ASTM C1260-05a
(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)
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.
1.3This 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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Designation:C1260–05a
Standard Test 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* of Length Change of Hardened Cement Paste, Mortar, and
Concrete
1.1 Thistestmethodpermitsdetectionwithin16daysofthe
C511 Specification for Mixing Rooms, Moist Cabinets,
potential for deleterious alkali-silica reaction of aggregate in
Moist Rooms, and Water Storage Tanks Used in the
mortar bars.
Testing of Hydraulic Cements and Concretes
1.2 The values stated in SI units are to be regarded as
C670 Practice for Preparing Precision and Bias Statements
standard. The values in inch-pound units are shown in paren-
for Test Methods for Construction Materials
theses, and are for informational purposes only.
C856 Practice for Petrographic Examination of Hardened
1.3 This standard does not purport to address all of the
Concrete
safety concerns, if any, associated with its use. It is the
D1193 Specification for Reagent Water
responsibility of the user of this standard to establish appro-
E11 Specification for Wire Cloth and Sieves for Testing
priate safety and health practices and determine the applica-
Purposes
bility of regulatory limitations prior to use. Aspecific precau-
tionary statement is given in the section on Reagents.
3. Terminology
2. Referenced Documents 3.1 Definitions:
2
3.1.1 relative density (OD), n—as defined in Test Methods
2.1 ASTM Standards:
C127 or C128, for coarse and fine aggregates, respectively.
C109/C109M Test Method for Compressive Strength of
3.2 For definitions of other terms relating to concrete or
Hydraulic Cement Mortars(Using 2-in. or [50-mm] Cube
aggregates, see Terminology C125.
Specimens)
C125 Terminology Relating to Concrete and Concrete
4. Significance and Use
Aggregates
4.1 This test method provides a means of detecting the
C127 Test Method for Density, Relative Density (Specific
potential of an aggregate intended for use in concrete for
Gravity), and Absorption of Coarse Aggregate
undergoingalkali-silicareactionresultinginpotentiallydelete-
C128 Test Method for Density, Relative Density (Specific
rious internal expansion. It is based on the NBRI Accelerated
Gravity), and Absorption of Fine Aggregate
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Test Method (1-4). It is especially useful for aggregates that
C150 Specification for Portland Cement
react slowly or produce expansion late in the reaction. How-
C151 Test Method for Autoclave Expansion of Hydraulic
ever, it does not evaluate combinations of aggregates with
Cement
cementitious materials nor are the test conditions representa-
C295 Guide for Petrographic Examination of Aggregates
tive of those encountered by concrete in service.
for Concrete
4.2 BecausethespecimensareexposedtoaNaOHsolution,
C305 PracticeforMechanicalMixingofHydraulicCement
the alkali content of the cement is not a significant factor in
Pastes and Mortars of Plastic Consistency
affecting expansions.
C490 Practice for Use of Apparatus for the Determination
4.3 When excessive expansions (see Appendix X1) are
observed, it is recommended that supplementary information
1
be developed to confirm that the expansion is actually due to
This test method is under the jurisdiction of ASTM Committee C09 on
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee alkali-silica reaction. Sources of such supplementary informa-
C09.26 on Chemical Reactions.
tion include: (1) petrographic examination of the aggregate
Current edition approved Dec. 15, 2005. Published January 2006. Originally
approved in 1989. Last previous edition approved in 2005 as C1260–05.
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
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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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C1260–05a
(Guide C295) to determine if known reactive constituents are be4 60.5volumesofsolutionto1volumeofmortarbars.The
present; (2) examination of the specimens after tests (Practice volume of a mortar bar may be taken as 184 mL. Include
C856)toidentifytheproductsofalkalireaction;and(3)where sufficient test solution to ensure complete immersion of
...
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