Effect of barium oxide on the formation and coexistence of tricalcium silicate and calcium sulphoaluminate

Abstract

Formation and coexistence of tricalcium silicate (C₃S) and calcium sulphoaluminate (C₄A₃$\bar S$) minerals in Portland cement clinker containing calcium sulphoaluminate were investigated. The f-CaO content, mineral composite and formation of mineral in the clinker were analyzed respectively by chemical analysis, differential scanning calorimetry(DSC) and X-ray diffraction. The results show that, adding a suitable amount of BaO can improve the burnability of raw meal and promote the f-CaO absorption. Tricalcium silicate and calcium sulphoaluminate minerals can form and coexist in clinkers at 1 234–1 317 °C by the addition of BaO to the raw meal. A suitable amount of BaO expanded the coexistence temperature of two minerals by 58 °.

Keywords

barium oxide / tricalcium silicate / calcium sulphoaluminate / coexistence temperature

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