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结构加固中应用的环氧树脂等有机粘结剂的耐高温性不足,升温条件下易丧失力学性能导致结构失效。本文以偏高岭土基地聚物作为无机粘结剂,通过不同温度下的钢-钢拉伸剪切试验和表层嵌贴CFRP-混凝土拔出试验,考察地聚物粘结剂在升温条件下的粘结性能变化规律。试验结果表明:在常温环境下,树脂粘结剂的粘结性能优于地质聚合物粘结剂的粘结性能;但在本文试验设置的升温条件下,树脂粘结剂试件的粘结承载力明显下降,而地质聚合物粘结剂试件的粘结承载力则基本不受温度变化的影响。对粘结界面的粘结滑移本构关系的分析表明,随着温度升高,树脂粘结剂的最大粘结应力逐渐降低,其对应的滑移量也有所增大;与之相比,地聚物粘结剂的最大粘结应力及滑移均未随温度升高发生显著变化,证明了地聚物粘结剂的粘结性能对本文试验温度不敏感。这表明地质聚合物具有较好的耐高温性能,有发展无机粘结剂的潜力。
Structural adhesives used in epoxy resin and other organic binder high temperature resistance, easy to lose mechanical properties under elevated temperature conditions lead to structural failure. In this paper, metakaolin base polymer as an inorganic binder, through the different temperature steel-steel tensile shear test and the surface embedded CFRP-concrete pull-out test to investigate the geopolymer adhesive viscosity The change of junction performance. The experimental results show that the adhesive property of the resin adhesive is better than the adhesive property of the geopolymer adhesive under the normal temperature environment. However, under the condition of the temperature rising set in this experiment, the adhesive load of the resin adhesive test piece Force decreased obviously, while the bond strength of geopolymer binder specimens was basically unaffected by temperature changes. The analysis of the bond-slip constitutive relation of the bonded interface shows that as the temperature increases, the maximum bond stress of the resin binder gradually decreases and the corresponding slippage also increases. In contrast, The maximum bond stress and slippage of the geopolymer binder did not change significantly with the increase of temperature, which proves that the bond performance of the geopolymer binder is not sensitive to the test temperature. This shows that geopolymers have good high temperature performance, potential for the development of inorganic binders.