ASTM C1260-07
(Test Method)Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method)
Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method)
SIGNIFICANCE AND USE
This test method provides a means of detecting the potential of an aggregate intended for use in concrete for undergoing alkali-silica reaction resulting in potentially deleterious internal expansion. It is based on the NBRI Accelerated Test Method (1-4).3 It is especially useful for aggregates that react slowly or produce expansion late in the reaction. However, it does not evaluate combinations of aggregates with cementitious materials nor are the test conditions representative of those encountered by concrete in service.
Because the specimens are exposed to a NaOH solution, the alkali content of the cement is not a significant factor in affecting expansions.
When excessive expansions (see Appendix X1) are observed, it is recommended that supplementary information be developed to confirm that the expansion is actually due to alkali-silica reaction. Sources of such supplementary information include: (1) petrographic examination of the aggregate (Guide C 295) to determine if known reactive constituents are present; (2) examination of the specimens after tests (Practice C 856) to identify the products of alkali reaction; and (3) where available, field service records can be used in the assessment of performance.
When it has been concluded from the results of tests performed using this test method and supplementary information that a given aggregate should be considered potentially deleteriously reactive, the use of mitigative measures such as low-alkali portland cement, mineral admixtures, or ground granulated blast-furnace slag should be evaluated (see last sentence of 4.1).
SCOPE
1.1 This test method permits detection, within 16 days, of the potential for deleterious alkali-silica reaction of aggregate in mortar bars.
1.2 The values stated in SI units are to be regarded as standard. The values in inch-pound units are shown in parentheses, and are for informational purposes only.
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 and health practices and determine the applicability of regulatory limitations prior to use. A specific precautionary statement is given in the section on Reagents.
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Standards Content (Sample)
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Designation: C1260 − 07
StandardTest Method for
Potential Alkali Reactivity of Aggregates (Mortar-Bar
1
Method)
This standard is issued under the fixed designation C1260; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* C490PracticeforUseofApparatusfortheDeterminationof
Length Change of Hardened Cement Paste, Mortar, and
1.1 This test method permits detection, within 16 days, of
Concrete
the potential for deleterious alkali-silica reaction of aggregate
C511Specification for Mixing Rooms, Moist Cabinets,
in mortar bars.
Moist Rooms, and Water Storage Tanks Used in the
1.2 The values stated in SI units are to be regarded as
Testing of Hydraulic Cements and Concretes
standard. The values in inch-pound units are shown in
C670Practice for Preparing Precision and Bias Statements
parentheses, and are for informational purposes only.
for Test Methods for Construction Materials
1.3 This standard does not purport to address all of the
C856Practice for Petrographic Examination of Hardened
safety concerns, if any, associated with its use. It is the Concrete
responsibility of the user of this standard to establish appro-
D1193Specification for Reagent Water
priate safety and health practices and determine the applica- E11Specification forWovenWireTest Sieve Cloth andTest
bility of regulatory limitations prior to use. Aspecific precau-
Sieves
tionary statement is given in the section on Reagents.
3. Terminology
2. Referenced Documents
3.1 Definitions:
2
2.1 ASTM Standards:
3.1.1 relative density (OD), n—as defined in Test Methods
C109/C109MTest Method for Compressive Strength of
C127 or C128, for coarse and fine aggregates, respectively.
Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube
3.2 For definitions of other terms relating to concrete or
Specimens)
aggregates, see Terminology C125.
C125Terminology Relating to Concrete and Concrete Ag-
gregates
4. Significance and Use
C127Test Method for Density, Relative Density (Specific
Gravity), and Absorption of Coarse Aggregate 4.1 This test method provides a means of detecting the
potential of an aggregate intended for use in concrete for
C128Test Method for Density, Relative Density (Specific
Gravity), and Absorption of Fine Aggregate undergoingalkali-silicareactionresultinginpotentiallydelete-
rious internal expansion. It is based on the NBRI Accelerated
C150Specification for Portland Cement
3
C151Test Method for Autoclave Expansion of Hydraulic Test Method (1-4). It is especially useful for aggregates that
react slowly or produce expansion late in the reaction.
Cement
C295GuideforPetrographicExaminationofAggregatesfor However,itdoesnotevaluatecombinationsofaggregateswith
cementitious materials nor are the test conditions representa-
Concrete
C305Practice for Mechanical Mixing of Hydraulic Cement tive of those encountered by concrete in service.
Pastes and Mortars of Plastic Consistency
4.2 BecausethespecimensareexposedtoaNaOHsolution,
the alkali content of the cement is not a significant factor in
affecting expansions.
1
This test method is under the jurisdiction of ASTM Committee C09 on
Concrete and ConcreteAggregatesand is the direct responsibility of Subcommittee
4.3 When excessive expansions (see Appendix X1) are
C09.26 on Chemical Reactions.
observed, it is recommended that supplementary information
CurrenteditionapprovedJune1,2007.PublishedJuly2007.Originallyapproved
be developed to confirm that the expansion is actually due to
in 1989. Last previous edition approved in 2005 as C1260–05a. DOI: 10.1520/
C1260-07.
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
3
Standards volume information, refer to the standard’s Document Summary page on The boldface numbers in parentheses refer to a list of references at the end of
the ASTM website. the text.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1260 − 07
alkali-silica reaction. Sources of such supplementary informa- 6.3 Sodium Hydroxide Solution—Eachlitreofsolutionshall
tion include: (1) petrographic examination of the aggregate contain 40.0 g of NaOH dissolved in 900 mL of water, and
(Guide C295) to determine if known reactive constituents are shall be diluted with additional distilled or deionized water to
present; (2) examination of the specimens after tests (Practice obtain 1.0 L of solution. The volume proportion of so
...
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