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赤泥取代率对三元全固废地聚物性能的影响

王家全 孟廷宇 畅振超 唐毅

王家全, 孟廷宇, 畅振超, 等. 赤泥取代率对三元全固废地聚物性能的影响[J]. 复合材料学报, 2024, 43(0): 1-13.
引用本文: 王家全, 孟廷宇, 畅振超, 等. 赤泥取代率对三元全固废地聚物性能的影响[J]. 复合材料学报, 2024, 43(0): 1-13.
WANG Jiaquan, MENG Tingyu, CHANG Zhenchao, et al. Effect of red mud substitution rate on the properties of ternary solid waste geopolymers[J]. Acta Materiae Compositae Sinica.
Citation: WANG Jiaquan, MENG Tingyu, CHANG Zhenchao, et al. Effect of red mud substitution rate on the properties of ternary solid waste geopolymers[J]. Acta Materiae Compositae Sinica.

赤泥取代率对三元全固废地聚物性能的影响

基金项目: 国家自然科学基金 (52468047);广西自然科学基金重点项目(2022GXNSFDA035081);广西高等学校高水平创新团队及卓越学者计划项目(桂教人才〔2020〕6号);2022年度交通运输行业重点科技项目(2022-MS1-030);广西科技大学研究生教育创新计划项目(GKYC202463)
详细信息
    通讯作者:

    王家全,博士,教授,博士生导师,研究方向为地聚物注浆材料和土工合成材料 E-mail: wjquan1999@163.com

  • 中图分类号: U414;TB332

Effect of red mud substitution rate on the properties of ternary solid waste geopolymers

Funds: National Natural Science Foundation of China (52468047); Natural Science Foundation of Guangxi Province of China (2022GXNSFDA035081); High Level Innovation Team and Outstanding Scholars Program of Guangxi Institutions of Higher Learning of China (GuiJiaoRenCai[2020]6); Key technology project of transportation industry in 2022 (2022-MS1-030); Graduate Education Innovation Program Project of Guangxi University of Science and Technology (GKYC202463)
  • 摘要: 为进一步提升赤泥(Red mud,RM)综合利用率,本文将赤泥掺入矿渣-粉煤灰基地聚物中制备了三元全固废地聚物(Ternary solid waste geopolymer,TSWG)材料,研究了不同赤泥取代率对TSWG的力学性能及和易性的影响,结合X射线衍射(XRD)和扫描电子显微镜(SEM)测试,重点探讨了不同取代率赤泥对TSWG性能影响机制,并对TSWG砂浆的成本效益和环境影响进行了评估。结果表明,高掺量的赤泥能够促进铝硅酸盐材料的解聚过程,与基准组(赤泥掺量为0wt%)相比,40wt%赤泥掺量的TSWG的初凝时间缩短了113 min;随着赤泥取代率的增加,提高了地聚物的聚合反应程度,体系中出现了越来越多的硅酸二钙、石英等晶体,破坏地聚物材料的原有结构,导致抗压强度逐渐下降;20wt%赤泥取代率下TSWG28 d抗压强度达34.2 MPa,浆液初始流动度为254 mm,与普通波特兰水泥砂浆相比,具有更好的经济效益和环境效益,以及更方便的制备方法。

     

  • 图  1  赤泥、矿渣和粉煤灰的XRD图谱

    Figure  1.  XRD patterns of red mud, slag, and fly ash

    图  2  原材料的粒径分布图

    Figure  2.  Particle size distribution map of materials

    图  3  原材料的SEM图像:(a)赤泥;(b)矿渣;(c)粉煤灰

    Figure  3.  SEM images of materials:(a)Red mud;(b)Slag;(c)Fly ash

    图  4  不同赤泥取代率对TSWG凝结时间的影响

    Figure  4.  Effect of different red mud substitution rates on the setting time of TSWG

    图  5  不同赤泥取代率对TSWG流动度的影响

    Figure  5.  Effect of different red mud substitution rates on TSWG flowability

    图  6  赤泥取代率对TSWG抗压强度的影响

    Figure  6.  Effect of red mud substitution rate on the compressive strength of TSWG

    图  7  赤泥取代率对TSWG抗折强度的影响

    Figure  7.  Effect of red mud substitution rate on the flexural strength of TSWG

    图  8  不同赤泥取代率的TSWG在3 d、7 d时的XRD图谱:(a)3 d;(b)7 d

    Figure  8.  XRD patterns of TSWG with different red mud substitution rates at 3 and 7 days:(a)3 d;(b)7 d

    图  9  不同龄期不同赤泥取代率下TSWG中各种矿物相含量:(a) 3 d;(b) 7 d

    Figure  9.  Content of various mineral phases in TSWG under different red mud replacement rates at different ages: (a) 3 d; (b) 7 d

