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偏高岭土-矿渣地聚物宏观性能试验及Lasso回归模型

钟卿瑜 粟淼 彭晖

钟卿瑜, 粟淼, 彭晖. 偏高岭土-矿渣地聚物宏观性能试验及Lasso回归模型[J]. 复合材料学报, 2022, 39(11): 5474-5485. doi: 10.13801/j.cnki.fhclxb.20211230.001
引用本文: 钟卿瑜, 粟淼, 彭晖. 偏高岭土-矿渣地聚物宏观性能试验及Lasso回归模型[J]. 复合材料学报, 2022, 39(11): 5474-5485. doi: 10.13801/j.cnki.fhclxb.20211230.001
ZHONG Qingyu, SU Miao, PENG Hui. Experiment and Lasso regression model of the macroscopic performance of metakaolin-slag geopolymer paste[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5474-5485. doi: 10.13801/j.cnki.fhclxb.20211230.001
Citation: ZHONG Qingyu, SU Miao, PENG Hui. Experiment and Lasso regression model of the macroscopic performance of metakaolin-slag geopolymer paste[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5474-5485. doi: 10.13801/j.cnki.fhclxb.20211230.001

偏高岭土-矿渣地聚物宏观性能试验及Lasso回归模型

doi: 10.13801/j.cnki.fhclxb.20211230.001
基金项目: 国家自然科学基金(51878068);湖南省研究生科研创新项目(CX2019653)
详细信息
    通讯作者:

    彭晖,博士,教授,博士生导师,研究方向为地聚物的合成及结构工程应用 E-mail:huipeng@csust.edu.cn

  • 中图分类号: TU52

Experiment and Lasso regression model of the macroscopic performance of metakaolin-slag geopolymer paste

  • 摘要: 设计120组偏高岭土-矿渣地聚物净浆试验,探讨了碱激发剂浓度、模数、液固比这三个变量对地聚物净浆抗压强度、流动度和凝结时间的影响规律。基于获得的试验数据,建立Lasso多元回归模型预测了偏高岭土-矿渣地聚物净浆7天和28天抗压强度、流动度、初凝及终凝时间。试验结果表明:(1) 抗压强度随碱激发剂浓度的增大而提高,随液固比增大而降低,随模数的增大先提高后降低;(2) 液固比增大,凝结时间延长;而模数和浓度对凝结时间的影响由碱激发剂的硅含量和碱含量决定;(3) 流动度主要与碱激发剂的黏稠程度和液固比有关。模型验证结果表明:采用Lasso算法对回归模型进行正则化,避免了回归系数过大而导致的过拟合现象,提出的回归模型能准确预测偏高岭土-矿渣地聚物净浆各项宏观性能,测试集数据中的预测值与试验值的相关性系数均大于0.92。

     

  • 图  1  MK和GGBFS的XRD图谱

    Figure  1.  XRD patterns of MK and GGBFS

    图  2  液固比为1.3时模数对偏高岭土-矿渣地聚物净浆抗压强度的影响

    Figure  2.  Effect of the modulus on the compressive strength of metakaolin-slag geopolymer pastes with liquid-to-solid ratio of 1.3

    C—Concentration

    图  3  模数为1.2时浓度和液固比对偏高岭土-矿渣地聚物净浆抗压强度的影响

    Figure  3.  Effect of the concentration and the liquid-solid ratio on the compressive strength of metakaolin-slag geopolymer pastes with modulus of 1.2

    图  4  液固比为0.9时浓度和模数对偏高岭土-矿渣地聚物净浆流动度的影响

    Figure  4.  Effect of concentration and modulus on fluidity of metakaolin-slag geopolymer slurries with liquid-to-solid ratio of 0.9

    图  5  碱激发剂参数对碱激发剂黏度的影响

    Figure  5.  Influence of parameters of alkaline activator on viscosity of alkaline activator

    M—Modulus

    图  6  模数为1.4时液固比对偏高岭土-矿渣地聚物净浆流动度的影响

    Figure  6.  Effect of the liquid-solid ratio on fluidity of metakaolin-slag geopolymer slurries with modulus of 1.4

    图  7  液固比为1.5时浓度对偏高岭土-矿渣地聚物净浆凝结时间的影响

    m(Na2O)/m(GGBFS+MK)—Alkali content in the geopolymer paste

    Figure  7.  Effect of the concentration on setting times of metakaolin-slag geopolymer slurries with liquid-to-solid ratio of 1.5

    图  9  浓度为0.31时模数和液固比对偏高岭土-矿渣地聚物净浆凝结时间的影响

    Figure  9.  Effect of the modulus and the liquid-solid ratio on setting times of metakaolin-slag geopolymer slurries with concentration of 0.31

