Abstract
Although increasing the amount of minor additional constituents in ordinary Portland cement (OPC) is one of the effective approaches for reducing the CO2 emissions from cement industry, it naturally reduces the amount of use of alternative waste raw materials due to the decreased clinker ratio in cement. Cement clinker with a higher aluminate phase may possibly achieve CO2 emissions reduction without reducing the waste use, but its effect on the cement and concrete quality has not been made clear enough.
In this study, a variety of blended cements containing different types of minor additive constituents in different amounts were prepared by using six base cements varied in clinker compositions and fineness and three minor additional constituents, and the physical properties and environmental impact of the blended cements were thoroughly investigated. The results showed that it was possible to reduce CO2 emissions and increase the amount of waste use while maintaining adequate quality of cement by increasing the amount of aluminate in the base cement by 1 to 2% compared to the conventional OPC and increasing the minor additional constituents to 10%.