    图  10  养护3 d时TSWG的SEM图像:(a) 0 wt%RM,养护3 d;(b) 10 wt%RM,养护3 d;(c) 20 wt%RM,养护3 d;(d) 30 wt%RM,养护3 d;(e) 40 wt%RM,养护3 d

    Figure  10.  SEM images of TSWG curing for 3 d: (a) 0 wt%RM,curing for 3 d; (b) 10 wt%RM,curing for 3 d; (c) 20 wt%RM,curing for 3 d; (d) 30 wt%RM,curing for 3 d; (e) 40 wt%RM,curing for 3 d

    图  11  养护7 d时TSWG的SEM图像:(a) 0 wt%RM,养护7 d;(b) 10 wt%RM,养护7 d;(c) 20 wt%RM,养护7 d;(d) 30 wt%RM,养护7 d;(e) 40 wt%RM,养护7 d

    Figure  11.  SEM images of TSWG curing for 7 d: (a) 0 wt%RM,curing for 7 d; (b) 10 wt%RM,curing for 7 d; (c) 20 wt%RM,curing for 7 d;(d) 30 wt%RM,curing for 7 d; (e) 40 wt%RM,curing for 7 d

    表  1  赤泥、矿渣和粉煤灰的化学成分(wt%)

    Table  1.   Chemical composition of red mud, slag, and fly ash (wt%)

    Material Na2O MgO Al2O3 SiO2 P2O5 SO3 K2O CaO TiO2 MnO Fe2O3 ZrO2
    Slag 0.47 8.58 15.24 30.54 0.01 2.08 0.45 40.75 0.73 0.58 0.31 0.04
    Red mud 2.02 1.46 9.39 22.12 0.23 1.84 0.51 45.43 3.46 0.06 12.79 0.16
    Fly ash 0.50 0.48 38.26 48.72 0.41 1.68 1.20 2.99 1.51 0.04 3.76 0.09
    下载: 导出CSV

    表  2  三元全固废地聚物(TSWG)浆液配合比

    Table  2.   Mix ratio of ternary solid waste geopolymer(TSWG) slurry

    Group Slag content/wt% Fly ash content/wt% Red mud dosage/wt% Sodium silicate content
    (relative to cementitious materials)/wt%
    Water-glue ratio
    0 wt%RM 60 40 0 8.54 0.5
    10 wt%RM 60 30 10
    20 wt%RM 60 20 20
    30 wt%RM 60 10 30
    40 wt%RM 60 0 40
    下载: 导出CSV

    表  3  3 d不同赤泥取代率下TSWG中各种矿物相含量(wt%)

    Table  3.   Content of various mineral phases in TSWG under different red mud replacement rates for three days (wt%)

    Group Mullite Calcite Clinotobermorite Quartz Hematite Calcio
    0 wt%RM 44.4 15.8 38 1.8
    10 wt%RM 37.5 24.9 33.6 4
    20 wt%RM 21.5 26.7 38.1 2.1 3 8.6
    30 wt%RM 10.1 39 32.7 4.2 4.4 9.6
    40 wt%RM 1.6 33.7 43 0.5 3.9 17.3
    下载: 导出CSV

    表  4  7 d不同赤泥取代率下TSWG中各种矿物相含量(wt%)

    Table  4.   Content of various mineral phases in TSWG under different red mud replacement rates for seven days (wt%)

    Group Mullite Calcite Clinotobermorite Quartz Hematite Calcio
    0 wt%RM 50.5 24.4 19.8 5.3
    10 wt%RM 40 26.4 25.1 4.2 4.3
    20 wt%RM 20.2 27.2 38.2 2.4 7.6 4.4
    30 wt%RM 10.9 27.3 45.4 2.5 2.8 11.1
    40 wt%RM 3.3 30.4 41.8 0.4 3.6 20.5
    下载: 导出CSV

    表  5  原材料的成本和二氧化碳当量E

    Table  5.   Cost of raw materials and E

    MaterialsCost/(CNY·kg−1)E/(kgCO2·kg−1)
    Fly ash0.250.027
    Instant Na2SiO3 powder2.501.530
    Water0.0020.0006
    Red mud0.010.00518
    Slag0.090.143
    下载: 导出CSV

    表  6  TSWG成本效益和环境影响

    Table  6.   Cost effectiveness and environmental impact of TSWG

    Group Compressive strength/MPa ${C}_{\mathrm{p}} $/(CNY·
    MPa−1·m−3)
    $ {E}_{\mathrm{p}} $/(kgCO2·
    MPa−1·m−3)
    0 wt%RM 44.2 11.72 7.24
    10 wt%RM 32.2 15.05 9.84
    20 wt%RM 34.2 13.18 9.18
    30 wt%RM 26.2 15.91 11.86
    40 wt%RM 25.1 15.27 12.26
    Control group 30 16.29 13.54
    Notes: Control group refers to ordinary Portland cement mortar.
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-08-14
  • 修回日期:  2024-09-29
  • 录用日期:  2024-10-09
  • 网络出版日期:  2024-10-26

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