The Role of Brownmillerite in Preparation of High-Belite Sulfoaluminate Cement Clinker

Abstract

High-belite sulfoaluminate cement (HBSC) clinker containing brownmillerite was prepared using the industrial raw materials limestone, aluminum tailings, aluminum ore waste rock, and anhydrite. The effect of brownmillerite on clinker sintering and clinker minerals and the mechanical performance of HBSC was investigated using thermal analysis, petrographic analysis, and quantitative X-ray diffraction (QXRD). Results indicated that brownmillerite promoted the formation of clinker minerals and stabilized calcium sulfoaluminate (C4A3$) through the substitution of Fe3+ for Al3+ in C4A3$, which increased the actual C4A3$ content and decreased the brownmillerite content compared to that of the designed theoretical mineral composition. However, the early compressive strength of HBSC pastes decreased with the increase in brownmillerite content due to the decrease in the total amount of early-strength clinker minerals. Brownmillerite also influenced belite (C2S) structures and increased the γ-C2S content with poor hydration activity, thus inhibiting the strength development of HBSC pastes. The proper amount of brownmillerite in HBSC clinker can ensure the early strength and strength development of HBSC pastes.

Substitution preference of chromium ions in the clinker phase of ordinary Portland cement

“…A key limitation of utilizing these solid wastes is that impurities may enter the clinker during the sintering process and affect its performance in later service life. [16][17][18] Therefore, to better utilize these solid wastes, it is necessary to study the exact forms and solution behaviours of impurity ions in cement clinker phases.…”

The Valorisation of Selected Quarry and Mine Waste for Sustainable Cement Production within the Concept of Circular Economy

“…Mine and quarry waste such as stockpiles of sub-ore, marginal ore, waste rock or tailings are typically rich in oxides of silicon, aluminium, calcium, and iron [22] which are also the main constituents of BCSA clinker and cement. There is a substantial sample of papers that have examined the possibilities to use phosphate rocks [23], Pb-Zn ore tailings [24], aluminium tailings, and aluminium ore waste rock [25], but little information on the utilization of limestone quarry waste for synthesis low CO 2 cements, especially BCSA. This research aimed to examine the potential of incorporating selected mine and quarry waste into cement clinker raw mixtures as secondary raw materials (SRM) to produce sustainable belite-sulfoaluminate cement (BCSA).…”