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Cylindrical specimens are required for the test. It is recommended to test at least two samples per concrete mixture. Specimens should be 96-102 mm (i.e. approximately 4-in.) in diameter. Concrete specimens should be 50 ± 1 mm (4-in.) thick. Mortar specimens should be 35-50 mm thick. Sample preparation and selection depend on the purpose of the test. Test specimens may be obtained from laboratory cast cylinders or cores extracted from existing structures. All specimens should be properly identified prior to testing. A companion specimen is needed for pore extraction. A further sample is needed for porosity measurement according to ASTM standard 642. These supplementary tests provide data for migration test analysis purposes. For relevant results, these additional samples should have identical histories (curing, exposure conditions, and storage conditions) to the testing samples.
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