碳化养护对掺电石渣水泥石性能的影响

秦玲; 毛星泰; 谢期劼; 崔祎菲; 鲍玖文; 陈铁锋; 高小建; 张鹏

doi:10.13801/j.cnki.fhclxb.20230616.003

碳化养护对掺电石渣水泥石性能的影响

doi: 10.13801/j.cnki.fhclxb.20230616.003

秦玲^{1, 2, 3},
毛星泰¹,
谢期劼¹,
崔祎菲¹,
鲍玖文¹,
陈铁锋⁴,
高小建⁴,
张鹏^1, ,

1.
青岛理工大学　土木工程学院，青岛 266525
2.
西安建筑科技大学　土木工程博士后科研流动站，西安 710055
3.
青岛青建新型材料集团有限公司，青岛 266108
4.
哈尔滨工业大学　土木工程学院，哈尔滨 150090

基金项目: 国家重点研发计划项目(2021YFB2600704)；国家自然科学基金(52208260)；山东省自然科学基金(ZR2022QE002)

详细信息

通讯作者:
张鹏，博士，教授，博士生导师，研究方向为混凝土耐久性　E-mail：peng.zhang@qut.edu.cn

中图分类号: TQ172.1；TB332
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- 文章访问数: 544
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- 被引次数: 0
出版历程
- 收稿日期: 2023-04-17
- 修回日期: 2023-05-16
- 录用日期: 2023-05-27
- 网络出版日期: 2023-06-19
- 刊出日期: 2024-02-01

Effect of carbonation curing on the performance of cement paste added with carbide slag

1.
School of Civil Engineering, Qingdao University of Technology, Qingdao 266525, China
2.
Post-doctoral Mobile Stations of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China
3.
Qingdao Qingjian New Material Group CO., LTD., Qingdao 266108, China
4.
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China

Funds: National Key Research and Development Program of China (2021YFB2600704); National Natural Science Foundation of China (52208260); Natural Science Foundation of Shandong Province (ZR2022QE002)

摘要

摘要: 为降低水泥行业的碳足迹同时回收利用电石渣，本文将电石渣作为掺合料加入碳化养护水泥中，研究了碳化养护对掺电石渣水泥石抗压强度、干燥收缩、氯离子渗透等性能的影响，并利用X射线衍射、热分析、压汞法、扫描电镜等测试手段对水泥石的微观结构进行了分析。结果表明：碳化养护提高了掺电石渣水泥石的抗压强度及抗氯离子侵蚀性能，使其电通量降低了38.17%~50.08%，56天干燥收缩率降低了8.8%~25.2%，细化了其孔结构。在保证水泥石强度不降低的前提下，约10%的电石渣可以被资源化利用，同时水泥石的固碳率可达11.19%~15.87%。利用碳化养护达到了捕捉固化二氧化碳、资源化利用电石渣、提升水泥石性能的目的。
- 电石渣 /
- 水泥基材料 /
- 碳化养护 /
- 抗压强度 /
- 微观结构
Abstract: In order to reduce the carbon footprint of cement industry and recycle carbide slag, carbide slag was added into carbonation curing cement as the mineral admixture. The influence of carbonation curing on the compressive strength, drying shrinkage, chloride ion penetration of cement paste added with carbide slag was studied, and the microstructure of cement paste was analyzed by X-ray diffraction, thermal analysis, mercury intrusion porosimetry, scanning electron microscopy, etc. The results show that carbonation curing can improve the compressive strength and chloride ion erosion resistance of cement paste added with carbide slag, reduce the electric flux by 38.17%-50.08%, reduce the 56 days drying shrinkage by 8.8%-25.2%, and refine the pore structure. About 10% of carbide slag can be used as resource under the premise that the strength of cement paste is not reduced, and the carbon fixation rate of cement paste can reach 11.19%-15.87%. The purpose of capturing and solidifying carbon dioxide, recycling carbide slag and improving the performance of cement paste are achieved by carbonation curing.
- carbide slag /
- cement-based materials /
- carbonation curing /
- compressive strength /
- micro-structure

