ASTM D8262-22
(Test Method)Standard Test Method for Determining the pH of Granular Material for Use in Embankments, Subgrades, and Retaining Wall Backfil
Standard Test Method for Determining the pH of Granular Material for Use in Embankments, Subgrades, and Retaining Wall Backfil
SIGNIFICANCE AND USE
5.1 Granular material being used in embankments, subgrades, and retaining wall backfill must often meet certain specifications relating to corrosion potential, such as pH and electrical resistivity. This standard is used by manufacturers, suppliers, and recipients of the materials to measure the pH of the material for acceptance for its intended use.
5.2 Retaining wall manufactures often use a granular material specification similar to: 100 % passing the 100 mm (4 in.) sieve, 75-100 % passing the 75 mm (3 in.) sieve, and 0-15 % passing the 75 μm (No. 200) sieve. The specification may vary depending on availability of local materials.
5.3 Since the total surface area of the material being tested affects the test results, the sample and specimen must have the same grading as the material specified or proposed for use. Reducing the particle size by crushing is not permitted since this process may alter the pH of the material and will likely not be representative of the material actually being placed in the field.
Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.
SCOPE
1.1 This test method uses a pH meter to measure the pH of as-received granular material that represents what will be used in the field for embankments, subgrades, and retaining wall backfill applications. The principal use of the test method is to supplement soil resistivity measurements to identify conditions under which the corrosion of metal embedded in granular material, or in contact with the granular material may be sharply accentuated.
1.2 The pH of granular material is often specified by agencies to meet criteria that are necessary to prevent or reduce corrosion of metal objects embedded in the granular material used in embankments, subgrade, and retaining wall backfill.
1.3 The types of granular material that can be tested for pH using this standard are natural or manufactured coarse sand, natural or crushed stone, natural or crushed gravel, air-cooled blast furnace slag, and aggregates: lightweight, heavyweight, or normal weight. According to AASHTO M 145, these granular materials generally fall into AASHTO classification groups A-1, A-2-4, A-2-5, or A-3. The ideal material is a well-graded, free draining material that has less than 10-15 % passing the 75 μm (No. 200) sieve.
1.4 This test is based on the volumetric method because the unit weight of the fill material will vary depending on source and project specifications.
1.5 Units—The values stated in SI units are to be regarded as standard. Except the sieve designations, they are identified using the “alternative” system in accordance with Specification E11, such as 3 in. and No. 200, instead of the “standard” of 75 mm and 75 µm, respectively. No other units of measurement are included in this standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard.
1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026, unless superseded by this test method.
1.6.1 The procedures used to specify how data are collected/recorded and calculated in the standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations fo...
General Information
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:D8262 −22
Standard Test Method for
Determining the pH of Granular Material for Use in
1
Embankments, Subgrades, and Retaining Wall Backfill
This standard is issued under the fixed designation D8262; 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 1.6.1 Theproceduresusedtospecifyhowdataarecollected/
recorded and calculated in the standard are regarded as the
1.1 This test method uses a pH meter to measure the pH of
industry standard. In addition, they are representative of the
as-received granular material that represents what will be used
significant digits that generally should be retained. The proce-
in the field for embankments, subgrades, and retaining wall
dures used do not consider material variation, purpose for
backfill applications. The principal use of the test method is to
obtaining the data, special purpose studies, or any consider-
supplement soil resistivity measurements to identify conditions
ations for the user’s objectives; and it is common practice to
under which the corrosion of metal embedded in granular
increase or reduce significant digits of reported data to be
material, or in contact with the granular material may be
commensuratewiththeseconsiderations.Itisbeyondthescope
sharply accentuated.
of these test methods to consider significant digits used in
1.2 The pH of granular material is often specified by
analysis methods for engineering data.
agenciestomeetcriteriathatarenecessarytopreventorreduce
1.7 This standard does not purport to address all of the
corrosion of metal objects embedded in the granular material
safety concerns, if any, associated with its use. It is the
used in embankments, subgrade, and retaining wall backfill.
responsibility of the user of this standard to establish appro-
1.3 The types of granular material that can be tested for pH
priate safety, health, and environmental practices and deter-
using this standard are natural or manufactured coarse sand,
mine the applicability of regulatory limitations prior to use.
natural or crushed stone, natural or crushed gravel, air-cooled
1.8 This international standard was developed in accor-
blast furnace slag, and aggregates: lightweight, heavyweight,
dance with internationally recognized principles on standard-
or normal weight. According to AASHTO M 145, these
ization established in the Decision on Principles for the
granular materials generally fall into AASHTO classification
Development of International Standards, Guides and Recom-
groups A-1, A-2-4, A-2-5, or A-3. The ideal material is a
mendations issued by the World Trade Organization Technical
well-graded, free draining material that has less than 10-15 %
Barriers to Trade (TBT) Committee.
passing the 75 µm (No. 200) sieve.
1.4 This test is based on the volumetric method because the 2. Referenced Documents
2
unit weight of the fill material will vary depending on source
2.1 ASTM Standards:
and project specifications.
C125 Terminology Relating to Concrete and Concrete Ag-
1.5 Units—The values stated in SI units are to be regarded
gregates
as standard. Except the sieve designations, they are identified C702/C702M Practice for Reducing Samples of Aggregate
usingthe“alternative”systeminaccordancewithSpecification to Testing Size
E11, such as 3 in. and No. 200, instead of the “standard” of 75 D75/D75M Practice for Sampling Aggregates
mm and 75 µm, respectively. No other units of measurement D653 Terminology Relating to Soil, Rock, and Contained
are included in this standard. Reporting of test results in units Fluids
other than SI shall not be regarded as nonconformance with D1193 Specification for Reagent Water
this standard. D3740 Practice for Minimum Requirements for Agencies
Engaged in Testing and/or Inspection of Soil and Rock as
1.6 All observed and calculated values shall conform to the
Used in Engineering Design and Construction
guidelines for significant digits and rounding established in
D4972 Test Methods for pH of Soils
Practice D6026, unless superseded by this test method.
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ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
2
RockandisthedirectresponsibilityofSubcommitteeD18.06onPhysical-Chemical For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Interactions of Soil and Rock. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved March 1, 2022. Published March 2022. DOI: 10.1520/ Standards volume information
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