The use of titanium gypsum instead of gypsum as a raw material for the preparation of gypsum-slag cementitious materials (GSCM) can reduce the cost and improve the utilization of solid waste. However, titanium gypsum contains impurities such as Fe2O3, MgO, and TiO2, which make its effect on the performance of GSCM uncertain. To investigate this issue, GSCM doped with different ratios of Fe2O3, MgO, and TiO2 were prepared in this study, the setting time and the strength of GSCM at 3, 7, and 28 days were tested. The effects of different oxides on the performance of GSCM were also investigated by scanning electron microscopy, energy spectrum analysis, X-ray diffraction analysis, and thermogravimetric analysis. The experimental results showed that Fe2O3, MgO, and TiO2 all had a certain procoagulant effect on GSCM and a slight effect on the strength. Through micro-analysis, it was found that the main hydration products of GSCM were AFt phase and calcium–alumina–silicate–hydrate (C–(A)–S–H) gels. Fe-rich C–(A)–S–H gels were observed with the addition of Fe2O3, and Mg(OH)2 and M–S–H gels were observed with the addition of MgO. The addition of TiO2 did not result in new hydration products from GSCM.

中文翻译：

---

钛石膏中杂质成分对石膏矿渣胶凝材料凝结时间及力学性能的影响

用钛石膏代替石膏作为原料制备石膏矿渣胶凝材料（GSCM）可以降低成本，提高固体废物的利用率。但钛石膏中含有Fe等杂质2氧3、 MgO 和 TiO2，这使得其对 GSCM 性能的影响具有不确定性。为了研究这个问题，GSCM 掺杂了不同比例的 Fe2氧3、 MgO 和 TiO2本研究制备了GSCM的凝结时间和3、7和28天的GSCM强度。通过扫描电子显微镜、能谱分析、X射线衍射分析和热重分析研究了不同氧化物对GSCM性能的影响。实验结果表明，Fe2氧3、 MgO 和 TiO2均对GSCM有一定的促凝血作用，对强度有轻微影响。通过微量分析发现，GSCM的主要水化产物是AFt相和钙-氧化铝-硅酸盐-水合物(C-(A)-S-H)凝胶。添加 Fe 后观察到富含 Fe 的 C–(A)–S–H 凝胶2氧3和 Mg(OH)2添加 MgO 后观察到 M-S-H 凝胶。添加TiO22并没有从 GSCM 中产生新的水合产品。