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

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

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
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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: 2022-11-12
- 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 Jiao tong 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(20 JR5 RA426)

摘要

摘要: 地聚物以其在绿色低碳、力学特性、耐腐蚀和耐高温等方面比较突出，而且具有早高强和长寿命等优越性能，被认为是绿色环保的水泥替代品。在新型建筑材料、固废处理等领域吸引了越来越多的研究。相较于粉煤灰地聚物而言，偏高岭土地聚物的干缩率较大，并且通过掺杂其他矿物原料改善地聚物的收缩开裂相对乏力，严重阻碍了它的实际应用。本文通过将高达40wt%的硅灰石纤维替代偏高岭土制备出一系列地聚物试件，它不仅可以极大的优化地聚物孔隙结构，促进凝胶的致密化形成了更紧凑的N-A-S-H凝胶相，限制了水分从孔隙网络中蒸发，改善干缩开裂情况，同时对地聚物力学性能有较大改善，相较于偏高岭土原样力学性能最大提升36%。本文创新点在于使用超细硅灰石纤维可以提高地聚物的力学性能；硅灰石纤维大剂量的加入可以有效遏制宏观裂缝的产生；WS小剂量的添加会促进地聚过程，大剂量下对地聚物孔隙结构有劣化影响。1硅灰石纤维的加入对地聚物(a)孔隙结构和(b)干缩开裂的对比
- 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-day 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 ZK-1 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)的扫描电镜照片

Figure 1. Scanning electron microscopy images of wollastonite (WS)

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图 2 地聚物样品的XRD图谱

Figure 2. XRD patterns of geopolymer samples

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图 3 不同掺杂比例的地聚物的FT-IR图谱

Figure 3. FT-IR patterns 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 in geopolymer samples at 28 days of age

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图 5 28天龄期的地聚物试样的SEM图像

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

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图 6 地聚物试件的LF-NMR T2弛豫时间分布曲线

Figure 6. LF-NMR T2 relaxation time 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

No.	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
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, 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

No.	M	M9-G	W/M8-G	W2/M7-G	W3/M6-G	W4/M5-G
Porosity/%	31.05	27.91	27.29	28	28.29	28.48

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