FINE AGGREGATE (CONCRETING SAND OR SHARP SAND)
‘Concreting sand’, ‘sharp sand’ or ‘fine aggregate’ are all terms that are used to describe natural sand, crushed stone, sand or similar, which pass through a 5mm sieve but tend to be coarser and not as well graded as the soft sands used in mortars. It is often referred to as ‘fine aggregate’ to distinguish it from soft sand. Being coarser than soft sand, it is not used for mortars as it produces an unworkable mix and causes difficulties in achieving a good finish when jointing.
Fig. 3 Sharp sand.