Erosion Mat Technical Properties

Technical data for the Australian Concrete Erosion Mat Manufacturing Materials, Performance and Specifications.

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Manufacturing and Design Specifications of Concrete Mats

Manufacture and Supply

  • ​The manufacturing process is done in a controlled environment in our purpose built factory in Northern New South Wales.
  • We deliver our products throughout Australia.
  • Australian Concrete Mats ensure a consistent quality of concrete.
  • The concrete shapes are extruded in a method that ensures a uniform and consistent shape.
  • The geogrid material is evenly embedded into the concrete shapes.
  • Because of our efficient manufacturing processes, ACM can extrude and manufacture the mats in lengths of 6/8/10/12 and 15m lengths..

Concrete Mats

Australian Concrete Mats are manufactured from individual concrete blocks interlocked together with a UV stabilised high strength Polyester Bi-Axial Geogrid. Each block is tapered, bevelled, and interlocked that prevents lateral displacement of the blocks within the mats when they are lifted for placement. Australian Concrete Mat are supplied with a Geotextile Underlay. They are supplied in two variations, firm or flexible. With or without the excess concrete removed between the concrete shapes.

BLOCKS
The furnished blocks are manufactured with concrete conforming to the cement requirements of AS 3600 and to the aggregate requirements of AS 2758. Blocks shall have a minimum weight of 0.75kg per block and placed no further than 40mm apart. Material weight per square meter shall not exceed 45kg. Blocks shall have a 58mm profile, a flat-top pyramid shape, and a coarse finish without protrusions. Concrete shall have a minimum compressive strength requirement of Table 1 and certified by a third party.

GEOGRID – POLYESTER BI-AXIAL GEOGRID
Manufactured from high-modulus, high strength, and long polyester fibres, that are warp-knitted, bundled together and coated with UV resistant PVC to form high tensile, multifilament polyester yarns. They are designed to resist degradation in environments with exposure to water and low pH (,4 pH) and high pH (>9 pH).
When combined with the revetment mat, this will yield a high tenacity, low elongating, and continuous filament polyester geogrid that is embedded within the base of the concrete blocks. UV Resistance to AS3706.11

UNDERLAYMENT MATERIALS.
Available with the following underlay:

  • 200GSM BIODEGRADBLE NUTRITION GEOTEXTILE UNDERLAY CLOTH
  • 200GSM FILAMENT NON-WOVEN GEOTEXTILE UNDERLAY CLOTH
  • 400GSM FILAMENT NON-WOVEN GEOTEXTILE UNDERLAY CLOTH

SHIPMENT
Mats will be rolled for shipment. Upon delivery, rolls may be left exposed for up to 30 days. If exposure will exceed 30 days, cover or tarp the rolls to minimize UV exposure.

PERFORMANCE
Full-Scale laboratory testing performed by an independent third-party testing facility with associated engineered calculations certifying the hydraulic capacity of the proposed Flexible Concrete Mat meets the following requirements:

EQUIPMENT
Provide the proper equipment to place the mat that will not damage the mat material or disturb the soil subgrade and seed bed.

CONSTRUCTION
Prior to installing Australian Concrete Mats, prepare the subgrade as detailed in the plans. All subgrade surfaces to be smooth and free of all rocks, stones, sticks, roots, and other protrusions or debris of any kind that would result in an individual block being raised more than 20mm above the adjoining blocks. When seeding is shown on the plans, provide subgrade material that can sustain growth. Ensure the prepared subgrade provides a smooth, firm, and unyielding foundation for the mats. The subgrade shall be graded into a parabolic or trapezoidal shape to concentrate water flow to the middle of mat or mats. Install mats to the line and grade shown on the plans and per the engineers’ requirements. When vegetation is required, distribute the seed on top of the Geofabric cloth. Cover with topsoil and water.
The engineer or authorised representative will provide technical assistance during preparation and installation of the concrete block mats as needed. Provide a minimum 450mm deep concrete mat embedment toe trench at all edges exposed to concentrated flows. Recess exterior edges subject to sheet flow a minimum of 150mm. Provide fastening or anchoring as recommended by the engineer for the site conditions.

MEASUREMENT
This Item will be measured by the square Metre or Linear metre.

ANCHORING
Anchoring is to be designed by an engineer for the water flow rates, soil and site conditions.
Note: The Australian Concrete Mat Installation Guide, is only a Guide as each site has differing parameters.

Manufacturing Material Information

MATERIALVALUES
CONCRETE MIX6% Air entrained with 8mm Aggregate
POLYESTER GEOGRID MATERIAL40/40 mm Aperture Polyester Geogrid
Ultimate Tensile Strength (ASTM D6637)
• Longitudinal 50KN/m
• Transverse 50kN/m

Manufacturing Values

AUSTRALIAN CONCRETE MATFLEXIBLE CONCRETE MATFIRM CONCRETE MAT
Roll Width2.4m2.4m
Roll Length6m/8m/10m/12m/15m rolls. Over 15m by Custom Order6m/8m/10m/12m/15m rolls. Over 15m by Custom Order
Material Weight (Approx)45 kg per m250 kg per m2
Block Size (Approx)160mm x 148mm x 58mm160mm x 148mm x 58mm
Spacing between blocks40mm40mm

Performance Data and Testing Certification

Performance Data

TESTRESULTS
Data report showing the following key properties
Critical flow sheer stress for initiation of scour1.149 kPa (24+ psf)
Maximum flow velocity5.79 m/s (19+ fps)
Mannings' n0.05
It should be noted that the critical shear and flow velocity values were estimated by extrapilation, and it is possible that the actual values may have been slightly higher

Testing Certification

Download the engineers certification of Australian Concrete Mat Performance Data.

UNSW WATER LAB TESTING

Download the report from the UNSW Water Research Laboratory for Hydraulic Performance testing of a Concrete Mattress from Australian Concrete Mat.

“The concrete mattress provided “macro-roughness” to the channel. Flows over the concrete mattress resulted in bubbly, aerated flow with a significant increase in flow depth (approximately 1.5 times)and a substantial decrease in depth average flow velocity (between 30 – 60%) when compared to flow over artificial turf. (unlined channel)”

UNSW Water Lab Report

Concrete Mats and Rolls Specifications

Concrete Mat and Roll Specifications

Rolls are supplied in 2.4m wide in lengths up to 15m. Longer lengths can be made as custom orders.

MAT LENGTH 6M ROLL
(2.4m wide)
8M ROLL
(2.4m wide)
10M ROLL
(2.4m wide)
12M ROLL
(2.4m wide)
15M ROLL
(2.4m wide)
********FLEXIBLE MATS********************************
Weight (kg)648 kg864 kg1080 kg1296 kg1600 kg
Mats per semi truckload (24 tonne)37 Rolls27 Rolls22 Rolls18 Rolls15 Rolls
********FIRM MATS********************************
Weight (kg)720 kg960kg1200 kg1440 kg1800 kg
Mats per semi truckload (24 tonne)33 Rolls25 Rolls20 Rolls16 Rolls13 Rolls
Lifting Points/Straps2 x Straps2 x straps2 x lifting straps 2 x lifting straps2 x lifting straps
Diameter of Each Roll (cm) Approx 40 cmApprox 55 cmApprox 72 cmApprox 80 cmApprox 90 cm

Technical Drawings for Various Projects

Click to download Technical Drawings for erosion control, stabilisation and rehabilitation projects

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