Effects of a composition change of ordinary Portland cement on waste utilization and CO2 emissions in Japan

Abstract

This paper estimates the effects of a composition change of ordinary Portland cement on waste utilization and CO2 emissions in the Japanese cement industry based on the previous literature. It is estimated that increasing the aluminate phase content in clinker and using 10 mass% of mineral admixtures result in an increase of 74.6 g/kg-cement in waste use and a reduction of 56.3 g/kg-cement in CO2 emissions on the business-as-usual basis. This indicates a way to achieve both increase in waste use and reduction in CO2 emissions at the same time. Based on these results, it is estimated that CO2 emissions would be reduced by 2080 thousand tons in 2016 and 2140 thousand tons in 2030 from the business-as-usual values. Additionally, waste use for raw materials can be increased by 2760 thousand tons and 2850 thousand tons in respective years.