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选用-5℃时具有较低粘度的环氧树脂GCC135,研究了稀释剂501、692、促进剂DMP-30、偶联剂KH-550及硅微粉用量对环氧树脂GCC135性能的影响,制备了低温固化型环氧基混凝土裂缝(宽度1.5~3 mm)注浆料。结果表明,当m(环氧树脂GCC135)∶m(固化剂593)∶m(稀释剂501)∶m(稀释剂692)∶m(促进剂DMP-30)∶m(偶联剂KH-550)∶m(消泡剂B-313)∶m(硅微粉)=100∶35∶5∶5∶1.5∶1.5∶0.5∶30时,制备的注浆料的综合性能最优。粘度为1 380 m Pa·s,适用期为85 min,7 d压缩强度为70 MPa,7 d弯曲强度为33MPa,呈非碎裂破坏,7 d钢对钢粘结剪切强度为20 MPa,7 d钢对混凝土拉伸度为3.8 MPa,呈混凝土内聚破坏。满足GB/T 50728—2011《工程结构加固材料安全性鉴定技术规范》对低温固化型环氧基混凝土裂缝注浆料的性能要求。
The epoxy resin GCC135 with lower viscosity at -5 ℃ was chosen to study the influence of diluent 501,692, accelerator DMP-30, coupling agent KH-550 and the amount of silica powder on the properties of epoxy resin GCC135. Low temperature curing epoxy concrete cracks (width 1.5 ~ 3 mm) grouting material. The results show that when m (epoxy GCC135): m (curing agent 593): m (diluent 501): m (diluent 692): m (accelerator DMP-30) ): M (defoamer B-313): m (silica fume) = 100: 35: 5: 5: 1.5: 1.5: 0.5: 30, the prepared grout has the best overall performance. The viscosity is 1 380 mPa · s, the pot life is 85 min, the compressive strength at 7 d is 70 MPa, the flexural strength at 7 d is 33 MPa, In 7 days, the tensile strength of steel to concrete was 3.8 MPa, which showed cohesive failure of concrete. To meet the GB / T 50728-2011 “Engineering Structural Reinforced Materials Safety Technical Specification” for low temperature curing epoxy concrete crack grouting performance requirements.