The current permissible variation in dimensions for fly ash brick is 1/16 inch. Fly ash brick are manufactured on the same equipment used to manufacture concrete block (covered under ASTM C90) and concrete brick (covered under ASTM C1634 and C55). The permissible variation in dimensions for these concrete units is 1/8 inch. This ballot item proposes to change the permissible variation in dimensions to fly ash brick to 1/8 inch so that it is consistent with the requirements of other units made on the same equipment.
Keywordsabsorption; brick; compressive strength; durability; fly ash; fly ash brick; fly ash facing brick; fly ash masonry units; freeze thaw; linear drying shrinkage;