1.1 This specification covers aggregate for use in masonry mortar.1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 The following precautionary caveat pertai This specification covers aggregate for use in masonry mortar. Aggregate for use in masonry mortar shall consist of natural sand or manufactured sand. Manufactured sand is the product obtained by crushing stone, gravel, or air-cooled iron blast-furnace