ASTM D8105-18
(Guide)Standard Guide for Use and Application of Geosynthetic Reinforcement Reduction Factor Test Results
Standard Guide for Use and Application of Geosynthetic Reinforcement Reduction Factor Test Results
SIGNIFICANCE AND USE
4.1 The long-term material strength of geosynthetic reinforcement material is a critical design parameter for many civil engineering projects including, but not limited to, reinforced wall structures and reinforced slopes. Geosynthetic reinforcement products are produced using a variety of polymeric materials and using a variety of manufacturing procedures. Accordingly, product-specific testing using representative produced products is recommended for establishment of long-term material strength for products used as reinforcement in structures.
4.2 The primary use of the test results obtained from a reinforcement testing program is to determine the available long-term (that is, end of design life, typically 75 years) material strength, Tal, of the reinforcement. The available long-term strength, Tal, is calculated as follows:
4.3 This long-term geosynthetic reinforcement strength concept is illustrated in Fig. 1. As shown in the figure, some strength losses occur immediately upon installation, and others occur throughout the design life of the reinforcement. Much of the long-term strength loss does not begin to occur until near the end of the reinforcement design life.
FIG. 1 Long-Term Geosynthetic Strength Concepts
4.4 The value selected for Tult, for design purposes, is the minimum average roll value (MARV) for the product. This minimum average roll value, denoted as TMARV, accounts for statistical variance in the material strength. Other sources of uncertainty and variability in the long-term strength result from installation damage, creep extrapolation, and the chemical degradation process. It is assumed that the observed variability in the creep rupture envelope is 100 % correlated with the short-term tensile strength, as the creep strength is typically directly proportional to the short-term tensile strength within a product line. Therefore, the MARV of Tult adequately takes into account variability in the creep strength.
4.5 In accordanc...
SCOPE
1.1 This guide presents a description of how to use test results from reduction factor test reports for reinforcement geosynthetics. It is based solely on testing and reporting requirements as established in American Association of State Highway and Transportation Officials (AASHTO) standard AASHTO R 69-15, Standard Practice for Determination of Long-Term Strength for Geosynthetic Reinforcement. AASHTO R 69-15 is used to determine the long-term allowable material strength, Tal, that is solely product property performance dependant.
1.2 This guide is intended to assist designers and users of reinforcement geosynthetics when reviewing reports of reduction factor testing efforts. This guide is not intended to replace education or experience, or other alternative design procedures. This guide is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a project’s many unique aspects. Not all aspects of this guide may be applicable in all circumstances. The word “standard” in the title of this document means only that the document has been approved through the ASTM consensus process.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized pr...
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D8105 − 18
Standard Guide for
Use and Application of Geosynthetic Reinforcement
1
Reduction Factor Test Results
This standard is issued under the fixed designation D8105; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This guide presents a description of how to use test
mendations issued by the World Trade Organization Technical
results from reduction factor test reports for reinforcement
Barriers to Trade (TBT) Committee.
geosynthetics. It is based solely on testing and reporting
requirements as established in American Association of State
2. Referenced Documents
Highway and Transportation Officials (AASHTO) standard
AASHTO R 69-15, Standard Practice for Determination of 2
2.1 ASTM Standards:
Long-Term Strength for Geosynthetic Reinforcement.
D4355/D4355M Test Method for Deterioration of Geotex-
AASHTO R 69-15 is used to determine the long-term allow-
tiles by Exposure to Light, Moisture and Heat in a Xenon
able material strength, T , that is solely product property
al
Arc-Type Apparatus
performance dependant.
D4595 Test Method for Tensile Properties of Geotextiles by
1.2 This guide is intended to assist designers and users of
the Wide-Width Strip Method
reinforcement geosynthetics when reviewing reports of reduc-
D4603 Test Method for Determining Inherent Viscosity of
tion factor testing efforts. This guide is not intended to replace
Poly(Ethylene Terephthalate) (PET) by Glass Capillary
educationorexperience,orotheralternativedesignprocedures.
Viscometer
This guide is not intended to represent or replace the standard
D5262 Test Method for Evaluating the Unconfined Tension
of care by which the adequacy of a given professional service
Creep and Creep Rupture Behavior of Geosynthetics
must be judged, nor should this document be applied without
D5721 Practice forAir-OvenAging of Polyolefin Geomem-
consideration of a project’s many unique aspects. Not all
branes
aspects of this guide may be applicable in all circumstances.
D5818 Practice for Exposure and Retrieval of Samples to
The word “standard” in the title of this document means only
Evaluate Installation Damage of Geosynthetics
that the document has been approved through the ASTM
D6637/D6637M Test Method for Determining Tensile Prop-
consensus process.
erties of Geogrids by the Single or Multi-Rib Tensile
1.3 The values stated in either SI units or inch-pound units
Method
are to be regarded separately as standard. The values stated in
D6992 Test Method for Accelerated Tensile Creep and
each system may not be exact equivalents; therefore, each
Creep-Rupture of Geosynthetic Materials Based on Time-
system shall be used independently of the other. Combining
Temperature Superposition Using the Stepped Isothermal
values from the two systems may result in nonconformance
Method
with the standard.
D7409 Test Method for Carboxyl End Group Content of
1.4 This standard does not purport to address all of the
Polyethylene Terephthalate (PET) Yarns
safety concerns, if any, associated with its use. It is the
3
2.2 AASHTO Standard:
responsibility of the user of this standard to establish appro-
AASHTO R 69-15 Standard Practice for Determination of
priate safety, health, and environmental practices and deter-
Long-Term Strength for Geosynthetic Reinforcement
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
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This guide is under the jurisdiction ofASTM Committee D35 on Geosynthetics the ASTM website.
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and is the direct responsibility of Subcommittee D35.01 on Mechanical Properties. Available from American Association of State Highway and Transportation
Current edition approved July 1, 2018. Published August 2018. Originally Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
approved in 2018. DOI: 10.1520/D8105-18. http://www.transportation.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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