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基于秸秆固废资源化的水泥辅助胶凝材料制备与性能

商效瑀 史华彤 龚彬 陈钰琦

商效瑀, 史华彤, 龚彬, 等. 基于秸秆固废资源化的水泥辅助胶凝材料制备与性能[J]. 复合材料学报, 2024, 42(0): 1-13.
引用本文: 商效瑀, 史华彤, 龚彬, 等. 基于秸秆固废资源化的水泥辅助胶凝材料制备与性能[J]. 复合材料学报, 2024, 42(0): 1-13.
SHANG Xiaoyu, SHI Huatong, GONG Bin, et al. Preparation and properties of supplementary cementing materials based on recycling of straw solid wastes[J]. Acta Materiae Compositae Sinica.
Citation: SHANG Xiaoyu, SHI Huatong, GONG Bin, et al. Preparation and properties of supplementary cementing materials based on recycling of straw solid wastes[J]. Acta Materiae Compositae Sinica.

基于秸秆固废资源化的水泥辅助胶凝材料制备与性能

基金项目: 国家自然科学基金项目(51708091)吉林省教育厅重大科技项目(JJKH20240155KJ)
详细信息
    通讯作者:

    商效瑀,博士,副教授,硕士生导师,研究方向为绿色及先进混凝土材料 、绿色建筑技术与理论、建筑固体废弃物科学E-mail:shangxiaoyu@neepu.edu.cn

  • 中图分类号: TU526;TB332

Preparation and properties of supplementary cementing materials based on recycling of straw solid wastes

Funds: National Natural Science Foundation of China (No. 51708091); The Education Department of Jilin Province major science and technology projects (JJKH20240155KJ)
  • 摘要: 针对双碳目标下水泥及其复材降低碳排放问题,本研究以玉米秸秆固废 (Corn straw waste, CSW) 为原料,发展预处理-热解-研磨三步工艺,制备一种可作为水泥辅助胶凝材料的可持续生物质灰材料。重点研究了预处理方式(未处理,蒸馏水洗涤,盐酸洗涤)、热解温度(500 ℃、600 ℃、700 ℃)和热解时间(1 h、2 h、3 h)对CSA性能的影响,以及不同预处理类型和玉米秸秆灰(Corn straw ash, CSA)掺量对水泥砂浆性能的影响。实验结果表明,随着热解温度的升高和热解时间的增长,CSA中SiO2含量逐渐增加,且热解温度对SiO2结晶的影响远大于热解时间的影响。掺入量为5 wt%的CSA可使砂浆抗压强度提高11.7%。当CSA掺入量超过5 wt%时,过多的多孔结构导致抗压强度降低。未处理、水洗和酸洗CSA的复掺,依次引发水泥基体内C-S-H形貌从蜂窝状、纤维状转变为致密的凝胶状,CSW经酸洗预处理、600 ℃下热解2 h制备的CSA具有优异的火山灰活性,可作为良好的水泥辅助胶凝材料。

     

  • 图  1  水泥的粒径分布

    Figure  1.  Particle Size distribution of Cement

    图  2  CSA的制备过程

    Figure  2.  Production process of CSA

    图  3  CSW的热重分析

    Figure  3.  Thermogravimetric analysis of CSW

    图  4  CSA的X射线衍射

    Figure  4.  XRD of CSA

    图  5  CSA的粒径分布

    Figure  5.  Particle size distribution of CSA

    图  6  不同CSA水泥浆样品的等温量热

    Figure  6.  Isothermal calorimetry of cement pastes samples containing different CSA

    图  7  砂浆的流动度

    Figure  7.  Flowability of mortars

    图  8  砂浆的力学性能

    Figure  8.  Mechanical properties of mortars

    图  9  混合水泥浆体的SEM图像(5000×)(a) OPM;(b) M5-A;(c) M10-A;(d) M5-U;(e) M5-W

    Figure  9.  SEM images of blended cement pastes (5000×) (a) OPM;(b) M5-A;(c) M10-A;(d) M5-U;(e) M5-W

