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.,,4 ENGINEERING FABRICS SECTION 88 ENGINEERING FABRICS 88-1.01 Description.—Engineering fabrics consisting of pavement reinforcing fabric and filter fabric shall conform to the requirements in this Section 88, "Engineering Fabrics." Engineering fabrics shall be placed in accordance with the various sec- tions of these specifications requiring the use of an engineering fabric or as specified in the special provisions. A Certificate of Compliance for each kind of engineering fabric used on the project shall be furnished to the Engineer in accordance, with the provisions in Section 6-1.07, "Certificates of Compliance." Engineering fabrics shall be furnished in protective covers capable of protecting the fabric from ultraviolet rays, abrasion, and water. 88-1.02 Pavement Reinforcing Fabric.—Pavement reinforcing fabric shall be manufactured from polyester, polypropylene, or polypropylene- nylon material. The fabric shall be nonwoven, and shall conform to the following: Weight,ounces per square yard ASTM Designation: D 1910...................................................................................... 3.0 to 8.0 Grab tensile strength (1-inch grip),pounds,min. ASTM Designation: D 1117...................................................................................... 90 Elongation at break,percent,min. ASTM Designation: D 1117...................................................................................... 40 Fabric thickness, mils. ASTM Designation: D 461........................................................................................ 12 to 100 88-1.03 Filter Fabric.—Filter fabric shall be manufactured from polyes- ter, nylon, or polypropylene material, or any combination thereof. The fabric shall be nonwoven,shall not act as a wicking agent,shall be permea- ble, and shall conform to the following: For For Edge Drains Underdrains Weight,ounces per square yard,min. ASTM Designation: D 1910 ................................................ 4.0 4.0 Grab tensile strength (1-inch grip),pounds,min."' ASTM Designation: D 1682 ................................................ 50 90 Elongation, percent,min. ASTM Designation: D 1682 ................................................ 10 30 Toughness,pounds,min. (Percent elongation x grab ten- silestrength) ...................................................................... 3000 4000 Permittivity, 1/sec.,min. ASTM Designation: D 4491 ................................................ 0.5 0.5 "'In each direction. 88-1.04 Measurement and Payment.—Engineering fabrics will be measured and paid for in accordance with the provisions specified in the various sections of these specifications requiring the use of an engineering fabric or as specified in the special provisions. (88-1)