ABSTRACT
Limestone has long been used in the construction industry as an aggregate for concrete and asphalt concrete. Its use in the cement industry as a raw material for PC is almost 200 years old. In powdered form, limestone has also been used for a long time in masonry cements for mortars and plasters. This use was standardised as early as 1932 (ASTM C 91, 2003). Incorporating limestone powder into PC dates back to the 1970s and currently its use in cements has become almost a common practice throughout the world (Erdoğdu, 2002). ASTM C 150 (2012) allows upto 5% limestone powder in PC whereas EN 197-1 (2012) specifies cements that may contain upto 35% limestone powder, besides using it as a minor additional constituent (<5%) in all types of common cements.
