735GEOTEXTILES

735.1GENERAL—From a manufacturer listed in Bulletin 15 and conforming to the following requirements:

polyamide, polyvinylidene-chloride, polypropylene, or polyester formed into a stable network so that the filaments or yarns retain their relative position to each other. Use fabric structures as noted in Table A. Slit film woven fabrics may only be used for Class 3 Geotextiles. Chemically- or thermally-bonded fabrics are not allowed for any class of geotextile. Use fabric inert to commonly encountered construction chemicals or substances. During periods of shipment and storage, protect the fabric from direct sunlight, ultra -violet rays, temperatures greater than 140F, mud, dirt, dust, and debris. To the extent possible, wrap the fabric in a heavy-duty covering or shield from direct sunlight. Geotextiles will be rejected at the time of installation if any defects, deterioration, or damage was incurred during manufacture, transportation, or storage.

manufacturer and on testing by Laboratory Testing Section (LTS).

on the fabric or its container with the manufacturer's name, fabric type or trade name, lot number, and material quantity.

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TABLE A Geotextile Physical Requirements(1) (2)

Fabric Properties Test Method Construction Class Class 1 Class 3 Class 4 Subsurface Drainage Sediment Control Separation and Erosion Control Stabilization and GRS Abutments Type A Type B Type A Type C Fabric Structure N/A Woven Monofilament Woven Slit Film Woven Slit Film Non-woven Needle Punched Woven Polypropylene Weight, oz/sy ASTM D5261 N/A N/A N/A 12.0 min N/A Grab T ensile Strength, lbs.(3) ASTM D4632 365 min MD x 190 min XD 185 min MD and XD 115 min MD and XD 305 min MD and XD N/A Grab T ensile Elongation, %(3),(5) ASTM D4632 22 to 34 MD x 9 to 26 XD 13 to 31 MD and XD 13 to 31 MD and XD 50 min MD and XD N/A Ultimate Wide Width T ensile Strength, lb/ft ASTM D4595 N/A N/A N/A N/A 4,800 min MD and XD Wide Width Tensile Strength @ 2% Strain, lb/ft ASTM D4595 N/A N/A N/A N/A Design Specific(4) Puncture, lbs. (2-in flat- end rod) ASTM D6241 660 min 700 min 440 min 830 min 1,700 min Trapezoid Tear Strength, lbs. ASTM D4533 95 min MD x 75 min XD 70 min MD and XD 50 min MD and XD 110 min MD and XD 170 min MD and XD Apparent Opening Size, mm (Sieve No.) ASTM D4751 0.30 to 0.60 (No. 50 to No. 30 sieve)(5) 0.21 to 0.43 (No. 70 to No. 40 sieve)(5) 0.30 to 0.60 (No. 50 to No. 30 sieve)(5) 0.15 max 0.425 to 0.85 (No. 40 to No. 20 sieve)(5) Percent Open Area, % COE CW-02215 9.0 to 12.0(5) N/A N/A N/A N/A Permittivity, sec-1 ASTM D4491 1.9 min 0.05 min(5) 0.05 min(5) 0.70 min 0.40 min(5) Water Flow Rate, g/min/sf ASTM D4491 130 min N/A N/A N/A 25 min Ultraviolet Resistance Strength Retention, % ASTM D4355 90 @ 500 hrs min 70 @ 500 hrs min 70 @ 500 hrs min 70 @ 500 hrs min 70 @ 500 hrs min Notes:

specimens may have a value less than the required minimum value or greater than the required maximum value (as indicated), except as noted (see Note 5).

strength.

736 – 1