连续碳纤维织布-氯氧镁水泥浆加固贴层的直剪研究

Direct Shear Study of Strengthening Layer Made of Continuous Carbon Fiber Fabric-Magnesium Oxychloride Cement Paste

对连续碳纤维织布-氯氧镁水泥浆加固贴层进行了直剪测试,探讨了延长养护龄期、增加用水量、掺加硅灰和掺加有机胶材等方法对氯氧镁水泥浆黏结性能的改性效果,并分析了改性机理.结果表明:延长养护龄期、掺加硅灰和掺加有机胶材能够有效提高氯氧镁水泥浆的黏结性能,但增加用水量却降低该性能.硅灰是一种极为细微的粉末,当其掺量为10%(质量分数)时,其可在氯氧镁水泥浆中分散,并在向碳纤维间隙填充时把水泥浆带入,从而增加了水泥浆对碳纤维的包裹,增强了水泥浆的黏结性能.有机胶材在氯氧镁水泥浆中能很好分散,这使其能充分发挥作用,提高水泥浆的黏结性能.氯氧镁水泥浆作为胶材较有机胶材性能差,这主要是因其对连续碳纤维织布浸润性较弱所致.

Strengthening layer made of continuous carbon fiber fabric-magnesium oxychloride cement （MOC） paste was tested by direct shear.Improvement of bonding performance of MOC paste was explored by extending curing time,increasing water content,adding silica fume and adding organic binder（epoxy resin）. The mechanism of the improvement was analyzed.The results indicate that the bonding performance of MOC paste can be improved by extending curing time,adding silica fume and adding organic binder instead of adding water.Silica fume is a kind of superfine powder,when its use level is 10%（by mass）,it can be well dispersed in MOC paste and filled in the gaps between carbon fibers.Thus,the carbon fiber can be wrapped better by MOC paste to increase the bonding performance of the paste.And the organic binder can also be well dispersed to play the full role to improve the bonding performance of MOC paste.Because of the lower infiltrating property of MOC paste to the continuous carbon fiber fabric,MOC paste as the binder is not as good as organic binder.