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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Astm c227 Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part qstm the standard. This may occur because the alkali-silica reaction products are characterized by an alkali to silica ratio that is so low as astm c227 minimize uptake of water and swelling, or because of alkali leaching from the bars see section on containers.
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 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 C and should be consulted in connection with the use of results of tests performed using this astm c227 method as the basis astm c227 conclusions and recommendations concerning the use of cement-aggregate combinations in astm c227.
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. Also, significant expansion may occur rarely 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, astm c227 sulfides pyrite, marcasite, or pyrrhotite that oxidize and hydrate with the release of sulfate, and materials such as free lime CaO or astm c227 magnesia MgO in the cement or astm c227 that progressively hydrate and carbonate.
Sources of such supplementary information include: Link to Active This link will always route to the current Active version of the standard. When it has been concluded from the results of tests performed using this test method and supplementary information as astm c227 that a given cement-aggregate combination should astm c227 considered potentially deleteriously reactive, additional studies may be appropriate to develop information on the potential reactivity of other combinations containing the same cement with other aggregates, the same aggregate with other cements, or the same cement-aggregate combination with astm c227 mineral admixture.
Historical Version s – view previous versions of astm c227. Dolomitic aggregates that are deleteriously affected by the alkali-carbonate reaction when employed as course asstm in concrete may not produce notable expansion in this test method.
The results of tests performed astm c227 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. Insignificant expansion may result when potentially deleteriously reactive siliceous rocks are present in comparatively high proportion even when a high-alkali cement is astm c227.
Two types of alkali reactivity of aggregates are recognized: The method aztm 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 alkali-silica reaction for combinations having equally harmful effects in astm c227.
When expansions astm c227 excess astm c227 those given in the Appendix of Specification C33 c27 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.