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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Insignificant expansion may result when potentially deleteriously reactive siliceous rocks are present in comparatively high proportion astm c227 when a high-alkali cement is used.
Sources of such supplementary information include: Awtm to Active This link will always route to the current Active version of the standard. When expansions in excess of those given astm c227 the Appendix of Specification C33 are shown in results of astm c227 performed using this test method, it is strongly recommended that supplementary information be developed to confirm astm c227 the expansion is actually due to alkali reactivity.
ASTM C Standard
astm c227 Two types of alkali reactivity of aggregates are recognized: Also, significant expansion astm c227 occur zstm in the test for reasons other 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, astm c227 pyrrhotite that oxidize and d227 with the release of sulfate, and materials such as free lime CaO or free magnesia MgO in the cement or aggregate that astm c227 hydrate and carbonate.
The results of tests performed using this method furnish information on the likelihood that a cement-aggregate combination is potentially capable of harmful alkali-silica reactivity with consequent deleterious expansion of concrete.
When it has been concluded from the results of tests performed x227 this test method and supplementary information qstm outlined that a given cement-aggregate combination should be considered potentially deleteriously reactive, astm c227 studies may be appropriate to develop information on the potential reactivity of other combinations astm c227 the same cement with other aggregates, the same aggregate with other cements, or the same cement-aggregate combination with astm c227 mineral admixture.
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.
Criteria to determine potential deleterious alkali-silica reactivity of cement-aggregate combinations from the results of this test method have been given in the Appendix of Specification C The method is not astm c227 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.
Data correlating the results of tests performed using this test method with performance of cement-aggregate combinations in concrete in service, results of petrographic examination of aggregates Guide Cand results of tests for potential reactivity of aggregates by chemical methods have been published in Test Method Astm c227 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 cement-aggregate combinations in concrete.
Dolomitic aggregates that are deleteriously affected by the alkali-carbonate reaction when employed as course aggregate in concrete may not produce astm c227 expansion in this test method.
Referenced Documents purchase separately Astm c227 documents listed below are referenced within the subject standard but are not provided as part of the standard. Astm c227 may occur because the 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 on containers.
Historical Version s – view previous versions of standard.