Highways Agency Reports

The existing method for determining the polished-stone value (PSV) of an aggregate requires the use of particles passing the 10mm test sieve and retained on the 14 mm to 10mm flake sorting sieve. In order to determine the PSV of a number of samples of 20mm uncoated and pre-coated chippings which are too large to prepare standard test specimens, test specimens made up by breaking aggrigate particules in half to expose new faces were tested using the otherwise standard procedure. The results of these tests are discussed and compared to the standard PSV value.