混凝土界面处理工艺对劈裂粘结性能的影响

Effect of Different Interface Treatment Processes on Anti-stripping Performance of Low Shrinkage-high Viscosity Multi-element Composite Mortar Repaired Concrete Workpiece

为探究低收缩高粘性多元复合修复砂浆(LSHVRM)修复混凝土不同界面处理工艺对粘结性能的影响,试验设计54个修复试件。研究了针对混凝土的界面碳化程度以及是否埋置钢筋的不同工况,采用涂刷迁移型阻锈剂、喷涂DPS补强剂和涂刷迁移型阻锈剂、钢筋锈蚀转化等处理工艺对粘结性能的影响。试验结果表明:混凝土表面碳化程度对粘结性能的影响很小,表面涂刷迁移型阻锈剂不会对粘结性能产生不利影响,影响幅度在-1.4%~6.8%之间;喷涂DPS补强剂对粘结性能均有提高,提高幅度在2.7%~7.4%之间。混凝土界面有锈蚀钢筋时,经过钢刷处理后对粘结性能的影响很小,幅度在-2.7%~5.4%之间;喷涂DPS补强剂和涂刷迁移型阻锈剂对粘结性能有提高,提高幅度在0.6%~6.9%之间;钢筋锈蚀转化剂后再喷涂DPS补强剂对粘结性能均有提高,提高幅度在4.5%~16.6%之间。混凝土表面不同碳化程度下,锈蚀钢筋钢刷处理、涂刷迁移型阻锈剂和钢筋锈蚀转化等界面处理工艺对粘结性能不会产生不利影响,对粘结性能均有提高,但幅度有限。

In order to reveal the effect of different interface treatment processes on the bonding properties of low shrinkage and high viscosity multi-element composite repair mortar(LSHVRM)to the repaired concrete workpiece,54 repair test-pieces were designed.The effect of treatment processes,such as brushing migration corrosion inhibitor,spraying DPS reinforcing agent,brushing migration corrosion inhibitor and chemical conversion of corrosion products on steel bar on the anti-stripping performance of the repaired workpieces were studied especially,focusing on the influence of carbonization degree of concrete interface at the site to be repaired and whether there are steel bars buried or not.The results show that the carbonization degree of the surface of the repairing concrete has only a little effect on the bonding performance,namely the surface brushing migration type rust inhibitor resulted in an effect range between-1.4%and 6.8%.The spraying DPS reinforcing agent resulted in an increase range of 2.7%-7.4%.In case,rust steel bars emerged at the interface,the effect of steel brush treatment brought an effect range of-2.7%to 5.4%.However,The combination of spraying DPS reinforcing agent and brushing migration corrosion inhibitor could increase the bonding performance within a range of 0.6%and 6.9%.The spraying DPS reinforcing agent after the treatment with chemical conversion agent for rust steel bars could provide an increasing effect within a range of 4.5%and 16.6%.In general,the interface treatment process,such as steel brush treatment of steel bar,brush migration corrosion inhibitor and chemical conversion treatment of the rust steel bar,will bring little adverse effect on the bonding performance of the repaired concrete,while bring improvement effect within a small range,although these treatment methods has induced different degrees of carburization for the surface of repairing concrete.