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| Dimension | Key Indicators | Impact |
|---|---|---|
| Water Pressure | Static/dynamic pressure (e.g., tunnels ≥1.5MPa) | Determines impermeability grade |
| Temperature | Long-term operating range (-40°C to +120°C) | Affects material weathering |
| Chemical Media | Exposure to acids, alkalis, oils, or solvents | Dictates corrosion resistance |
| Structural Displacement | Maximum joint movement (e.g., bridge expansion joints ±50mm) | Requires flexibility |
| Installation Space | Joint width/depth (e.g., narrow post-cast strips ≤30mm) | Limits cross-sectional size |
| Rubber Type | Composition | Core Advantages | Typical Applications |
|---|---|---|---|
| EPDM Rubber | Ethylene Propylene Diene Monomer | Excellent weathering (UV/ozone resistance) and water resistance | Water tanks, bridges, tunnels |
| NBR Rubber | Nitrile Butadiene Rubber | Oil/solvent resistance (e.g., diesel, hydraulic oil) | Industrial oil pools, machinery foundations |
| Chloroprene Rubber | Neoprene | Weathering + flame retardancy (OI ≥28) | Subway tunnels, cable trenches |
| Water-swellable Rubber | Hydrophilic rubber | Swells ≥250% to fill gaps upon water contact | Basement floors, construction joints |
| Silicone Rubber | Polysiloxane | High-temperature resistance (-60°C to +200°C) + insulation | Thermal pipelines, high-temperature facilities |
Optimal Choices:
Floors/walls: Water-swellable waterstops (BW-type) with swelling ratio ≥300%, installed in U-shaped grooves.
Deformation joints: EPDM rubber waterstops with steel edges, tensile strength ≥10MPa, adapting to ±20mm displacement.
Avoid Risks: Skip natural rubber (prone to aging); choose cold-resistant types (-30°C non-brittle) for frigid zones.
Optimal Choices:
Drinking water pools: Food-grade EPDM waterstops (compliant with GB 4806.11), Shore A hardness 50±5.
Sewage treatment pools: Chloroprene rubber with fluororubber coating, resistant to pH 3–11 and chloride ion penetration.
Key Parameters: Elongation at break ≥400%, water resistance weight change ≤5% (70°C×168h).
Optimal Choices:
Shield tunnels: Curtain rubber sheets with multi-directional waterstops, compatible with grouting holes, resisting ≥50mm offset.
Mountain tunnels: Wave-shaped rubber waterstops, cross-section height ≥30mm for water pressure self-sealing.
Special Design: Integrate grouting pipes for post-construction pressure grouting.
Optimal Choices:
Expansion joints: Modified asphalt rubber waterstops, tensile modulus ≤0.4MPa, adapting to ±80mm displacement.
Support nodes: Silicone rubber with stainless steel plates, 20+ years of weathering resistance, ozone crack grade 5.
Testing Requirements: Pass 1 million fatigue cycles (amplitude ±20mm); UV aging tensile strength retention ≥80%.
Optimal Choices:
Oil storage areas: NBR rubber with PTFE veneer, gasoline/diesel immersion volume change ≤10%.
High-temperature workshops: Silicone rubber waterstops (Shore A 60±5), resistant to 150°C long-term exposure.
Extra Protection: Apply epoxy primer to enhance chemical barrier.
Define the Scenario: Identify the project type (underground/industrial/open-air) and environmental parameters (pressure/temperature/media).
Calculate Displacement: Measure maximum joint deformation (tension/compression/shear) to determine allowable waterstop flexibility.
Screen Materials: Match rubber types to environmental factors (refer to the table above), eliminating incompatible options.
Verify Performance: Key tests include:
Hydrostatic pressure resistance (≥1.5× actual pressure)
Aging resistance (hot air aging strength retention ≥70%)
Joint adaptability (≥5,000 cycle simulation tests)
Ensure Installation Fit: Confirm waterstop cross-section (rectangular/trapezoidal/wave) matches site space.
