Self Adhesive Polymer Hdpe Waterproof Membrane No Leakage For Civil Air Defense Project
Hdpe Waterproof Membrane For Civil Air Defense Project
Product Introduction
HDPE polymer self-adhesive film waterproof membrane adopts high-density polyethylene as base material, compounded with special self-adhesive layer and release film. Adopting pre-laid reverse-bonding technology, the membrane is pre-laid on bedding layer, and post-poured concrete bonds tightly with adhesive layer, eliminating water channeling between waterproof layer and structural layer. It is a dedicated waterproof material for underground projects.
| No. | Item | Index‑P | |
| 1 | Tensile property | Tensile force/(N/50 mm) ≥ | 600 |
| Tensile strength/MPa ≥ | 16 | ||
| Membrane breaking elongation/% ≥ | 400 | ||
| Phenomenon during stretching | Adhesive layer shall not separate from main material or substrate | ||
| 2 | Nail‑rod tear resistance/N | ≥ | 400 |
| 3 | Puncture‑resistance strength/N | ≥ | 350 |
| 4 | Impact resistance (0.5 kg·m) | No leakage | |
| 5 | Static load resistance | 20 kg, no leakage | |
| 6 | Heat resistance | 80 ℃, 2 h: no slipping, flowing or dripping | |
| 7 | Low‑temperature bending property | Main material:‑35 ℃, no crack | |
| 8 | Low‑temperature flexibility | Adhesive layer:‑25 ℃, no crack | |
| 9 | Oil‑penetration resistance /number of sheets | ≤ | 1 |
| 10 | Water‑channeling resistance (hydraulic gradient) | 0.8 MPa/35 mm, 4 h no water channeling | |
| 11 | Water impermeability (0.3 MPa,120 min) | Water‑impermeable | |
Construction Method
1. Substrate Treatment: Make bedding surface flat, remove sharp debris and stones. No standing water is required; construction is allowed on damp base.
2. Pre-lay Membrane: Lay the membrane with sand-adhesive side towards concrete structure. Spread on bedding layer following layout lines and align membrane laps.
3. Lap Joint Treatment: Remove release film for long-side and short-side laps, bond self-adhesive layers together. Apply reinforcement layers at corners and internal/external angles.
4. Membrane Fixing: Fix and seal membrane ends and laps with pressure strips to prevent displacement.
5. Finished-product Protection: Prevent puncture by sharp objects after laying. Proceed with steel bar binding and concrete pouring timely.
6. Concrete Pouring: Pour post-poured concrete directly on membrane. Concrete will bond tightly with adhesive layer to achieve pre-laid reverse-bonding effect.
Note: For pre-laid application only. Not for exposed use. Hot-melt construction is forbidden.
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