Tunnel linings, shotcrete, and gunite applications demand materials that perform under pressure, moisture, ground movement, vibration, and complex site conditions. Cracks in underground concrete systems can affect durability, water tightness, and service life.
Glassman AR Glass Fibres by DD Solutions help improve sprayed and placed concrete by controlling micro-cracks, reducing permeability, improving surface integrity, and supporting long-term durability. For tunnels, shotcrete, and gunite applications, Glassman acts as a distributed micro-reinforcement system within the concrete matrix.
Tunnel Linings & Shotcrete?
Underground concrete needs more than strength. It needs crack control, water resistance, durability, and clean surface performance. Glassman AR Glass Fibres help reinforce the sprayed concrete layer throughout the matrix, improving micro-crack control and reducing pathways for water ingress.
Because the fibres are non-corrosive and surface-friendly, they are useful in tunnel environments where moisture exposure and durability are major concerns.
Key Benefits
Typical Applications
- Tunnel linings
- Metro and subway
- Utility tunnels
- Mining access shafts
- NATM shotcrete linings
- Tunnel portal protection
- Underground concrete works
- Tunnel-related precast elements
- Gunite applications
Usage & Mixing Guildlines
- Use with approved wet-mix shotcrete, dry-mix gunite, or concrete
- Add fibres during final mixing
- Ensure complete dispersion before application
- Validate pumpability or spray ability before full-scale execution
- Conduct trial panels for rebound finish, cohesion, and crack-control
Quality Standards
- Spray ability and pumpability review
- Trial panel testing
- Compatibility review with admixtures and accelerators
- Glassman AR Glass Fibres are relevant to fibre-reinforced concrete and cement applications under ASTM C1666/C1666M, which covers alkali-resistant glass fibre for GFRC, fibre-reinforced concrete, and cement applications. ASTM C1116/C1116M also classifies glass fibre-reinforced concrete as Type II fibre-reinforced concrete containing alkali-resistant glass fibres.
Recommended Fibre Types
Glassman AR Glass Fibre – 12mm
Suitable for general shotcrete, mortar, lining, and repair applications.
Glassman AR Glass Fibre – 16mm
Suitable for thicker sections requiring stronger crack-control support, subject to site trials.
Suggested Dosage
0.5 kg to 1.0 kg per m³ of concrete
Final dosage should depend on tunnel application, shotcrete process, layer thickness, equipment compatibility, and project specifications.
Technical Note
Recommended dosage and fibre length should always be finalized based on the application, mix design, site conditions, and trial results.
For structural replacement of steel reinforcement, project-specific validation by a qualified engineer is required.