钛石膏-钛矿渣低熟料水泥水化反应研究

蒋勇; 苏姚彬; 高瑞; 吴茂杰; 蒋贇; 焦晓飞

doi:10.7513/j.issn.1004-7638.2023.04.016

钛石膏-钛矿渣低熟料水泥水化反应研究

doi: 10.7513/j.issn.1004-7638.2023.04.016

蒋勇^{1, 2,},
苏姚彬¹,
高瑞¹,
吴茂杰³,
蒋贇³,
焦晓飞⁴

1.
绵阳职业技术学院, 四川绵阳 621000
2.
环境友好能源材料国家重点实验室, 西南科技大学, 四川绵阳 621000
3.
四川砼兴源建材科技有限公司, 四川绵阳 621000
4.
山西职业技术学院，山西太原 030000

基金项目: 四川省功能复合材料产教融合示范基地建设项目；绵阳职业技术学院自然科学重点项目（MZ22ZD02、MZ22ZD01）；山西省高校科技创新项目（2020L0765）。

详细信息

作者简介:
蒋勇，男，1988年出生，四川南充人，博士，讲师，主要从事工业固废处理和化学外加剂研发，E-mail: jiangyong7586@163.com

中图分类号: X757
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出版历程
- 收稿日期: 2023-03-23
- 刊出日期: 2023-08-30

Study on hydration reaction of titanium gypsum–titanium slag low clinker cement

1.
Mianyang Polytechnic, Mianyang 621000, Sichuan, China
2.
State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China
3.
Sichuan Tong Xingyuan Building Material Technology Co. Ltd., Mianyang 621000, Sichuan, China
4.
Shanxi Polytechnic College, Taiyuan 030000, Shanxi, China

摘要

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。
- 钛石膏 /
- 钛矿渣 /
- 水泥 /
- 熟料 /
- 硅酸钠 /
- 水化反应
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.
- titanium gypsum /
- titanium slag /
- cement /
- clinker /
- sodium silicate /
- hydration

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图 1 原料激光粒度测试结果

Figure 1. Laser particle size analysis of raw materials

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图 2 原材料的XRD分析结果

Figure 2. XRD analysis of raw materials

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图 3 抗压强度测试结果

图中增长率表示56 d强度相比于3 d强度的增长率。

Figure 3. Compressive strength test

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图 4 软化系数测试结果

Figure 4. Softening coefficient test

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图 5 收缩率测试结果

Figure 5. Shrinkage test

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图 6 水化放热速率和放热量

Figure 6. Hydration heat release rate and total heat release analysis

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图 7 TG-DSC测试结果

Figure 7. TG-DSC analysis

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图 8 XRD测试结果

Figure 8. XRD patterns

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图 9 SEM测试结果

（a）A2；（b）A3；（c）A5；（d）B2；（e）B3；（f）B5

Figure 9. SEM images

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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

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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

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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/%
试验组	30～110 ℃	500～700 ℃	700～900 ℃	累积失重率/%
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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