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SECTION 31 05 19.19
SECTION 31 05 19.19
GEOGRIDS/GEOCOMPOSITES
| PART 1 | GENERAL |
| 1.1 | SECTION INCLUDES |
| A. | Geogrid and geocomposite material requirements. |
| 1.2 | REFERENCES |
| A. | ASTM D 4354: Standard Practice for Sampling of Geotextiles for Testing. |
| B. | ASTM D 4759: Standard Practice for Determining Specification Conformance of Geosynthetics. |
| C. | ASTM D 4873: Standard Guide for Identification, Storage, and Handling of Geotextiles. |
| D. | ASTM D 5321: Standard Practice for Determining the Coefficient of Soil and Geosynthetic by Direct Shear. |
| E. | ASTM D 6213: Standard Tests to Evaluate the Chemical Resistance of Geogrids to Liquids. |
| F. | ASTM D 6637: Standard Test Method for Determining Tensile Properties of Geogrid. |
| G. | FHWA-SA-96-071: Mechanically Stabilized Earth Walls and Reinforced Soil Slopes Design and Construction Guidelines. |
| 1.3 | DEFINITIONS |
| A. | Geocomposite: Fabric composed of a geogrid and geotextile. |
| B. | MARV: Defined in Section 31 05 19. |
| 1.4 | SUBMITTALS |
| A. | Geogrid sample. |
| B. | Geocomposite sample |
| C. | Manufacturer’s warranty. |
| D. | Installer’s warranty. |
| 1.5 | DELIVERY STORAGE AND HANDLING |
| A. | Label, handle and store product, ASTM D 4873. |
| B. | Deliver product dry, in a plastic wrapping that protects the entire roll. |
| C. | Protect product from ultraviolet light and temperature greater than 160 deg. F. until application. Cover product within 14 days of deployment. |
| 1.6 | QUALITY ASSURANCE |
| A. | Provide manufacturer’s on-site technical supervision and assistance if required for manufacturer’s warranty. |
| 1.7 | WARRANTY |
| A. | Manufacturer: Warrant product for a period of 20 years on a prorated basis against manufacturing defects, workmanship, and deterioration due to exposure to the elements. |
| B. | Installer: Warrant material and workmanship for 2 years. |
| PART 2 | PRODUCTS |
| 2.1 | GEOGRID/GEOCOMPOSITES - GENERAL |
| A. | Synthetic fiber net at least 85 percent by weight of polypropylene, polyethylene, polyester, polyvinyl alcohol, or polyamide. |
| B. | Resistant to chemical attack, rot and mildew. |
| C. | No tears or defects that will adversely alter properties of product. |
| 2.2 | ROADWAY PAVEMENT GEOCOMPOSITE |
| A. | Placement is between asphalt layers. Product is geogrid glued to a lightweight non-woven bitumen coated geotextile. |
Table 1: Roadway Pavement Geocomposite
| Ultimate Tensile Strength, lb/ft |
| D 6637 |
| 3425 x 3425 |
| Tensile Strength at 3 percent Strain, lb/ft |
| D 6637 |
| 825 x 825 |
| Melting Point (geogrid), deg. F. |
| – |
| 490 |
| Softening Point (geotextile), deg. F. |
| – |
| 220 |
| 2.3 | ROADWAY AGGREGATE GEOGRID |
| A. | Subbase geogrid is placed on the Subgrade below new fill or crushed aggregate base. |
| B. | Base course geogrid is placed between fills or crushed aggregate bases. |
Table 2: Roadway Aggregate Geogrid
| Ultimate Tensile Strength, lbs/ft. |
| D 6637 |
| 900 x 1400 |
| 900 x 1400 |
| Tensile Strength at 2 percent Strain, lbs/ft. |
| D 6637 |
| – |
| 300 x 445 |
| Tensile Strength at 5 percent Strain, lbs/ft. |
| D 6637 |
| 580 x 920 |
| – |
| Coefficient of Direct Shear |
| D 5321 |
| 1.0 |
| 1.0 |
| Chemical Resistance range, pH |
| D 6213 |
| 2 – 12 |
| 2 – 12 |
| Aperture Size range, inches |
| Measured |
| 0.5 – 1.3 |
| 0.5 – 1.3 |
| Open Area, percent |
| - |
| 50 – 80 |
| 50 – 80 |
| 2.4 | EMBANKMENT GEOGRID |
| A. | Geogrid is used for earth slope and retaining wall reinforcement. |
Table 3: Embankment Geogrid
| Long Term Design Strength, lb/ft |
| (a) |
| 700 |
| 1300 |
| 1900 |
| Chemical resistance, pH |
| D 6213 |
| 2 – 12 |
| 2 – 12 |
| 2 – 12 |
| Aperture Size inches |
| Measured |
| 0.8 – 1.2 |
| 0.8 – 1.2 |
| 0.8 – 1.2 |
NOTES
(a) FHWA-SA-96-071.
| 2.5 | CLAMPS, TAPE, RUBBER PADS |
| A. | Recommended by manufacturer. |
| 2.6 | SOURCE QUALITY CONTROL |
| A. | Sample geogrids and geocomposites using ASTM D 4354 standard practices. |
| B. | Verify specification conformance, ASTM D 4759. |
| PART 3 | EXECUTION |
| 3.1 | PREPARATION |
| A. | Instruct workers about protecting product of this section. |
| B. | Repair damage to Subgrade surface prior to installation. |
| C. | Round edges of Excavation and grade changes. |
| 3.2 | GRANULAR BASE REINFORCEMENT |
| A. | Deploy each panel per manufacturer’s recommendations. |
| B. | Provide sufficient material to allow for expansion and contraction. |
| C. | Do not fold. Do not tie overlaps. |
| D. | Install panels so overlapping panel is upgrade of the underlying panel. |
| E. | Provide geogrid overlap as follows. |
| Soil CBR Rating |
| Minimum Overlap |
| F. | Provide a minimum fill thickness of six inches prior to operating tracked vehicles over geogrid. |
| 3.3 | ASPHALT CONCRETE PAVEMENT REINFORCEMENT |
| A. | Clean the surface of the asphalt concrete base course. |
| B. | Seal cracks wider than 1/8 of an inch. Repair larger cracks, Potholes, depressions, and irregularities. |
| C. | Spray on tack coat uniformly at 0.08 - 0.10 gal/yd2 and place geogrid on the tack coat. |
| D. | Overlap in a shingle fashion in the direction of overlay placement. Overlap all roll edges and ends six inches. |
| E. | Place 2 inches minimum asphalt concrete over the geogrid. Compact, Section 32 12 16. |
| 3.4 | SOIL REINFORCEMENT |
| A. | Compact Embankment Subgrade. |
| B. | Place Embankment geogrid at the locations and elevations shown on the Plans or controlled by the geogrid manufacturer. Place any specified free draining crushed aggregate base above the geogrid. Compact the fill to a Standard Proctor of 95 percent or greater. |
| 3.5 | PROTECTION |
| A. | At least 6 inches of fill cover is required if tracked vehicles are operated over geogrid. |
END OF SECTION
GEOGRIDS/GEOCOMPOSITES Page 1
