805Geotextiles, Membrane, and Fabrics

Geotextiles, Membrane, and Fabrics

805.1General

1 When storing, keep geotextile, membrane, and fabric rolls wrapped for protection against moisture, weather, and extended ultraviolet exposure. Elevate the rolls and protect with a waterproof cover. Label or tag each roll to provide product identification sufficient for inventory and quality control.

805.2Geotextile and Impermeable Plastic Membrane

1 Provide impermeable plastic membrane consisting of a polypropylene, polyethylene, or polyester geotextile with a bonded polypropylene or polyethylene film.

2 In the manufacture of woven or nonwoven geotextiles and threads used in joining geotextiles by sewing, use fibers consisting of long-chain synthetic polymers, composed of at least 95 percent, by weight, of polyolefins or polyesters. Form fibers into a stable network while retaining their dimensional stability relative to each other, including selvages. Provide both in accordance with Table 805.2-1, Geotextile and Membrane Requirements (Minimum Average Roll Values), as applicable for the specified use.

3 Clearly label each roll with the product name, type of material, and the lot or batch identification.

4 Use high-strength polyester, polypropylene, or Kevlar thread for sewn seams; do not use nylon.

Geotextiles, Membrane, and Fabrics SECTION 805

Table 805.2-1 Geotextile and Membrane Requirements (Minimum Average Roll Values(1)) Fabric and Membrane Property Test Method Drainage & Filtration Erosion Control Silt Fence Separation & Stabilization (Non-Woven) Embankment & Retaining Wall Reinforcement Impermeable Plastic Membrane Subgrade Reinforcement PERFORMANCE CRITERIA DURING SERVICE LIFE Equivalent or Apparent Opening Size, US Standard Sieve, in [mm] ASTM D4751 [0.425-0.150] [0.425-0.150] [0.850-.300] [0.425-0.150] [0.600-0.300] – 30-50 [0.600-0.300] Thickness, mils [mm] ASTM D5199 – – – – – 12 [0.305] – Permittivity, Sec-1 ASTM D4491 1.0 1.0 0.05 1.0 0.40 <10 7 cm/sec (2) 0.20 STRENGTH REQUIREMENTS Wide Width Tensile Strength, Ultimate, lbs/ft [kN/m] ASTM D4595 – – – – 2400 [35] – 3200 [47] Wide Width Tensile Strength @ 5% strain, lbs/ft [kN/m] ASTM D4595 – – – – 1000 [14.6] – 1300 [19] Grab Tensile Strength, lb [N] ASTM D4632 100 [445] 180 [800] 100 [445] 160 [710] 250 [1110] 150 [665] 320 [1400] Elongation at Failure, min., % ASTM D4632 50 50 15 50 10 15 10 Trap Tear Strength, lb [N] ASTM D4533 45 [200] 70 [310] 50 [220] 60 [270] 90 [400] 50 [220] 112 [500] Puncture Strength, lb [N] ASTM D6241 60 [265] 90 [400] 50 [220] 85 [380] 495 [2200] 60 [265] 618 [2750] Seam Efficiency, % ASTM D4632 90 90 90 90 90 – 90 ENVIRONMENTAL REQUIREMENTS Ultraviolet Resistance, % Strength Retention after 500 hours of exposure ASTM D4355 50 70 80 50 50 50 50

weakest principal direction (i.e., average test results of any roll in a lot sampled for conformance or quality assurance testing has to meet or exceed the minimum values provided herein).

calendar days.

Geotextiles, Membrane, and Fabrics SECTION 805

805.3Paving Fabric

1 Provide and use material in accordance with AASHTO M 288, table 8. Ensure the material has a minimum asphalt retention of 0.2 gal/yd2 [0.90 L/m²]. When submitting the certification for the paving fabric, include notarized test results for grab strength, ultimate elongation, and weight [mass] per unit area for samples taken from the lot delivered to the project. Take the number of test samples specified in procedure A of ASTM D 4354. A production lot is defined in ASTM D 4354, section 6.2.1 for an individual roll of fabric.

2 For glass fiber reinforced paving fabr ic, provide composite material that consist of a fiberglass structural grid bonded to a non-woven paving fabric meeting or exceeding the following requirements:

Table 805.3-1 Composite Paving Grid Unit Weight 16 oz/yd2 [0.54 kg/m2 ], min Tensile Strength (ASTM D 4595) 655 lb/ft [11.70 kg/m], min Ultimate Elongation (ASTM D 6637) 3% max Asphalt Retention of Fabric (ASTM D 6140) 0.20 gal/yd [0.9 L/m2], min

805.4Biaxial Geogrids

1 Provide biaxial geogrids that are composed of a synthetic planar structure formed by a regular network of tensile elements with high tensile modulus in relation to the material being reinforced. The aperture, ribs and junctions will permit significant mechanical interlock with the material being reinforced, and with high continuity of tensile strength through ribs and junctions of the structure. Ensure the geogrid will maintain its reinforcement and interlock capabilities under repeated dynamic loads.

2 The biaxial geogrids will be resistant to ultraviolet, biological and/or chemical degradation normally encountered in the material being reinforced. If submitted, multilayered biaxial geogrids must be bonded and not knitted together.

Geotextiles, Membrane, and Fabrics SECTION 805

3 Meet the following requirements for biaxial geogrid below:

Table 805.4-1 Biaxial Geogrids Requirements (Minimum Roll Values) Biaxial Geogrid Property Test Method Biaxial Geogrid Biaxial Geogrid (STIFF) Ultimate Tensile Strength Minimum in MD and CMD ASTM D 6637 850 lb/ft [12.4 kN/m] 850 lb/ft [12.4 kN/m] Tensile Strength at 2% Strain Minimum in MD and CMD ASTM D 6637 275 lb/ft [4.00 kN/m] 275 lb/ft [4.00 kN/m] Aperatures COE Method Modified 70% (nominal) 70% (nominal) Aperature Size (range) Measured 0.5 – 3.0 inches [12.70 – 76.2 mm] 0.5 – 3.0 inches [12.70 – 76.2 mm] Junction Strength Minimum in MD and CMD ASTM D 7737 25 lb/junction [0.11 kN/junction] 600 lb/junction [8.75 kN/junction]