无机胶粘贴铝合金板与混凝土界面黏结性能试验

Experiment on bond behavior of aluminum alloy plate bonded to concrete by inorganic adhesive

摘要:

为满足耐环境侵蚀及较高使用温度要求而采用的无机胶粘贴铝合金板加固混凝土结构,需解决铝合金板、胶与界面的黏结问题.以黏结长度为基本参数,分别采用硫铝酸盐水泥浆、磷酸镁水泥浆及碱激发矿渣浆三种无机胶粘剂,将3 mm厚铝合金板粘贴至素混凝土试块,完成了无机胶粘贴铝合金板与混凝土界面双剪性能试验.试验结果表明:铝合金板、胶层与界面黏结性能随黏结长度与胶粘剂种类不同而不同,破坏时主要表现为铝合金板脱粘、胶层失效及界面失效三种典型形态；发现相同黏结条件下,三类无机胶粘贴铝合金板与混凝土界面黏结强度中,磷酸镁水泥最大、硫铝酸盐水泥其次、碱激发矿渣最小.基于实测的界面黏结-滑移关系,获得了适用于不同胶粘剂的有效黏结长度取值方法,提出了与试验结果吻合较好的三类无机胶黏结强度-滑移关系模型.可为粘贴铝合金板加固混凝土受弯构件用无机胶粘剂优选提供参考.

Abstract:

The use of inorganic adhesive to bond aluminum alloy (AA) plate for strengthening reinforced concrete structure provides an effective solution to meet the requirement of corrosive environmental resistance and high ambient temperature, where the problem of interfacial bond of AA plate, adhesive, and concrete surface is essential to be solved. Taking adhering length as dominate parameter, the dual shear test of concrete-AA plate was conducted using three inorganic adhesives including sulfur aluminate cement, magnesium phosphate cement, and alkali activated slag for adhering two 3 mm-thick AA plate on prismatic concrete samples. Three typical failure modes (AA plate debonding, adhesive failure, and interfacial bonding failure) were observed for different bonding lengths and adhesives. It was found that under the same condition the maximum values of bonding strength between adhesive and AA plate were mainly provided by magnesium phosphate cement, followed by sulfur aluminate cement, and the last was alkali activated slag. The effective bonding length was analyzed on the basis of the data of interfacial bonding force and slip. A model of the relationship between bond strength and slip for three inorganic adhesives was proposed. This study provides reference for optimizing the inorganic adhesives applied to the flexural members strengthened by bonding AA plate.