T/GDCAA 007-2023 polyurea grouting material

Scope

Main technical content: The appearance of the product is a uniform viscous substance without gels or clumps. The performance of the slurry of polyurea grouting materials shall comply with the requirements of Table 1. **Table 1: Requirements for Slurry Performance** **Item** **Unit** **Requirements** **Type I** **Type II** Solid content ≥90.0% ≥95.0% Viscosity (mPa·s) ≥5000 ≥8000 Drying time Dry time (h) ≤4 Full dry time ≤6 **Table 2: Requirements for Cured Body Performance** **Item** **Unit** **Requirements** **Type I** **Type II** Bonding strength Dry substrate ≥1.0 MPa ≥2.0 MPa Wet substrate ≥0.8 MPa ≥1.5 MPa Tensile strength ≥2.0 MPa ≥2.0 MPa Elongation at break ≥300% ≥450% Elastic recovery rate ≥90% ≥95% Low-temperature bending -35°C, no cracks -45°C, no cracks Water absorption ≤1.0% Waterproofness -0.3 MPa, 120 min no water penetration Peel-off adhesion Peel-off strength (N/mm) ≥2.50 Internal cohesion failure area 100% Heat treatment (80°C, 168 h) Tensile strength retention rate ≥80% Elongation at break ≥400% Alkali treatment (0.1% NaOH + saturated Ca(OH)2 solution, 168 h) Tensile strength retention rate ≥80% Elongation at break ≥400% Acid treatment (2% H2SO4 solution, 168 h) Tensile strength retention rate ≥80% Elongation at break ≥400% Salt treatment (3% NaCl solution, 168 h) Tensile strength retention rate ≥80% Elongation at break ≥400% **Harmful Substances Limits for Polyurea Grouting Materials** The harmful substances limits for polyurea grouting materials shall comply with the requirements of Table 3. **Table 3: Harmful Substances Limits** **Item** **Unit** **Limit Value of Harmful Substances** VOC (Volatile Organic Compounds) g/L ≤50 Benzene mg/kg ≤200 Toluene + Ethylbenzene + Xylene g/kg ≤5.0 Phenol mg/kg ≤100

Development Information

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