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青稞秸秆灰-氯氧镁水泥复合材料盐冻耦合损伤强度特性及孔隙特征

曹锋 乔宏霞 李双营 赵紫岩 舒修远 崔丽君

曹锋, 乔宏霞, 李双营, 等. 青稞秸秆灰-氯氧镁水泥复合材料盐冻耦合损伤强度特性及孔隙特征[J]. 复合材料学报, 2023, 40(5): 2972-2987. doi: 10.13801/j.cnki.fhclxb.20220629.003
引用本文: 曹锋, 乔宏霞, 李双营, 等. 青稞秸秆灰-氯氧镁水泥复合材料盐冻耦合损伤强度特性及孔隙特征[J]. 复合材料学报, 2023, 40(5): 2972-2987. doi: 10.13801/j.cnki.fhclxb.20220629.003
CAO Feng, QIAO Hongxia, LI Shuangying, et al. Strength and pore characteristics of highland barley straw ash-magnesium oxychloride cement composite under salt freezing coupling damage[J]. Acta Materiae Compositae Sinica, 2023, 40(5): 2972-2987. doi: 10.13801/j.cnki.fhclxb.20220629.003
Citation: CAO Feng, QIAO Hongxia, LI Shuangying, et al. Strength and pore characteristics of highland barley straw ash-magnesium oxychloride cement composite under salt freezing coupling damage[J]. Acta Materiae Compositae Sinica, 2023, 40(5): 2972-2987. doi: 10.13801/j.cnki.fhclxb.20220629.003

青稞秸秆灰-氯氧镁水泥复合材料盐冻耦合损伤强度特性及孔隙特征

doi: 10.13801/j.cnki.fhclxb.20220629.003
基金项目: 国家自然科学基金(51868044);青海省基础研究计划项目(2022-ZJ-921)
详细信息
    通讯作者:

    乔宏霞,博士,教授,研究方向为氯氧镁水泥的性能调控 E-mail: qhxlut7706@163.com

  • 中图分类号: TU528;TB332

Strength and pore characteristics of highland barley straw ash-magnesium oxychloride cement composite under salt freezing coupling damage

Funds: National Natural Science Foundation of China (51868044); Basic Research Program of Qinghai Province (2022-ZJ-921)
  • 摘要: 为探究掺入青稞秸秆灰(HBSA)对氯氧镁水泥(MOC)的耐久性能与孔隙结构的影响,采用HBSA来改善MOC的耐久性能,制备青稞秸秆灰-氯氧镁水泥复合材料。对不同HBSA掺量的氯氧镁水泥砂浆(MOCM)分别在盐湖卤水侵蚀、冻融循环侵蚀及盐冻耦合侵蚀条件下的耐久性能进行研究,采用相对质量评价参数、相对动弹性模量评价参数及相对抗压强度评价参数3种耐久性评价指标来反映MOCM的耐久性能劣化规律,并确定HBSA的最佳掺量。通过表观形貌分析及孔隙结构测试,揭示不同侵蚀环境下MOCM的耐久性损伤劣化程度及孔隙结构特征。结果表明:冻融循环侵蚀对MOCM造成的耐久性损伤程度比盐卤侵蚀及盐冻耦合侵蚀更严重,MOCM试件表面产生了更多的宏观裂缝。HBSA掺入能够显著改善MOCM的耐久性能。当HBSA掺量为10wt%时,MOCM在盐湖卤水侵蚀、冻融循环侵蚀及盐冻耦合侵蚀条件下的耐久性能分别比未掺HBSA时提高了21.24%、23.48%和18.91%。掺入10wt%HBSA的MOCM的开口孔隙率减小,比表面积增大,最可几孔径和平均孔径减小,细化了MOCM的孔隙结构,提高了耐久性能。

     

  • 图  1  青稞秸秆灰(HBSA)的制备与表征:(a) 制备工艺;(b) SEM图像;(c) XRD图谱;(d) 粒径分布

    Figure  1.  Preparation and characterization of highland barley straw ash (HBSA): (a) Preparation process; (b) SEM image; (c) XRD pattern; (d) Particle size distribution

    图  2  盐卤侵蚀环境HBSA-MOCM的耐久性评价参数

    Figure  2.  Durability evaluation parameters of HBSA-MOCM in salt lake brine erosion environment

    图  3  冻融循环侵蚀环境HBSA-MOCM的耐久性评价参数

    Figure  3.  Durability evaluation parameters of HBSA-MOCM in freeze-thaw cycle erosion environment

    图  4  盐冻耦合侵蚀环境HBSA-MOCM的耐久性评价参数

    Figure  4.  Durability evaluation parameters of HBSA-MOCM in salt-frozen coupling erosion environment

    图  5  不同侵蚀条件下HBSA-MOCM的表观形貌

    Figure  5.  Apparent morphologies of HBSA-MOCM under different erosion conditions

    图  6  不同HBSA掺量的MOCM的开口孔隙率

    Figure  6.  Opening porosities of MOCM with different HBSA contents

    图  7  HBSA-MOCM的吸脱附曲线

    Figure  7.  Adsorption-desorption curves of HBSA-MOCM

    图  8  HBSA-MOCM的比表面积拟合关系

    Q—Gas adsorption capacity; p0—Saturation pressure of the gas; p—Gas pressure in equilibrium with the sample