    表  1  水泥的化学成分

    Table  1.   Chemical composition of cement

    wt%SiO2CaOAl2O3Fe2O3MgOSO3TiO2K2ONa2OLOI
    Cement20.2562.306.043.412.013.650.390.840.173.24
    下载: 导出CSV

    表  2  玉米秸秆灰(CSA)样品的制备条件

    Table  2.   The preparation conditions of corn straw ash (CSA) samples

    Sample codeWashing methodPyrolysis temperatureHeating ratePyrolysis durationGrinding time
    A1500℃2 h
    A2500℃3 h
    A3600℃1 h
    A4-U, -W, -A600℃10℃/min2 h30 min
    A5600℃3 h
    A6700℃1 h
    A7700℃2 h
    Notes: -U means unwashed. -W means pure water washed. -A means acid-washed.
    下载: 导出CSV

    表  3  砂浆的配合比

    Table  3.   Mix-proportion details of mortars

    Series Cementing materials/wt. % water/binder ratio SP/wt. % Sand/binder ratio
    Cement CSA
    OPM 100 3
    M3-A 97 3 0.5 0.15 3
    M5-A 95 5 0.5 0.15 3
    M10-A 90 10 0.5 0.15 3
    M5-U 95 5 0.5 0.15 3
    M5-W 95 5 0.5 0.15 3
    Notes:OPM means Ordinary Portland mortar. SP means superplasticizer.
    下载: 导出CSV

    表  4  不同洗涤方式下CSA的化学组成及烧失量(LOI,Loss on ignition)

    Table  4.   Chemical composition and loss on ignition of CSA under different washing methods

    wt% A5-U A5-W A5-A A6-U A6-W A6-A
    SiO2 24.386 66.748 75.653 23.109 68.675 76.749
    Al2O3 0.980 0.919 0.909 0.981 0.985 0.927
    Fe2O3 0.954 1.868 1.251 0.713 1.435 0.977
    CaO 7.440 20.479 13.914 9.130 19.152 13.235
    K2O 36.794 0.962 0.934 35.747 1.172 1.097
    MgO 7.337 4.805 2.863 8.593 4.652 2.678
    Na2O 2.767 0.011 0.032 2.391 0.085 0.013
    P2O5 6.959 1.202 1.712 6.439 1.236 1.548
    ZnO 0.057 0.199 0.080 0.075 0.135 0.048
    SO3 0.951 2.386 2.011 1.162 1.936 2.291
    Cl 10.977 0.273 0.480 11.234 0.360 0.187
    Others 0.398 0.148 0.161 0.426 0.177 0.250
    LOI 4.65 2.94 2.39 4.39 2.93 2.24
    下载: 导出CSV

    表  5  不同热解条件下CSA的氧化物组成及LOI

    Table  5.   Oxide composition and loss on ignition of CSA under different pyrolysis conditions

    wt% A1-A A3-A A4-A A5-U A7-A
    SiO2 67.458 71.519 73.644 75.653 77.495
    Al2O3 1.028 0.944 0.858 0.909 0.803
    Fe2O3 0.889 1.713 1.674 1.251 1.272
    CaO 15.380 15.676 14.302 13.914 12.385
    K2O 2.805 1.756 1.178 0.934 1.091
    MgO 6.708 3.516 3.967 2.863 2.699
    Na2O 0.092 0.044 0.054 0.032 0.035
    P2O5 1.781 1.222 1.409 1.712 1.532
    ZnO 0.259 0.151 0.147 0.080 0.126
    SO3 2.385 2.929 2.253 2.011 2.096
    Cl 0.892 0.293 0.313 0.380 0.251
    Others 0.323 0.237 0.201 0.261 0.215
    LOI 2.82 2.79 2.66 2.39 2.21
    下载: 导出CSV
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  • 收稿日期:  2024-04-09
  • 修回日期:  2024-05-07
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