Uniform Section Mat (USM)
Uniform Section Mat (USM) is formed with a double-layer woven fabric, joined together by spacer cords on closely spaced centers to produce a mat of uniform thickness. Similar to traditional concrete slope paving, USM creates a solid, high-quality concrete lining with a low hydraulic resistance for use in various lining and erosion resistance applications.
Uniform Section Mat (USM) form a lining of required nominal thickness, bonded cobbled surface and specified weight to provide strength and erosion protection to resist the calculated tractive forces. The design criterion for selection of lining thickness is the same as that used to determine the thickness of conventional concrete slope paving. Relief of hydrostatic uplift pressure may be provided by inserting plastic weep tubes through the mat at specified centers. USM is custom fabricated into multiple mill width panels, designed to fit actual site dimensions and topography.
- USM is used where velocities are low to high, bedload and ice formations are light and a roughness coefficient of N=0.015 is required.
- USM reduces seepage losses in reservoirs, ponds, holding basins and channels.
- USM is recommended for drainage flumes and spillways.
- USM should be installed on engineered slopes.
|UNIFORM SECTION MAT (USM)|
|STYLE||NORMAL THICKNESS||UNIT WEIGHT||CONCRETE COVERAGE|
|3” FPM||3.0”||35 lbs./ft²||97 sq. ft./cy|
|4” FPM||4.0”||47 lbs./ft²||73 sq. ft./cy|
|6” FPM||6.0”||70 lbs./ft²||49 sq. ft./cy|
|8” FPM||8.0”||93 lbs./ft²||36 sq. ft./cy|
|10” FPM||10.0”||115 lbs./ft²||28 sq. ft./cy|
|12” FPM||12.0”||136 lbs./ft²||22 sq. ft./cy|
- Bridge Abutments
- Storm Sewer Outfalls
- Channel Lining
- Geomembrane Ballast/ Protection
- Flood Control
- Industrial Waste Landfill
- Oil/Gas Pipeline
|MATERIAL PROPERTY – ARMORFORM FABRICS|
|Composition of Yarns||-||-||Polyester|
|Mass Per Unit Area (Double-Layer)||ASTM D 5261||oz/yd²||14|
|Thickness (Single-Layer)||ASTM D 5199||mils||27|
|Mill Width (Woven)||inch||72|
|Wide-Width Strip Tensile Strength - WARP | FILL||ASTM D 4595||lbs./inch||340/270|
|Elongation at Break - WARP | FILL - Max.||ASTM D 4595||%||12/12|
|Trapezoidal Tear Strength - WARP | FILL||ASTM D 4533||lbs.||180/170|
|Grab Tensile Strength||ASTM D4632||lbf||364/310|
|Grab Tensile Elongation||ASTM D4632||%||25/21|
|CBR Puncture Strength||ASTM D 6241||lbs.||1575|
|Apparent Opening Size (AOS)3||ASTM D 4751||U.S. Standard (mm)||20|
|Flow Rate||ASTM D 4491||gal/min/ft²||125
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