Abstract
In manufacturing of cement, industrial wastes are used for material and fuel. We anticipate increasing minor elements derived from industrial wastes. Minor elements in clinker are known to influence mineral composition of clinker and properties of cement. In this study, we investigated comparison between titanium oxide and diphosphorus pentaoxide. We prepared fifteen kinds of clinkers. These clinkers were same mineral composition estimated by Bogue equation but these clinkers contained different amount of titanium oxide and diphosphorus pentaoxide. As a result, Alite became decrease and belite increase with increasing titanium oxide content and diphosphorus pentaoxide content in clinker, but the trend of disphosphorus pentaoxide was remarkable compared with titanium oxide. For mineral composition of interstitial phase, there were differences between titanium oxide and diphosphorus pentaoxide. Aluminate became increase and ferrite became decrease with increasing of titanium oxide content in clinker. For clinker of containing diphosphorus pentaoxide, Aluminate became decrease with increasing of diphosphorus pentaoxide content in clinker and ferrite hardly varied. The mortar compressive strength became worse with increasing titanium oxide content and diphosphorus pentaoxide content in clinker, but the trend of disphosphorus pentaoxide was remarkable compared with titanium oxide. The decrease of mortar compressive strength resulted from decrease of alite. There were differences of distribution in clinker between titanium oxide and diphosphorus pentaoxide. Titanium exist in both silicate phase and interstitial phase, but phosphorus exist in only silicate phase.
