水性环氧砂浆修复混凝土的黏接界面性能

Bonding interface performance of water-borne epoxy motor for repairing concrete

采用水性环氧树脂制备水性环氧砂浆,针对混凝土结构补强加固过程中改性砂浆-混凝土黏结面薄弱环节,开展改性砂浆和混凝土黏结抗拉试验,研究了界面干湿状况、混凝土表面粗糙度和界面剂类型对改性砂浆-混凝土界面黏结强度的影响。结果表明:界面干湿状况是影响黏结强度的主要因素,干燥界面的抗拉强度高于湿润界面,在研究其对黏结强度的影响时,需综合考虑改性砂浆中乳液掺量。对改性砂浆与混凝土的结合面进行一定程度的粗糙处理,可以提高界面黏结强度;使用界面剂可以改善改性砂浆与混凝土接触的界面区结构,增强黏结性能,需考虑界面干湿状况和界面接缝方式对黏结的影响。

The epoxy modified mortar is prepared with water-based epoxy resin.Aiming at the weak link of the modified mortar-concrete bonding surface during the reinforcement of the concrete structure,a tensile test of the modified mortar and concrete bonding is carried out.The tests were conducted to study the dry and wet conditions of the interface together with the influence of concrete surface roughness and interface agent type on the bond strength of modified mortar-concrete interface.The results showed that the dry and wet conditions of the interface are the main factors affecting the bond strength.The tensile strength of the dry interface is higher than that of the wet interface.Amount of emulsion in the modified mortar is comprehensively considered during bond strength analysis.The paper further determined that a certain degree of rough treatment on the bonding surface of the modified mortar and concrete improves the interface bonding strength.The use of interface agents improves the structure of the interface area at the joint of the modified mortar and concrete;hence,enhancing the bonding performance while considering the bonding,influence of interface dryness,wetness and seam method at the same time.