This Standard sets out the methods for determining the coefficients of contraction of masonry units. The coefficient of residual curing contraction is an indication of the potential shrinkage undergone by a masonry unit during its secondary curing process. The coefficient of drying contraction is an indication of the potential contraction undergone by a saturated masonry unit when it is allowed to dry over a long period at ambient conditions. NOTE: For ease of use, the methods of determining residual curing contraction and drying contraction have been separated in this Standard, even though masonry units would most likely be tested for both properties consecutively.

Under Revision see DR 02583 CP First published in Australia as part of Int 306-1948.Revised and redesignated in part as AS A87-1963 and AS 1346-1973.AS A87-1963 revised and redesignated AS 1500-1974.AS 1346-1973 and AS 1500-1974 revised, amalgamated and redesignated AS 2733-1984.Jointly revised and redesignated in part as AS/NZS 4456.12:1997. First published in Australia as part of Int 306-1948. Revised and redesignated in part as AS A87-1963 and AS 1346-1973. AS A87-1963 revised and redesignated AS 1500-1974. AS 1346-1973 and AS 1500-1974 revised, amalgamated and redesignated AS 2733-1984. Jointly revised and redesignated in part as AS/NZS 4456.12:1997.