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Home / DOT Specifications / Pennsylvania / Publication 408 — Specifications / 677
Incidental Construction (600-699)

677SELECTED MATERIAL SURFACING

PA · 2026 Standard SpecificationsBook pages 723–725View official source ↗

are indicated in Table B. Sample materials according to ASTM D4354 .

Table B Requirements for Class 1 Geogrids – Uniaxial Geogrid Reinforcement (All values are minimums unless indicated otherwise) Design Parameter Units Test Method Type A Type B Polymer Type - N/A Polymeric Coated PET Integrally Formed5 HDPE Ultimate Tensile Strength , (T U) lbs/ft ASTM D6637 (Method B) Design Specific Creep Reduction Factor, (RFCR)1 (determined for a 100 year design life) - AASHTO R 69 , ASTM D5262, and ASTM D6992 1.60 2.60 Installation Damage Reduction Factor, ( RFID)1,2 - AASHTO R 69 1.30 1.30 Durability Reduction Factor, (RFD)1 - N/A 1.20 1.10 Combined Reduction Factor (RF OV)1,3 - AASHTO R 69 2.50 3.70 Machine Direction (MD) Aperture Size in. N/A 0.60 to 6.0 (Min. to Max.) 0.60 Cross Machine Direction (XD) Aperture Size in. N/A 0.50 0.50 Rib Section Area Ratio4 - N/A 0.30 0.30 Percent Open Area % N/A 45 45 Notes:

1.Value indicated is the minimum reduction factor to be used in determining the Allowable Geosynthetic

Tensile Strength. If product specific data values are lower, the value indicated in Table B must be used. If product specific data values are higher, the product specific data values must be used.

2.Installation Damage Reduction Factor (RF ID) is valid for a maximum aggregate particle size of

1.5 inch as specified in Section 738.2(b)3.

3.RFOV = RF CR x RF ID x RF D
4.Rib Section Area Ratio = Minimum XD Rib Section Area / Minimum MD Rib Section Area
5.Manufactured by a punched -drawn process.
1.Ultimate Tensile Strength, (T U). The calculated T U is a minimum average roll value (MARV). The

MARV is determined by subtracting two standard deviations from the average ultimate tensile strength obtained from the last twelve months of manufacturer quality control testing. Conduct testing for T U according to ASTM D6637, Method B.

2.Creep Reduction Factor, (RFCR). Determine the geogrid creep reduction factor (RFCR) according

to AASHTO R 69 , ASTM D5262 , and ASTM D6992 . Test samples unconfined in the direction in which the load will be applied. Use the ratio of ultimate strength to creep limiting strength to c alculate the creep reduction factor . If the calculated creep reduction factor is greater than the creep reduction factor indicated in Table B , use the calculated creep reduction factor .

3.Installation Damage Reduction Factor, (RF ID). Use the minimum installation damage reduction

factor (RF ID) indicated in Table B for material with a maximum particle size of 1.5 inches (excluding random oversized particle sizes) unless project specific conditions or a specific geogrid indicates a higher value that was determined according to AASHTO R 69. For materials having greater than

Source: Pennsylvania Department of Transportation Specifications, 2026 Edition. Pages 723–725 of 1,522.
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