ASTM D8462-22

Standard Test Method for Cyclic Plate Load Tests to Evaluate the Structural Performance of Roadway Test Sections with Geosynthetics

SIGNIFICANCE AND USE
5.1 The CPL test is intended as a performance test to quantify the benefits of geosynthetics in pavement structures, as recommended by AASHTO R 50-09. Performance is predominantly defined in terms of S-TBR.  
5.2 The CPL test is a laboratory test used to accelerate rutting in a roadway cross section using a stationary cyclic plate. While the application of load differs from actual roads, the results from similarly constructed CPL tests are useful to evaluate and compare the performance of various products or designs. The results from these tests are most relevant to roads having similar design characteristics (material strengths and thicknesses).
Note 1: The extrapolation of cyclic plate results to designs that deviate significantly from the parameters tested may not be accurate, and performance calculations made at significantly different load cycle levels than the expected service life of an actual pavement may not provide an accurate estimate of the benefits actually realized.  
5.3 The number of load cycles applied by the CPL device corresponds to the number of equivalent single-axle loads (ESALs) used in the AASHTO 1993 pavement design equation.  
5.4 The test method is applicable to geosynthetics and soils used in typical pavement applications.  
5.5 This test method produces test data that can be used to compare geosynthetic products, construction methods, and cross section configurations used in design of roads.  
5.6 This test can be used to characterize specific behaviors of the geosynthetic under the conditions tested by including sensors to measure stresses and strains within the pavement cross section or on the geosynthetic itself. Sensors should be appropriately sized and installed to minimize their influence on the results of the test.  
5.7 The relationship between load cycles and deformation is a function of the composite stiffness of the constructed system and the interdependence between the individual components of the design.
SCOPE
1.1 This standard test method outlines the procedure used to determine the performance of unpaved and paved roadway cross sections, with and without geosynthetics, that are built in a controlled manner and tested using a stationary, cyclic load applied to the surface to simulate traffic.  
1.2 Test section performance from these tests is normally calculated as a function of life extension, but can also be determined based on structural improvement. Life extension is related to the number of load cycles that can be accommodated by a particular configuration when compared to a similarly constructed control. Structural improvements are based on elemental or system-wide stiffness increases.  
1.3 The cyclic plate load (CPL) test is intended to be a performance test conducted as closely as possible to as-built unpaved and paved roadway cross sections. It has been used as a tool to compare different geosynthetics; soil types, strengths, and thicknesses; and construction procedures for a variety of pavement applications.  
1.4 Units—The values stated in SI units are to be regarded as standard. Values in parentheses are for information only.  
1.5 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.  
1.6 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.

General Information

• Status: Published
• Publication Date: 30-Jun-2022
• ICS: 59.080.70 - Geotextiles
• ICS: 93.080.20 - Road construction materials
• Technical Committee: D35 - Geosynthetics
• Drafting Committee: D35.01 - Mechanical Properties

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: D8462 − 22
Standard Test Method for
Cyclic Plate Load Tests to Evaluate the Structural
1
Performance of Roadway Test Sections with Geosynthetics
This standard is issued under the fixed designation D8462; 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 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This standard test method outlines the procedure used to
determine the performance of unpaved and paved roadway D4439 Terminology for Geosynthetics
3
2.2 AASHTO Standards:
cross sections, with and without geosynthetics, that are built in
a controlled manner and tested using a stationary, cyclic load AASHTO R 50-09 Standard Practice for Geosynthetic Re-
inforcement of the Aggregate Base Course of Flexible
applied to the surface to simulate traffic.
Pavement Structures
1.2 Test section performance from these tests is normally
calculated as a function of life extension, but can also be
3. Terminology
determined based on structural improvement. Life extension is
3.1 Definitions—For definitions of common geosynthetic
related to the number of load cycles that can be accommodated
terms used in this test method, refer to Terminology D4439.
by a particular configuration when compared to a similarly
constructed control. Structural improvements are based on 3.2 Definitions of Terms Specific to This Standard:
elemental or system-wide stiffness increases. 3.2.1 equivalent single-axle load (ESAL), n—the total num-
ber of repetitions of a standard design load of 80 kN (18 kips)
1.3 The cyclic plate load (CPL) test is intended to be a
applied to a single axle having two sets of dual wheels.
performance test conducted as closely as possible to as-built
3.2.2 stationary traffıc benefit ratio (S-TBR), n—the ratio of
unpaved and paved roadway cross sections. It has been used as
the number of load cycles of a pavement structure with
a tool to compare different geosynthetics; soil types, strengths,
geosynthetics to the number of load cycles for the same test
and thicknesses; and construction procedures for a variety of
section without geosynthetics to reach the same defined failure
pavement applications.
state, where the cyclic load is applied using a stationary plate.
1.4 Units—The values stated in SI units are to be regarded
3.2.3 traffıc benefit ratio (TBR), n—the ratio of the number
as standard. Values in parentheses are for information only.
ofloadcyclesofapavementstructurewithgeosyntheticstothe
1.5 This standard does not purport to address all of the
number of load cycles for the same test section without
safety concerns, if any, associated with its use. It is the
geosynthetics to reach the same defined failure state.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4. Summary of Test Method
mine the applicability of regulatory limitations prior to use.
4.1 This test method covers the major considerations asso-
1.6 This international standard was developed in accor-
ciated with cyclic plate load tests conducted on laboratory-
dance with internationally recognized principles on standard-
constructed pavement test sections that are built inside a large,
ization established in the Decision on Principles for the
rigid test vessel and cyclically loaded to simulate traffic.
Development of International Standards, Guides and Recom-
Common configurations include paved and unpaved roads and
mendations issued by the World Trade Organization Technical
other load support applications that include geosynthetics.
Barriers to Trade (TBT) Committee.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
1
This test method is under the jurisdiction of ASTM Committee D35 on Standards volume information, refer to the standard’s Document Summary page on
Geosynthetics and is the direct responsibility of Subcommittee D35.01 on Mechani- the ASTM website.
3
cal Properties. Available from American Association of State Highway and Transportation
Current edition approved July 1, 2022. Published July 2022. DOI: 10.1520/ Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
D8462-22. http://www.transportation.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D84
...