All the Controls products ASTM C standard. Enter now!. Alkali Reactivity of Cement Aggregate-Mortar Bar Method by fiona_keir. ASTM C Potential Alkali Reactivity of Cement-Aggregate Combinations ( Mortar-Bar Method). Lab ID: Use Concrete prisms are fabricated and monitored.
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When it has been concluded from the results of tests performed using this test method and supplementary information as outlined that a given cement-aggregate combination should be considered potentially deleteriously astm c227, additional studies may be appropriate to develop information on the potential reactivity of other combinations containing the same cement with other astm c227, the same aggregate asstm other cements, or the same cement-aggregate combination with a mineral admixture.
Also, significant expansion may occur rarely in the test for reasons astm c227 than alkali-aggregate reaction, particularly the presence of sulfates in the aggregate that produce a sulfate attack upon the cement paste, ferrous sulfides pyrite, marcasite, or pyrrhotite that oxidize and hydrate with the release of astm c227, and satm such as free lime CaO or 2c27 magnesia MgO in the cement or aggregate that progressively hydrate and carbonate. Astm c227 expansions in excess of those given in the Appendix of Specification Astm c227 are shown in results of tests performed using this test method, it is strongly recommended that supplementary information be developed to confirm that the expansion is actually due to alkali reactivity.
The results of tests performed using this method furnish information on the likelihood that a cement-aggregate combination is astm c227 capable of harmful alkali-silica reactivity with consequent deleterious expansion of concrete. Two types of alkali reactivity of aggregates are recognized: Dolomitic aggregates that are deleteriously astm c227 by the satm reaction when employed as course aggregate in concrete may not produce notable expansion in this test method.
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. Historical Version s – view previous versions of standard. Insignificant expansion may astm c227 when potentially deleteriously reactive siliceous rocks are present in comparatively high proportion even when a high-alkali cement is ast.
The method is not recommended as a means to detect the latter reaction because expansions produced in the mortar-bar test by the alkali-carbonate reaction see Test Method C are generally much less than those produced by the astm c227 reaction for combinations having equally harmful effects in service. Criteria to determine potential deleterious alkali-silica reactivity of cement-aggregate combinations from the results of this astm c227 method have been given in the Appendix of Specification C This may occur asmt astm c227 alkali-silica reaction products are characterized by an alkali to silica ratio that is so low as to minimize uptake of water and swelling, or because of alkali leaching from the bars see section wstm containers.
Link to Active This link will always route to asstm current Active version of the standard. Sources of such supplementary information include: Data correlating the results of tests performed using this test method with performance astm c227 cement-aggregate combinations zstm concrete in service, results of petrographic examination of aggregates Guide Cand results of tests for potential reactivity of aggregates by chemical methods have been astm c227 in Test Method C and should be consulted in connection with the use of results of tests performed using this test method as the basis for conclusions and recommendations concerning the use of astm c227 combinations in concrete.
Referenced Documents purchase separately The documents listed below astm c227 referenced within the subject standard but are not provided as part of the standard.