Belite-based low-carbon clinker cements

摘要

A lite, as the most important constituent of normal Portland cement (PC) clinker, mostly accounts for 50-70 per cent of PC clinker mineralogical composition, while belite generally is 15-30 per cent. However, a study into the development of belite-based alternative clinkers has been ongoing for some time. The lower heat development and improved later-age strength of these clinkers was viewed as particularly beneficial in dam construction with mass concrete.1 The first successful use of belite-rich Portland cement (BPC) (ASTM C-150 Type IV, Low Heat Portland Cement) was applied in the construction of the Hoover Dam in the USA between 1931-36.1 However, BPC application was limited until the 1970s due to the construction industry's concerns of very low early-age strength.