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ASTM C227 PDF DOWNLOAD

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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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part astm c227 the standard.

The method is not recommended as a means to detect the latter astm c227 because expansions produced in the mortar-bar test by the alkali-carbonate reaction see Test Method Astm c227 are generally much less than those produced by the alkali-silica reaction for combinations having equally harmful effects in service.

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This 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 astm c227 swelling, or because of alkali leaching from the bars see section on containers.

Dolomitic aggregates that are deleteriously affected by the alkali-carbonate reaction when employed as adtm aggregate in concrete may not produce notable expansion astm c227 this test method.

Historical Version s – view previous versions of standard. When it has been concluded from the results of tests c27 using this test method and supplementary information as outlined that a given cement-aggregate combination should be considered potentially deleteriously reactive, additional studies may be appropriate to develop information on astm c227 potential reactivity of other combinations containing the same cement with other aggregates, the same aggregate with other cements, astm c227 the same cement-aggregate combination with a mineral admixture.

Data correlating the results of tests astm c227 using this test method with astm c227 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 asgm methods have been published in Test Method C and should be consulted atsm 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 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.

ast, Two types of alkali reactivity astm c227 aggregates are recognized: The results of tests performed using astm c227 method astm c227 information on the likelihood that a cement-aggregate combination is potentially capable of harmful alkali-silica reactivity astm c227 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 used. Sources of such supplementary information include: 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 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, ferrous sulfides pyrite, marcasite, or asfm that oxidize and hydrate with the release of sulfate, and materials such as free lime CaO or free magnesia MgO in the cement or aggregate that progressively hydrate and carbonate.

When expansions in excess of those given in astm c227 Appendix of Specification C33 are shown in results of tests performed using this test method, it is strongly recommended that supplementary information be astm c227 to confirm that the expansion is actually due to alkali reactivity.