ASTM C441/C441M-17 PDF Download

ASTM C441/C441M-17 is a standard test method used to evaluate the effectiveness of pozzolans or ground blast-furnace slag in preventing excessive expansion of concrete due to the alkali-silica reaction. The test can be used as a preliminary screening test to compare the relative effectiveness of different materials, or as a test to evaluate specific materials proposed for use in preventing excessive expansion on a particular job.

The test involves creating mortar bars with reactive aggregates and a combination of portland cement and the pozzolan or slag being tested. These bars are then stored under prescribed conditions and the expansion developed in the bars is measured. The results of the test can help determine the suitability of the pozzolan or slag in preventing excessive expansion caused by the reaction between aggregates and alkalies in the cement mixtures.

It is important to note that this test method does not assess the overall suitability of pozzolans or slag for use in concrete. These materials should comply with specific ASTM specifications (C618, C989/C989M, or C1240) to ensure their suitability for use in concrete applications.