Study on hydration reaction of titanium gypsum–titanium slag low clinker cement
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摘要: 为了探究利用钛石膏和钛矿渣制备低熟料水泥的可行性,研究其水化特性。采用钛石膏、钛矿渣、水泥熟料为主要原料,并用硅酸钠做为激发剂,配制10组低熟料水泥。对各组的抗压强度、软化系数、收缩率进行了测试,采用水化热分析、TG-DSC、XRD和SEM等测试方法对水化过程和水化产物进行了研究。结果表明,适当增加钛矿渣或水泥熟料的掺量可以提升水泥的抗压强度和软化系数,并能减小水泥的收缩。硅酸钠可以显著激发水泥的水化反应活性,促使生成更多的C-S(A)-H、AFt、CH等水化产物,从而提高抗压强度和软化系数,但过量掺入硅酸钠会造成收缩率增加。当钛石膏、钛矿渣、熟料和硅酸钠的比例为30∶55∶15∶8时,养护56 d的抗压强度达到51.3 MPa,软化系数为0.74,表现出了较好的力学性能和耐水性。Abstract: In order to explore the feasibility of using titanium gypsum and titanium slag to prepare low clinker cement and study its hydration characteristics, 10 groups of cement were prepared with titanium gypsum, titanium slag and cement clinker as the main raw materials and sodium silicate as the activator. The compressive strength, softening coefficient and shrinkage rate of each group were tested. The hydration process and hydration products were studied by hydration thermal analysis, TG-DSC, XRD and SEM. The results show that appropriate increase of titanium slag or clinker content can improve the compressive strength and softening coefficient of cement, and reduce the shrinkage of cement. Sodium silicate can significantly activate the hydration reactivity of cement, and promote the generation of more C-S(A)-H, AFt and CH, so as to improve the compressive strength and softening coefficient, but excessive incorporation of sodium silicate will cause an increase in shrinkage rate. With the ratio of titanium gypsum, titanium slag, clinker and sodium silicate of 30∶55∶15∶8, the compressive strength reached 51.3 MPa of 56 days after curing and the softening coefficient was 0.74, showing good mechanical properties and water resistance.
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Key words:
- titanium gypsum /
- titanium slag /
- cement /
- clinker /
- sodium silicate /
- hydration
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表 1 原材料的XRF分析结果
Table 1. XRF analysis results of raw materials
% 原料 CaO SiO2 TiO2 Al2O3 MgO Fe2O3 SO3 P2O5 Na2O K2O MnO 钛矿渣 26.06 21.76 17.69 13.57 7.13 3.22 2.91 0.05 0.81 0.55 0.45 钛石膏 36.22 2.90 1.20 1.58 1.62 13.56 41.95 0.37 0.10 0.07 0.27 熟料 68.17 18.54 0.67 4.44 1.40 3.57 1.68 0.12 0.31 0.83 0.10 表 2 试验配合比
Table 2. Experimental mix proportion
% 分组 序号 钛石膏 矿渣 熟料 硅酸钠 水灰比 备注 A组 A1 45 50 5 0 30 改变钛石膏与矿渣
比例及硅酸钠掺量A2 25 70 5 0 30 A3 25 70 5 3 30 A4 25 70 5 5 30 A5 25 70 5 8 30 B组 B1 30 60 10 0 30 改变矿渣与熟料
比例及硅酸钠掺量B2 30 55 15 0 30 B3 30 55 15 3 30 B4 30 55 15 5 30 B5 30 55 15 8 30 表 3 失重率统计
Table 3. Weight loss ratio statistics
试验组 各温度段失重率/% 累积失重率/% 30~110 ℃ 500~700 ℃ 700~900 ℃ A2 0.026 1.445 1.312 2.783 A3 0.316 2.271 4.636 7.223 A5 0.318 2.424 4.669 7.411 B2 0.735 3.666 5.181 9.582 B3 1.010 4.439 4.982 10.431 B5 2.755 4.554 4.136 11.445 -
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