Fast‑reacting PU injection grout for sealing leaks, filling voids and stabilizing slabs—ready for airport runway rapid repair.
Summary Benefits at a Glance
Rapid turn‑around – adjustable gel time; typical reopen 30–120 min (site‑dependent).
High expansion – free‑rise expansion 1–25× efficiently fills irregular voids.
Closed‑cell, durable – low water uptake, frost resistance ≥F200, stable at −30 to 80 °C.
Undersealing support – stabilizes slabs and mitigates pumping/rocking in runway/roadway panels.
Product Introduction
Our two‑component Polyurethane Injection Grout is designed for rapid water cut‑off, crack sealing, void filling and slab undersealing in concrete and masonry structures. The A/B components react to form a closed‑cell foam/solid with adjustable gel time and high expansion, enabling fast reinstatement of service on critical infrastructure. The cured grout shows low water uptake, frost resistance (≥F200) and dimensional stability at low and elevated temperatures (−30 °C / 80 °C). Typical applications include tunnels, manholes, basements, pavements and airport runway/ taxiway undersealing for rapid return to traffic. Supplied as matched components for two‑component proportioning equipment.
Product Parameters
| Item | Typical Value |
| System | Two‑component PU injection grout |
| A‑Component Viscosity (25 °C) | ≤ 0.5 Pa·s |
| A‑Component Density (25 °C) | 1.22–1.25 g/cm³ |
| B‑Component Viscosity (25 °C) | ≤ 1.0 Pa·s |
| B‑Component Density (25 °C) | 1.0–1.2 g/cm³ |
| Reaction Start / Finish (25 °C) | 10 ± 5 s / 50 ± 20 s |
| Free‑Rise Density | ≥ 50 kg/m³ |
| Free‑Rise Expansion Ratio | 1–25× |
| Dimensional Stability (−30 °C / 80 °C) | ≤ 0.5 % / ≤ 1.5 % |
| Compressive Strength (foam core) | ≥ 0.60 MPa |
| Frost Resistance | ≥ F200 |
| Typical Return to Service | 30–120 min (depends on temperature, load and acceptance criteria) |
| Storage / Shelf Life | 5–30 °C; unopened 12 months |
Product Usage
Where it's used?
Crack injection & water cut‑off in basements, tunnels, culverts, manholes and below‑grade structures.
Void filling & soil contact gaps, including behind retaining walls and around utilities (engineered design required).
Slab undersealing & stabilization for pavements, industrial floors and bridge decks.
Airport runway/taxiway undersealing – injection beneath PCC slabs to fill voids, mitigate pumping/rocking and restore load transfer with minimal closure time for rapid return to service.
How to apply (overview)
Drill packer holes per injection plan; install packers; inject from low to high elevation until refusal/criteria met.
Monitor slab lift during undersealing and keep within allowable tolerances.
Seal ports and protect the work; reopen only after acceptance checks.
Temperature guidance:
Cold (< 5 °C) – extend reaction time; insulate/heat components and substrate as needed.
Normal (5–30 °C) – standard controls.
Hot (> 30 °C) – manage equipment cooling and shorten gel time accordingly.
Runway works: enforce FOD control, protect lighting/drainage, and meet airfield acceptance specs prior to reopening.
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Our products have undergone rigorous testing at our national testing laboratory (CABR testing center co., ltd). Renowned Fortune Global 500 firms such as China Railway Group Limited, China Communications Construction Company Limited, and Sinohydro are among our esteemed clients.
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