4196.01 A.
B.
GENERAL REQUIREMENTS. Meet the following requirements for engineering fabrics (known as geotextiles): 1.
Permeable, synthetic textile materials suitable for use with soil, rock, or other geotechnical engineering related materials as an integral part of a highway project, structure, or system.
2.
Mildew, rot, insect, and rodent resistant.
3.
Inert to commonly encountered chemicals found in soil.
4.
During all periods of shipment and storage, the fabric is maintained by wrapping in a heavy duty protective covering to protect the fabric from direct sunlight, ultraviolet rays, mud, dirt, dust, and debris.
5.
Free of defects or flaws which significantly affect its physical properties.
Comply with Materials I.M. 496.01 for inspection and acceptance of engineering fabrics. Label each roll of fabric in a shipment with a number or symbol to identify the production run. Meet the following additional fabric requirements for the specific applications: 1.
Silt Fencing.
1) Woven material with a minimum width of 36 inches. 2) Top edge of the fabric hemmed or modified otherwise so that a braided cord or woven belt can be suitably attached for loop tying to fence posts. 3) The cord or belt of minimum tensile strength of 150 pounds. 4) Has the properties listed in Table 4196.01-1.
property requirements shall remain as listed in Table 4196.01-1. Table 4196.01-1: Silt Fencing Fabric Properties Property Value Test Method No.
Grab Strength, dry, minimum average fill direction run direction
100 lbs. 150 lbs.
ASTM D 4632
Ultraviolet Stability (Retained Strength)
70%
ASTM D 4355
Permittivity
0.05
ASTM D 4491
US Sieve No. 30
ASTM D 4751
Apparent Opening Size, maximum
Engineering Fabrics
2.
4196.01
Subsurface Drainage. In subsurface drains, use fabric that: • Is capable of withstanding normal installation stresses, and • Has the properties listed in Table 4196.01-2.
Table 4196.01-2: Fabric for use in Subsurface Drains Property Value Test Method Grab strength, dry, minimum ASTM D 4632 average value in either principal 90 lbs. direction Elongation, dry, minimum average value in either principal 20% ASTM D 4632 direction Permittivity, minimum 0.1 sec-1 ASTM D 4491 Apparent Opening Size, US Sieve No. 40 ASTM D 4751 maximum
3.
Embankment Erosion Control. Under concrete and stone revetment, erosion stone, or gabions used for embankment erosion control, use fabric that: • Is capable of withstanding normal installation stresses, and • Has the properties listed in Table 4196.01-3.
Table 4196.01-3: Fabric for use as Embankment Erosion Control Property Value Test Method Grab strength, dry, minimum average value in either principal 150 lbs. ASTM D 4632 direction Elongation, dry, minimum average value in either principal 20% ASTM D 4632 direction Permittivity, minimum 0.1 sec-1 ASTM D 4491 Apparent Opening Size, US Sieve No. 40 ASTM D 4751 maximum
4.
Asphalt Overlay Fabric.
waterproofing and delay reflective cracking, ensure the fabric: • Is capable of withstanding installation stresses, • Is not damaged by temperatures common to asphalt mixtures, and • Has the properties listed in Table 4196.01-4. Table 4196.01-4: Fabric Placed under Asphalt Mixtures Property Value Test Method
Grab strength, dry, minimum average value in either principal direction
90 lbs.
ASTM D 4632
Elongation, dry, minimum average value in either principal direction
20%
ASTM D 4632
4196.01
Engineering Fabrics
Grab Strength after 400°F for 3 hr.(a) minimum average value in either principal 75 lbs. ASTM D 4632 direction
b.
c.
5.
Ensure asphalt absorption is sufficient to produce a good bond between the overlay and the overlaid surface when a tack coat of 0.20 gallon to 0.25 gallon of asphalt binder per square yard is used. The Engineer may approve fabrics, such as fiberglass, which do not lend themselves to testing by some of the previously specified methods.
Subgrade Stabilization Material.
material that: • Is capable of withstanding installation stresses, and • Has the properties listed in Table 4196.01-5a or 4196.01-5b. Table 4196.01-5a: Fabric for use as Subgrade Stabilization (Biaxial Polymer Grid) Property Value Test Method
Minimum tensile strength at 2% strain. Both directions.
250 lbs./ft.
ASTM D 6637
Aperture size. Both directions.
0.5 to 2 in.
Internal Dimension Measuring Calipers
Minimum Ultimate junction strength. Both directions.
790 lbs./ft.
GRI Test Method GG2 or ASTM D 7737
Table 4196.01-5b: Fabric for use as Subgrade Stabilization (Triaxial Polymer Grid) Property Value Test Method Minimum radial stiffness at 0.5% strain 13,700 lbs./ft. or ASTM D 6637 or 12,000 lbs./ft. Minimum tensile modulus at 2% strain Minimum isotropic stiffness ratio
0.60
ASTM D 6637 (a)
Aperture size.
0.5 to 2 in.
Internal Dimension Measuring Calipers
Minimum junction efficiency
90%
ASTM D 6637/D 7737
strain, measured on rib and midway between rib directions.
b.
Inspection and acceptance of polymer grid will be according to Materials I.M. 496.01.
Engineering Fabrics
6.
4196.01
Bridge Abutment Backfill Fabric. Use engineering fabric having properties listed in Table 4196.01-6.
Table 4196.01-6: Fabric for use in bridge abutment backfill Property Value Test Method Tensile Strength (at 5% Strain), 1356 lbs/ft ASTM D 4595 minimum Apparent opening size (AOS), US Sieve No. 40 ASTM D 4751 maximum UV resistance (at 500 hours)
70% retained strength
ASTM D 4355
Flow Rate, minimum
10 gal./min./ft2
ASTM D 4491