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图 1 CS的XRD图谱

Figure 1. XRD pattern of CS

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图 2 PO和CS的粒径分布

Figure 2. Particle size distribution of the PO and CS

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图 3 CS的SEM图像

Figure 3. SEM image of CS

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图 4 掺加不同掺量CS的水泥石抗压强度

Figure 4. Compressive strength of cement stone with different amounts of CS added

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图 5 PO-CS 净浆不同龄期的干燥收缩

Figure 5. Dry shrinkage of PO-CS paste at different ages

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图 6 掺电石渣的水泥砂浆氯离子渗透性能

Figure 6. Chloride ion permeability of cement mortar dopedwith calcium carbide slag

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图 7 不同龄期的CS水泥石XRD图谱

Aft—Ettringite; C₂S—Dicalcium silicate; C₃S—Tricalcium silicate

Figure 7. XRD patterns of CS cement stone for different ages

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图 8 PO-CS 净浆不同龄期的TG-DTA曲线

Figure 8. TG-DTA curves of PO-CS pastes at various ages

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图 9 PO-CS浆体不同龄期微分孔隙度曲线

dV/dlgD—Pore volume

Figure 9. Pore size distribution of PO-CS pastes at various ages

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图 10 PO-CS浆体不同龄期累积孔隙度

Figure 10. Cumulative porosity curves of PO-CS pastes at various ages

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图 11 PO-CS净浆的SEM图像

Figure 11. SEM images of PO-CS pastes

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表 1 普通硅酸盐水泥(PO)和电石渣(CS)的化学组成 (wt%)

Table 1. Chemical composition of ordinary portland cement (PO) and carbide slag (CS) (wt%)

Composite	CaO	SiO₂	Al₂O₃	Fe₂O₃	MgO	SO₃	Na₂O	K₂O	TiO₂
PO	58.36	21.34	8.22	4.12	3.50	1.23	0.78	0.47	0.35
CS	93.50	3.02	1.60	0.63	0.10	0.88	0.01	0.04	0.07

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表 2 水泥石的加速碳化结果

Table 2. Accelerated carbonation results of cement paste

Items	Curing age/d	Uncarbonated (Control)			Carbonated
Items	Curing age/d	0%	20%	50%	0%	20%	50%
Ca(OH)₂/wt%	1	2.23	2.93	5.72	2.08	2.71	5.61
	7	2.31	3.69	6.66	2.18	3.58	5.87
	28	2.61	4.71	7.52	2.48	4.11	6.89
Well-crystallinity CaCO₃/wt%	28	4.17	5.78	6.35	4.91	7.72	8.55
Poor-crystallinity CaCO₃/wt%	28	2.69	2.01	1.82	3.46	2.94	2.74
WC/PC	28	0.64	0.34	0.28	0.70	0.38	0.32
CO₂ adsorption capacity/wt%	—	—	—	—	11.19	14.62	15.87
Notes: WC—Well-crystallinity; PC—Poor-crystallinity.

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表 3 PO-CS 浆体孔结构参数

Table 3. Pore structure parameters of PO-CS pastes

Curing age/d	Group		Porosity /%	Pore size distribution/%
Curing age/d	Group		Porosity /%	<20 nm	20-50 nm	50-100 nm	100-1000 nm	>1000 nm
1	Uncarbonated	0	26.7	21.3	16.3	13.4	39.5	9.5
	Uncarbonated	50%	50.6	14.5	12.5	8.7	44.8	19.2
	Carbonated	0	25.4	22.0	16.8	20.1	37.3	3.7
	Carbonated	50%	43.7	14.7	13.5	10.5	42.0	18.9
7	Uncarbonated	0	21.1	28.7	16.9	15.9	34.1	4.4
	Uncarbonated	50%	42.8	24.4	17.3	13.6	27.7	17.0
	Carbonated	0	19.3	28.7	19.2	17.4	27.7	6.9
	Carbonated	50%	40.2	24.1	18.5	15.4	30.1	11.9
28	Uncarbonated	0	18.7	26.3	18.7	21.4	24.0	9.6
	Uncarbonated	50%	39.08	29.1	23.5	14.9	24.1	8.4
	Carbonated	0	16.8	30.4	20.8	26.3	18.6	3.7
	Carbonated	50%	37.1	31.4	23.9	17.3	21.0	6.3

下载: 导出CSV

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