聚乙烯纤维增强赤泥-碱矿渣复合材料的力学性能

阚黎黎; 朱嘉伦; 王飞; 李卓燃

doi:10.13801/j.cnki.fhclxb.20220104.003

聚乙烯纤维增强赤泥-碱矿渣复合材料的力学性能

doi: 10.13801/j.cnki.fhclxb.20220104.003

上海理工大学　环境与建筑学院，上海 200093

基金项目: 国家自然科学基金(51508329)

详细信息

通讯作者:
阚黎黎，博士，副教授，研究方向为高性能纤维增强复合材料　E-mail: kanlili1@163.com

中图分类号: TQ172
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- HTML全文浏览量: 181
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-10
- 修回日期: 2021-12-09
- 录用日期: 2021-12-24
- 网络出版日期: 2022-01-05
- 刊出日期: 2022-11-01

Mechanical properties of polyethylene fiber reinforced red mud-alkali slag composite

School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China

摘要

摘要: 为开发赤泥(RM)的资源化利用，采用RM混合矿渣与硅灰并掺加聚乙烯纤维制备中高强、高延性碱激发复合材料，研究其单轴拉伸及抗压性能，结合三点抗弯与单裂缝拉伸等细观试验探究材料的高延性机制，并通过XRD及FTIR分析水化产物。结果表明：聚乙烯纤维增强赤泥-碱矿渣复合材料的抗拉强度可以达到2.4 MPa，同时拥有3.5%的高拉伸应变性能；抗压强度可以达到近50 MPa的较高水平；细观试验得出的较大应变硬化性能指数P_SH对应较高拉伸应变；除水化硅酸钙(C-S-H)或水化硅铝酸钙(C-A-S-H)凝胶外，水化产物中还包含碱性硅铝酸盐(N-A-S-H)凝胶。
- 赤泥 /
- 碱激发材料 /
- 纤维 /
- 力学性能 /
- 高延性机制 /
- 水化产物
Abstract: To develop the resource utilization of red mud (RM), RM mixed with slag and silica fume along with addition of polyethylene fibers was used to prepare moderate-to-high strength and high ductile alkali-activated composite, and the macroscopic uniaxial tensile and compressive properties were investigated. The mechanisms of high ductility were explored by meso-scale experiments including three-point bending and single crack tensile tests. Meanwhile, the products of hydration reaction were analyzed through microscopic characterizing. The results show that the tensile strength of the studied material could be up to 2.4 MPa, along with a relatively high tensile strain capacity of 3.5%. The compressive strength could reach around 50 MPa. The larger pseudo strain-hardening P_SH indices obtained by meso-scale tests correspond to the higher tensile strain. Apart from calcium silicate hydrate (C-S-H) or calcium aluminosilicate hydrate (C-A-S-H) gels, the hydration products also contain alkaline aluminosilicate (N-A-S-H) gel.
- red mud /
- alkali activated material /
- fiber /
- mechanical properties /
- mechanism of high ductility /
- hydration product

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图 1 RM、GGBS和SF的粒径分布

Figure 1. Diameter distributions of RM, GGBS and SF

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图 2 狗骨试件尺寸

Figure 2. Dimensions of the dog-bone specimen

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图 3 三点抗弯试件尺寸

Figure 3. Dimensions of the three-point bending specimen

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图 4 单裂缝拉伸试件尺寸

Figure 4. Dimensions of single crack tensile specimen

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图 5 AAFRC的拉伸应力-应变曲线

Figure 5. Tensile stress-strain curves of AAFRC

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图 6 AAFRC的单裂缝拉伸应力-开口位移曲线

Figure 6. Stress-crack opening displacement curves of AAFRCfrom single crack tensile tests

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图 7 RM和GGBS (a) 及AAFRC (b) 的XRD图谱

Figure 7. XRD patterns of RM, GGBS (a) and AAFRC (b)

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图 8 AAFRC的FTIR图谱

Figure 8. FTIR spectra of AAFRC

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表 1 赤泥(RM)、矿渣(GGBS)及硅灰(SF)的化学组成

Table 1. Chemical compositions of red mud (RM), ground granulated blast furnace slag (GGBS) and silica fume (SF) wt%

Material	CaO	SiO₂	Al₂O₃	Fe₂O₃	MgO	SO₃	TiO₂	Na₂O	K₂O	P₂O₅
RM	0.46	10.18	17.43	53.79	0.12	0.76	–	7.74	0.07	0.20
GGBS	44.39	33.20	13.20	0.38	6.31	–	0.82	0.33	0.28	–
SF	0.49	92.26	0.89	1.97	0.96	–	–	0.42	1.31	–

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表 2 高延性碱激发纤维增强复合材料(AAFRC)配合比

Table 2. Mixture proportion of alkali-activated fiber reinforced composites (AAFRC)

Mixture	RM/wt%	SF/wt%	GGBS/wt%	Sand/wt%	NaOH/wt%	Na₂SiO₃/wt%	Water/wt%	Polyethylene (PE) fiber/vol%
PE/GGBS-SF	0.00	10.33	44.77	14.50	3.00	13.70	12.60	1.90
PE/RM-GGBS-SF	22.04	6.20	26.86	14.50	3.00	13.70	12.60	1.90

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表 3 AAFRC的拉伸性能

Table 3. Tensile properties of AAFRC

Mixture	Initial cracking strength/MPa	Tensile strength/MPa	Tensile strain/%
PE/GGBS-SF	2.15±0.13	3.30±0.13	3.07±0.32
PE/RM-GGBS-SF	1.89±0.41	2.43±0.04	3.58±0.11

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表 4 AAFRC抗压强度

Table 4. Compressive strength of AAFRC

Mixture	Compressive strength/MPa
PE/GGBS-SF	69.13±2.16
PE/RM-GGBS-SF	48.83±1.86

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表 5 AAFRC的基体断裂韧度与基体断裂能

Table 5. Matrix fracture toughness and fracture energy of AAFRC

Mixture	Mass m/kg	Peak load F_Q/kN	K_m/(MPa·m^1/2)	J_tip/(J·m⁻²)
PE/GGBS-SF	1.99±0.06	0.27±0.03	0.30±0.05	5.05±0.23
PE/RM-GGBS-SF	2.03±0.05	0.23±0.04	0.26±0.07	4.28±0.75
Notes: K_m—Fracture toughness of matrix; J_tip—Fracture energy of matrix.

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表 6 AAFRC单裂缝拉伸试验结果与强度指数P_SHS及能量指数P_SHE

Table 6. Results from single crack tensile test and strength index P_SHS and energy index P_SHE of AAFRC

Mixture	Peak stress σ_oc/MPa	Crack opening δ_oc/mm	J_b′/(J·m⁻²)	P_SHS	P_SHE
PE/GGBS-SF	3.14±0.05	0.24±0.04	50.23±37.33	1.47±0.11	10.30±7.86
PE/RM-GGBS-SF	3.03±0.09	0.20±0.07	63.58±24.83	1.72±0.39	16.37±8.67
Notes: J_b′—Complementary energy of fibers.

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