高掺量硅灰石纤维对偏高岭土基地聚物性能和微结构的影响

张全超; 黄大建; 张小鹏; 强小虎; 路旭斌; 林龙沅

doi:10.13801/j.cnki.fhclxb.20221108.002

高掺量硅灰石纤维对偏高岭土基地聚物性能和微结构的影响

doi: 10.13801/j.cnki.fhclxb.20221108.002

1.
兰州交通大学　材料科学与工程学院，兰州 730070
2.
西南科技大学　环境与资源学院，绵阳 621000

基金项目: 甘肃省自然科学基金(20JR5RA426)

详细信息

通讯作者:
黄大建，博士，副教授，硕士生导师，研究方向为建筑材料、地质聚合物、生物材料、矿物材料　E-mail: huangdj2015@yeah.net

中图分类号: TB321；TB333
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-31
- 修回日期: 2022-10-25
- 录用日期: 2022-11-03
- 网络出版日期: 2022-11-10
- 刊出日期: 2023-08-15

Effect of high wollastonite fiber incorporation on metakaolin base geopolymers' properties and microstructure

1.
School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2.
College of Environment and Resources, Southwest University of Science and Technology, Mianyang 621000, China

Funds: National Natural Science Foundation of Gansu Province (20JR5RA426)

摘要

摘要: 为了研究高添加量的硅灰石纤维对偏高岭土-矿渣地聚物力学性能及开裂特性的影响，以硅灰石纤维替代质量分数(最高40wt%)为实验参数，制备了硅灰石/偏高岭土-矿渣地聚物，评估了与硅灰石含量有关的性能(力学强度、孔隙率和裂纹)，并研究了硅灰石纤维对地聚物微结构的影响。结果表明：硅灰石纤维的加入对处于干燥环境下的地聚物抑制开裂行为有积极作用，且在替代量为40wt%以内是持续改善的；同时也观察到硅灰石纤维的加入对地聚物力学性能也有积极影响，其中硅灰石纤维替代量为20wt%的地聚物28天强度达到70.2 MPa，较偏高岭土基地聚物样品抗压强度增长了36%，但继续增加硅灰石纤维会导致地聚物抗压强度的降低；此外沸石相在复合物中被检测到，硅灰石的添加有利于沸石相的发展。
- 地聚物 /
- 硅灰石纤维 /
- 偏高岭土 /
- 裂纹 /
- 低场核磁
Abstract: In order to study the effect of high addition of wollastonite fiber on the mechanical properties and cracking characteristics of metakaolin/slag geopolymer, wollastonite-metakaolin-slag geopolymer was prepared with the substitution mass fraction of wollastonite fiber (up to 40wt%) as the experimental parameter. The properties related to the content of wollastonite (mechanical strength, porosity and crack) were evaluated, and the effect of wollastonite fiber on the microstructure of geopolymer was studied. The results show that the addition of wollastonite fiber has a positive effect on inhibiting the cracking behavior of the geopolymer in dry environment, and it is continuously improved when the substitution amount is less than 40wt%. At the same time, it is also observed that the addition of wollastonite fiber has a positive effect on the mechanical properties of the geopolymer. The 28 days strength of the geopolymer with the substitution amount of wollastonite fiber of 20wt% reaches 70.2 MPa, which is 36% higher than the original compressive strength of metakaolin-based geopolymer. However, the continuous increase of wollastonite fiber will lead to the decrease of the compressive strength of the geopolymer. In addition, zeolite was detected in the composite, and the addition of wollastonite was beneficial to the development of zeolite phase.
- geopolymer /
- wollastonite fibers /
- metakaolin /
- cracking behavior /
- LF-NMR

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图 1 硅灰石(WS)的SEM图像

Figure 1. SEM images of wollastonite (WS)

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图 2 地聚物样品的XRD图谱

W—Wollastonite, CaSiO₃; Q—Quartz, SiO₂; C—Corundum, Al₂O₃; Ca—Calcite, Ca₆C₃O₁₈; Z—Zeolites, Na₉₆Al₉₆Si₉₆O₃₈₄·216H₂O; T—Thermonatrite, Na₂CO₃·H₂O

Figure 2. XRD patterns of geopolymer samples

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图 3 不同掺杂比例的地聚物的FTIR图谱

Figure 3. FTIR spectra of geopolymers with different doping ratios

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图 4 28天龄期的地聚物试样的宏观裂缝

Figure 4. Macroscopic cracks of geopolymer samples kept for 28 days

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图 5 28天龄期的地聚物试样的SEM图像

ITZ—Interface transition zone

Figure 5. SEM images of geopolymer samples kept for 28 days

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图 6 地聚物试件的低场核磁共振(LF-NMR) 横向弛豫时间(T2)分布曲线

Figure 6. Low-field nuclear magnetic resonance (LF-NMR) transversal relaxation time (T2) distribution curves of geopolymer samples

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图 7 地聚物试件的热重分析

Figure 7. Thermogravimetric analyses of geopolymer samples

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图 8 地聚物试件的TG和DSC曲线

Figure 8. TG and DSC curves of geopolymer samples

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图 9 3天、7天和28天固化的地聚物样品的抗压强度

Figure 9. Compressive strengths of 3 days, 7 days and 28 days cured geopolymer samples

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表 1 原料的主要成分及含量

Table 1. Main compositions and content of materials (wt%)

Material	SiO₂	Al₂O₃	Fe₂O₃	MgO	CaO
Metakaolin (MK)	47.83	43.54	3.55	0	0.68
Slag (GGBFS)	31.26	13.63	1.13	6.34	40.20
Wollastonite (WS)	41.84	0.32	0.31	1.77	54.89

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表 2 原料的混合比例

Table 2. Geopolymer mixture proportion

Number	MK/g	GGBFS/g	WS/g	AA/g
M	100	0	0	100
M9-G	90	10	0	100
W/M8-G	80	10	10	100
W2/M7-G	70	10	20	100
W3/M6-G	60	10	30	100
W4/M5-G	50	10	40	100
Notes: MK and GGBFS were used as the matrix phase and WS as the reinforcing phase. They are denoted by M, G and W in the specimen numbering. As an example, 100 g AA (alkali activator), 50 g MK, 10 g GGBFS and 40 g WS are required to prepare W4/M5-G.

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表 3 LF-NMR测得的地聚物孔隙度

Table 3. LF-NMR porosity of geopolymer samples

Number	Porosity/%
M	31.05
M9-G	27.91
W/M8-G	27.29
W2/M7-G	28.00
W3/M6-G	28.29
W4/M5-G	28.48

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