Geogrid shall be in accordance with the property requirements as specified in the Geosynthetic Research Institute, GRI, Standard Test Methods GG1, GG3, GG4, ASTM D5262, and ASTM D6637. The geogrid shall be in accordance with the property requirements for the type specified as follows: 90
Property Test Method Unit Type IA Value, Min. Type IB Value, Min. Aperture Area Calibered Sq. in. 1.3 1.3 Open Area COE, CW02215 % ! ! Junction Strength ASTM D7737 lb/ft ----- 788 Tensile Modulus, machine direction cross machine direction ASTM D6637 1,2,3 lb/ft lb/ft 10,000 10,000 10,000 10,000 Ultimate Strength, machine direction cross machine direction ASTM D6637 2,3 lb/ft lb/ft 800 800 800 800 Ultraviolet St ability ASTM D4355 ----- ----- 70% at 500 hrs 1 Secant modulus at 5% elongation.
2 Results for machine direction, MD, and cross machine direction, CMD, are required.
3 Minimum avera ge roll values shall be in accordance with ASTM D4759.
Property Test Method Unit Value, Min. Open Area COE, CW02215 % ! Tensile Modulus, machine direction ASTM D66371,2 lb/ft 49,300 Ultraviolet Stability ASTM D4355 70% at 500 hrs Creep Limited Strength, machine direction at 5% strain ASTM D5262 lb/ft 1,090 1 Secant modulus at 2% elongation.
2 Minimum average roll values shall be in accordance with ASTM D4759.
PP; or polyester, PET, polymers and have the following properties: 918.05 1141 Property Test Method Unit Value, Min. Open Area COE, CW02215 % > Ultraviolet Stability ASTM D4355 70% at 500 hrs Ultimate Strength, machine dir ection ASTM D6637 lb/ft 1,500 Long-Term Design Strength, Allowable, LTDS, machine direction GRI-GG4 lb/ft 1,000* * Minimum Average Roll Value, MARV: Property value calculated as average minus two standard deviations.
LTDS =Tult (RFୈ)(RF୍ୖ)(RFୈ) where:
LTDS = Long Term Design Strength Tult = Ultimate strength RFCR = Reduction factor for creep RFIR = Reduction factor for installation damage RFD = Reduction factor for durability
The minimum reduction factors are as follows:
R F CR = 2.6 for HDPE, 4.0 for PP, 1.6 for PET 110 R F IR = 1.10 RF D = 1.10
918.06Fabric for Waterproofing
Fabric for waterproofing shall be treated cotton in accordance with ASTM D173, woven glass in accordance with ASTM D1668, or glass fiber mat in accordance with ASTM D2178. A Type C certification in acco rdance with 916 shall be provided for the fabric.