    Figure  8.  Fitting relationships of specific surface area of HBSA-MOCM

    图  9  HBSA-MOCM的较小孔径分布(≤10 nm)

    dV/dD—Differential of pore volume

    Figure  9.  Smaller pore diameter distribution of HBSA-MOCM (≤10 nm)

    图  10  HBSA-MOCM的较大孔径分布(>10 nm)

    Figure  10.  Larger pore diameter distribution of HBSA-MOCM (>10 nm)

    图  11  HBSA-MOCM的累计孔隙体积和累积孔隙表面积

    Figure  11.  Cumulative pore volume and cumulative pore surface area of HBSA-MOCM

    图  12  HBSA-MOCM的SEM图像

    Figure  12.  SEM images of HBSA-MOCM

    表  1  HBSA的化学成分

    Table  1.   Chemical compositions of HBSA wt%

    SiO2CaOSO3MgOAl2O3Fe2O3K2ONa2OP2O5Others
    61.7510.631.752.045.923.835.312.605.720.44
    下载: 导出CSV

    表  2  HBSA-氯氧镁水泥砂浆(MOCM)的配合比

    Table  2.   Mix ratios of HBSA-magnesium oxychloride cement mortar (MOCM) (kg/m3)

    MgOMgCl2SandSuperplasticizerWater repellentWaterHBSA
    583.4 221.7 937.5 16.0 6.9 203.4 0
    211.7 29.2
    220.0 58.3
    228.4 87.5
    236.7 116.7
    253.2 175.0
    下载: 导出CSV

    表  3  HBSA-MOCM试件的编号

    Table  3.   Specimen number of HBSA-MOCM

    Specimen numberCycleHBSA/wt%Specimen numberCycleHBSA/wt%
    0%HBSA-MOCM(N0) 0010%HBSA-MOCM(N0)
    010
    0%HBSA-MOCM(S60)60010%HBSA-MOCM(S60)6010
    0%HBSA-MOCM(F60)60010%HBSA-MOCM(F60)6010
    0%HBSA-MOCM(SF60)60010%HBSA-MOCM(SF60)6010
    Notes: N stands for the specimen without erosion; S represents the specimen eroded by salt lake brine; F represents the specimen eroded by freeze-thaw cycle; SF represents the specimen eroded by salt-frozen coupling.
    下载: 导出CSV

    表  4  盐湖卤水的主要离子浓度 (g/L)

    Table  4.   Concentration of main ions in salt lake brine (g/L)

    K++Na+Ca2+Mg2+ClSO42−HCO3TDSpH
    83.2552.7852.71128.22137.600.12457.687.60
    Note: TDS—Total soluble solid content in salt lake brine.
    下载: 导出CSV

    表  5  HBSA-MOCM的比表面积计算结果

    Table  5.   Calculation results of specific surface area of HBSA-MOCM

    Specimen numberVm/(cm3·g−1)CSSA/(m2·g−1)Specimen numberVm/(cm3·g−1)CSSA/(m2·g−1)
    0%HBSA-MOCM(N0) 2.04 86.60 8.88 10%HBSA-MOCM(N0) 2.97 95.34 12.93
    0%HBSA-MOCM(S60) 1.24 66.19 5.40 10%HBSA-MOCM(S60) 1.80 159.03 7.41
    0%HBSA-MOCM(F60) 0.21 66.44 0.92 10%HBSA-MOCM(F60) 0.86 48.25 3.73
    0%HBSA-MOCM(SF60) 0.53 71.57 2.33 10%HBSA-MOCM(SF60) 0.97 227.62 4.23
    Notes: Vm—Amount of gas required to complete monolayer adsorption on the surface; C—Constant; SSA—Specific surface area.
    下载: 导出CSV

    表  6  HBSA-MOCM试件的各类孔径测试结果

    Table  6.   Test results of various pore diameters of HBSA-MOCM specimens nm

    Specimen numberdadbdmdwSpecimen numberdadbdmdw
    0%HBSA-MOCM(N0)3.1316.2112.540.72410%HBSA-MOCM(N0)3.0615.5710.860.722
    0%HBSA-MOCM(S60)3.5217.7815.550.73010%HBSA-MOCM(S60)3.3316.6611.230.725
    0%HBSA-MOCM(F60)6.3127.5721.920.74910%HBSA-MOCM(F60)6.1222.6913.720.737
    0%HBSA-MOCM(SF60)3.9621.9517.940.73810%HBSA-MOCM(SF60)3.8820.7912.950.732
    Notes: da—Most probable pore diameter (≤10 nm); db—Most probable pore diameter (>10 nm); dm—Average pore diameter; dw—Average pore width.
    下载: 导出CSV
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  • 收稿日期:  2022-05-18
  • 修回日期:  2022-06-10
  • 录用日期:  2022-06-15
  • 网络出版日期:  2022-06-30
  • 刊出日期:  2023-05-15

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