CGM polymer cement slurry injection I. Introduction CGM material is a polymer cement slurry injection with high-strength cement, polycarboxylate based superplasticizer, multi-mineral materials as the main component modified cement-based grout material with good liquidity, micro-expansion, there is a certain toughness, strong bond with the concrete, corrosion and durable, suitable for concrete structures crack width greater than 3mm above perfusion repair cracks and outsourcing steel reinforcement. Second, the performance indicators in Table 1 polymer cement slurry injection performance test item performance test method 1 Appearance powder, no lumps visual 2 Setting time (h: min) Initial setting ≥1: 00 DL / T 5 126 -2001 final setting ≤12: 00 3 fluidity (mm) initial value ≥340 GB / T 50448-2008 30min retention values ??≥300 4 compressive strength (MPa) 28d ≥40 DL / T 5 126-2001 GB50367-2006 5 flexural strength (MPa) 28d ≥10 6 splitting tensile strength (MPa) 28d ≥5 GB50367-2006 Appendix G 7 positive and concrete tensile bond strength (MPa) 28d ≥2.5, and for concrete cohesion destruction GB50367- 2006 Appendix F