Erosion Control Geogrid.pdf
PDF 25 KB Posted
- Attached to
- Erosion Control Products
- Solicitation number
- RFB 605 2100000736 1
- Issued by
- Kentucky
About this file
This is a product specification document issued by Tensar Earth Technologies, Inc. for the Structural Geogrid BX1200, an erosion control and soil reinforcement material. The specification, dated December 22, 2004, details the technical requirements and performance characteristics for an integrally formed structural geogrid manufactured from stress-resistant polypropylene. The geogrid is designed for reinforcement of compacted soil and particulate construction fill materials in structural load-bearing applications such as earth retention systems. The product is delivered in roll form with standard dimensions of 3.0 meters (9.8 feet) or 4.0 meters (13.1 feet) in width and 50.0 meters (164 feet) in length, with typical truckload quantities ranging from 165 to 220 rolls. Custom cutting to specific lengths or widths is available upon special request to accommodate site-specific engineering designs.
The specification establishes minimum performance standards across multiple categories including load capacity, structural integrity, and durability. Key performance metrics include a true initial modulus ranging from 400 to 650 kN/m depending on direction, junction efficiency of 93 percent, flexural stiffness of 750,000 mg-cm, and aperture stability of 6.5 kg-cm/deg. The geogrid demonstrates high resistance to installation damage with retention rates of 95 percent in clayey sand, 93 percent in well-graded sand, and 90 percent in poorly-graded gravel. The product maintains 100 percent resistance to long-term degradation in chemically aggressive environments as measured by EPA 9090 immersion testing. All specifications conform to referenced ASTM standards and GRI guidelines for testing and measurement protocols.
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Text version
Tensar Earth Technologies, Inc.
5883 Glenridge Drive, Suite 200 Atlanta, Georgia 30328-5363
(800) 836-7271
December 22, 2004 This product specification supersedes all prior specifications for the product described above and is not applicable to any products shipped prior to December 22, 2004.
Product Specification - Structural Geogrid BX1200
The structural geogrid shall be an integrally formed grid structure manufactured of a stress resistant polypropylene material with molecular weight and molecular characteristics which impart: (a) high resistance to loss of load capacity or structural integrity when the geogrid is subjected to mechanical stress in installation; (b) high resistance to deformation when the geogrid is subjected to applied force in use; and
(c) high resistance to loss of load capacity or structural integrity when the geogrid is subjected to long-term environmental stress.
The structural geogrid shall accept applied force in use by positive mechanical interlock (i.e. by direct mechanical keying) with: (a) compacted soil or construction fill materials; (b) contiguous sections of itself when overlapped and embedded in compacted soil or construction fill materials; and (c) rigid mechanical connectors such as bodkins, pins or hooks. The structural geogrid shall possess sufficient cross sectional profile to present a substantial abutment interface to compacted soil or particulate construction fill materials and to resist movement relative to such materials when subject to applied force. The structural geogrid shall possess sufficient true initial modulus to cause applied force to be transferred to the geogrid at low strain levels without material deformation of the reinforced structure.
The structural geogrid shall possess complete continuity of all properties throughout its structure and shall be suitable for reinforcement of compacted soil or particulate construction fill materials to improve their long term stability in structural load bearing applications such as earth retention systems. The structural geogrid shall otherwise have the following characteristics:
Product Type: Integrally Formed Structural Geogrid Load Transfer Mechanism: Positive Mechanical Interlock
Product Properties Index Properties Units MD Values1 XMD Values1
Aperture Dimensions2 mm (in) 25 (1.0) 33 (1.3) Minimum Rib Thickness2 mm (in) 1.27 (0.05) 1.27 (0.05)
Load Capacity True Initial Modulus in Use3 kN/m(lb/ft) 400 (27,420) 650 (44,550) True Tensile Strength @2% Strain3 kN/m(lb/ft) 6.0 (410) 9.0 (620) True Tensile Strength @5% Strain3 kN/m(lb/ft) 11.8 (810) 19.6 (1,340)
Structural Integrity Junction Efficiency4 % 93 Flexural Stiffness5 mg-cm 750,000 Aperture Stability6 kg-cm/deg 6.5
Durability Resistance to Installation Damage7 %SC / %SW / %GP 95 / 93 / 90 Resistance to Long Term Degradation8 % 100
Dimensions and Delivery The structural geogrid shall be delivered to the jobsite in roll form with each roll individually identified and nominally measuring 3.0 meters (9.8 feet) or
4.0 meters (13.1 feet) in width and 50.0 meters (164 feet) in length. A typical truckload quantity is 165 to 220 rolls. On special request, the structural geogrid may also be custom cut to specific lengths or widths to suit site specific engineering designs.
Notes
1. Unless indicated otherwise, values shown are minimum average roll values determined in accordance with ASTM D-4759. Brief descriptions of test procedures are given in the following notes. Complete descriptions of test procedures are available on request from Tensar Earth Technologies, Inc.
2. Nominal Dimensions.
3. True resistance to elongation when initially subjected to a load measured via ASTM D6637 without deforming test materials under load before measuring such resistance or employing "secant" or "offset" tangent methods of measurement so as to overstate tensile properties.
4. Load transfer capability measured via GRI-GG2-87. Expressed as a percentage of ultimate tensile strength.
5. Resistance to bending force measured via ASTM D-5732-95, using specimens of width two ribs wide, with transverse ribs cut flush with exterior edges of longitudinal ribs (as a “ladder”), and of length sufficiently long to enable measurement of the overhang dimension. The overall Flexural Stiffness is calculated as the square root of the product of machine-and cross-machine-direction Flexural Stiffness values.
6. Resistance to in-plane rotational movement measured by applying a 20 kg-cm moment to the central junction of a 9 inch x 9 inch specimen restrained at its perimeter (U.S. Army Corps of Engineers Methodology for measurement of Torsional Rigidity).
7. Resistance to loss of load capacity or structural integrity when subjected to mechanical installation stress in clayey sand (SC), well graded sand (SW), and crushed stone classified as poorly graded gravel (GP). The geogrid shall be sampled in accordance with ASTM D5818 and load capacity shall be measured in accordance with ASTM D6637.
8. Resistance to loss of load capacity or structural integrity when subjected to chemically aggressive environments measured via EPA 9090 immersion testing.
Tensar Earth Technologies, Inc. reserves the right to change its product specifications at any time. It is the responsibility of the specifier and purchaser to ensure that product specifications used for design and procurement purposes are current and consistent with the products used in each instance.
Please contact Tensar Earth Technologies, Inc. at 800-836-7271 for assistance
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