Standard Grouted Mattress
GRI GT16-compliant grouted mattress (GGFM) — also specified as articulated concrete mattress (ACM), fabric formed concrete, or concrete erosion control mat. Installs without dewatering. 50–200 mm. Ships in 48 hours.
Third-party GRI GT16 test reports - ISO 17025 lab - BOQ template included with every order
Quick Answer
A grouted mattress (Geotextile Grout-Filled Mattress, GGFM) is a flexible concrete erosion protection system. Two layers of woven polypropylene geotextile are stitched into a grid, laid flat on any surface — slopes, canal beds, or underwater — then filled with cement grout through a standard pump truck. It installs without dewatering, conforms to the exact profile of the subgrade, and reaches ≥17 MPa compressive strength at 28 days. GRI GT16-compliant. Design life: 50+ years.
What Is a Standard Grouted Mattress?
A standard grouted mattress consists of two layers of woven polypropylene geotextile stitched together in a grid pattern. The fabric rolls out flat on any surface — slopes, canal beds, or underwater — and is then filled with fine-aggregate cement grout via a standard pump truck.
The result is a rigid, articulated concrete armour that follows the exact profile of the subgrade — no formwork, no dewatering, no specialist plant. The system reaches full design strength (≥17 MPa) at 28 days and has a design life of 50+ years.
What Does a Grouted Mattress Look Like In the Field?
What Are the Technical Specifications?
Full datasheet and GRI GT16 test certificates available on request.
| Parameter | 50 mm | 100 mm | 150 mm | 200 mm |
|---|---|---|---|---|
| Design Velocity (max) | 2.5 m/s | 3.5 m/s | 4.5 m/s | 6.0 m/s |
| Compressive Strength | ≥17 MPa | ≥17 MPa | ≥17 MPa | 20 MPa |
| Unit Weight (filled) | 110 kg/m² | 220 kg/m² | 330 kg/m² | 440 kg/m² |
| Panel Width | Up to 6 m | Up to 6 m | Up to 6 m | Up to 6 m |
| Panel Length | Up to 30 m | Up to 30 m | Up to 30 m | Up to 30 m |
| Fabric Standard | GRI GT16 | GRI GT16 | GRI GT16 | GRI GT16 |
| Grout Mix (w/c ratio) | 0.45–0.50 | 0.45–0.50 | 0.42–0.48 | 0.40–0.45 |
| Curing Time (28-day) | 17 MPa | 17 MPa | 17 MPa | 20 MPa |
| Typical Application | Irrigation canals | Canal lining, slopes | River training | Bridge scour, coast |
Where Is Grouted Mattress Used?
Canal Lining
Irrigation, drainage, and water conveyance channels. Installed without stopping flow.
Slope Protection
Highway embankments, river levees, and reservoir slopes. Follows curved and irregular profiles.
River Bank Armour
Bank and bed protection for river training, flood control, and sediment management schemes.
Bridge Pier Scour
Underwater collar protection around bridge and pipeline crossings. Installed without dewatering.
Coastal Revetments
Tidal and wave erosion protection. Filter point variant available for artesian uplift conditions.
Reservoir Facing
Upstream face of earthen dams and reservoir embankments. Long-term wave action resistance.
How Is Grouted Mattress Installed?
Subgrade Preparation
Grade to -30 mm of design profile. Remove stones > 50 mm. Install separator geotextile where CBR < 3%.
Panel Layout & Anchoring
Unroll panels from top of slope downward. Overlap adjacent panels by 300 mm minimum. Pin top edge at 2 m centres.
Grout Injection
Connect pump hose to bottom injection port. Pump at 15–25 m²/hour. Move injection point at 1 m intervals along the panel.
Curing & Inspection
Mist with water within 30 minutes of completion. Maintain damp for 7 days. Take grout cubes at 1 set per 50 m².
How Does Grouted Mattress Compare to Rip-Rap and Concrete Panels?
| Criterion | Grouted Mattress | Rip-Rap | Concrete Panel |
|---|---|---|---|
| Dewatering required | None | Usually | Always |
| Installation rate | 800–1,200 m²/day | 200–400 m²/day | 100–200 m²/day |
| Typical cost | $25–45/m² | $45–80/m² | $55–90/m² |
| Maintenance | Minimal (50+ yr) | Re-grading required | Joint re-sealing |
| Rock availability needed | No | Yes | No |
| Irregular surfaces | Conforms exactly | Approximate | Poor |
| Underwater install | Yes | Limited | No |
One Manufacturer. One Product. Full Accountability.
Grouted Mattress: Frequently Asked Questions
What is the minimum order quantity?
There is no minimum order quantity. We supply single panels for repair works and multi-million m² for national infrastructure programmes. Unit pricing scales with volume — contact us for a quote based on your project area.
Does the price include the grout?
No. We supply the geotextile mattress fabric; grout is batched on-site using a standard concrete mix (w/c 0.45–0.50, 10 mm aggregate) with a conventional pump truck. We provide the mix design specification with every order at no charge.
What panel sizes are available?
Standard panels are up to 6 m wide and up to 30 m long. Custom widths and lengths to suit your canal cross-section or slope geometry are fabricated within the 48-hour dispatch window at no extra cost.
How long does sea freight take to reach my country?
Typical sea freight transit times from Tianjin port: Southeast Asia 5–12 days, Middle East 18–25 days, East Africa 20–28 days, Europe 28–35 days. Air freight is available for urgent small quantities. Contact us with your destination port for a landed cost estimate.
Can I get a sample panel before placing an order?
Yes. We can send a 500 mm - 500 mm fabric sample (unfilled) by courier for material evaluation. Request via email to james@concretemattress.com with your delivery address.
Do you provide installation support?
Yes — engineering support is included on all qualified orders. This covers grout mix design, installation method statement, crew briefing, and on-site supervision upon request. See our Engineering Support page for details.
“We specified GRI GT16 compliance as a hard requirement. HydroBase submitted third-party test certificates before we even asked — that level of documentation readiness made the approval process straightforward.”
“Lead time was our concern — we had a 6-week window before the dry season closed. HydroBase dispatched within 48 hours of PO confirmation. The mattresses arrived on site with 10 days to spare.”
“James responded to our technical queries on the same day, including a Sunday. The installation guide was clear enough that our local crew required only one day of phone support during grouting.”
Other Grouted Mattress Products
Filter Point Mattress
Drainage relief holes prevent artesian uplift — specified for tidal and submerged applications.
Vegetated Mattress
Open cell structure allows vegetation to grow through the concrete matrix for ecological slopes.
Technical Specifications
Full product datasheets, GRI GT16 test reports, and BOQ templates available on request.