This British Standard, a part of the BS 812 series, describes the method for determining the polished-stone value (PSV) of an aggregate.
The main changes from the previous edition of this British Standard are the following:
a) The procedure for mounting the aggregate in a sand cement mortar is no longer described; only the resin mounting method is to be used.
b) The previous method determined an average value from four specimens conditioned on one test run. The revised method requires the conditioning of four specimens in two pairs on two separate test runs.