and the higher the air content in OPC concrete is,the smaller the loss is.Furthermore,the air-bubble parameters were analyzed, which indicates that MPB mortar and concrete can also obtained reasonable air-bubble structure by chemical reactions.