    图  8  模数为1.4和液固比为1.5时不同浓度下偏高岭土-矿渣地聚物净浆的反应放热速率曲线

    Figure  8.  Reaction exothermic rate curves of metakaolin-slag geopolymer pastes with different concentration when the modulus is 1.4 and the liquid-solid ratio is 1.5

    图  10  浓度为0.31和液固比为1.1时不同模数下偏高岭土-矿渣地聚物净浆的反应放热速率曲线

    Figure  10.  Reaction exothermic rate curves of metakaolin-slag geopolymer pastes with different modulus when the concentration is 0.31 and the liquid-solid ratio is 1.1

    图  11  浓度为0.31和模数为1.4时不同液固比L/S下偏高岭土-矿渣地聚物净浆反应放热速率曲线

    Figure  11.  Reaction exothermic rate curves of metakaolin-slag geopolymer pastes with different liquid-solid ratio L/S when the concentration is 0.31 and the modulus is 1.4

    图  12  偏高岭土-矿渣地聚物净浆7天抗压强度的试验值和预测值

    Figure  12.  Predicted results versus experimental results for the 7 days compressive strength of metakaolin-slag geopolymer pastes

    图  13  偏高岭土-矿渣地聚物净浆28天抗压强度的试验值和预测值

    Figure  13.  Predicted results versus experimental results for the 28 days compressive strength of metakaolin-slag geopolymer pastes

    图  14  偏高岭土-矿渣地聚物净浆流动度的试验值和预测值

    Figure  14.  Predicted results versus experimental results for the fluidity of metakaolin-slag geopolymer pastes

    图  15  偏高岭土-矿渣地聚物净浆初凝时间的试验值和预测值

    Figure  15.  Predicted results versus experimental results for the initial setting time of metakaolin-slag geopolymer pastes

    图  16  偏高岭土-矿渣地聚物净浆终凝时间的试验值和预测值

    Figure  16.  Predicted results versus experimental results for the final setting time of metakaolin-slag geopolymer pastes

    表  1  偏高岭土(MK)和粒化高炉矿渣(GGBFS)的粒度指标

    Table  1.   Particle size index of metakaolin (MK) and ground granulated blast furnace slag (GGBFS)

    MaterialD10/μmD50/μmD90/μm
    MK0.5160.8193.742
    GGBFS1.3894.44710.554
    Note: D10, D50, D90—10%, 50%, 90% cumulative particle size distribution.
    下载: 导出CSV

    表  2  MK和GGBFS的化学组成

    Table  2.   Chemical composition of MK and GGBFS

    Mass fraction of chemical
    composition/wt%
    MKGGBFS
    SiO252.5330.23
    Al2O345.4213.72
    CaO0.2644.06
    MgO5.58
    SO30.043.16
    TiO20.971.79
    K2O0.180.50
    Fe2O30.41
    Others0.600.55
    下载: 导出CSV

    表  3  偏高岭土-矿渣地聚物强度和工作性能影响因素及水平

    Table  3.   Influencing factors and levels of compressive strength and working performance of metakaolin-slag geopolymer pastes

    FactorsLevels
    Concentration C0.23, 0.27, 0.31, 0.350.39
    Modulus M1.0, 1.2, 1.4, 1.6, 1.81.0, 1.2, 1.4, 1.6
    Liquid-to-solid ratio0.9, 1.1, 1.3, 1.5, 1.70.9, 1.1, 1.3, 1.5, 1.7
    下载: 导出CSV

    表  4  数据集中各变量的统计指标值

    Table  4.   Statistical measurements of the variables in the dataset

    Variablex1x2x3σ7d/MPaσ28d/MPaf/mmTi/minTf/min
    Minimum0.231.000.909.9011.4988.0059.0065.00
    Maximum0.391.801.7075.4076.40300.00337.00340.00
    Mean0.311.401.3033.6638.92193.80143.45149.88
    Standard deviation0.060.290.2816.3016.2253.3968.1568.26
    Notes: x1—Concentration of alkaline activator; x2—Modulus of alkaline activator; x3—Liquid-solid ratio of alkaline activator; σ7d and σ28d—7 days compressive strength and 28 days compressive strength of metakaolin-slag geopolymer pastes; f—Fluidity of metakaolin-slag geopolymer pastes; Ti and Tf—Initial setting time and final setting time of metakaolin-slag geopolymer pastes.
    下载: 导出CSV

    表  5  偏高岭土-矿渣地聚物净浆预测值与试验值的相关系数

    Table  5.   Correlation coefficients between predicted values and experimental values of metakaolin-slag geopolymer pastes

    Macroscopic propertiesCorrelation coefficients (COD)
    Training
    procedure
    Test
    procedure
    Compressive strength (7 days)0.9800.946
    Compressive strength (28 days)0.9400.929
    Fluidity0.9840.989
    Initial setting time0.9430.926
    Final setting time0.9430.926
    下载: 导出CSV
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  • 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:  2021-12-30
  • 刊出日期:  2022-11-01

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