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纳米SiO2对硫铝酸盐混凝土负温力学性能与微观结构的影响

李恒 王正君 杜英欣

李恒, 王正君, 杜英欣. 纳米SiO2对硫铝酸盐混凝土负温力学性能与微观结构的影响[J]. 复合材料学报, 2024, 42(0): 1-11.
引用本文: 李恒, 王正君, 杜英欣. 纳米SiO2对硫铝酸盐混凝土负温力学性能与微观结构的影响[J]. 复合材料学报, 2024, 42(0): 1-11.
LI Heng, WANG Zhengjun, DU Yingxin. Effect of nano-SiO2 on negative temperature mechanical properties and microstructure of sulfoaluminate concrete[J]. Acta Materiae Compositae Sinica.
Citation: LI Heng, WANG Zhengjun, DU Yingxin. Effect of nano-SiO2 on negative temperature mechanical properties and microstructure of sulfoaluminate concrete[J]. Acta Materiae Compositae Sinica.

纳米SiO2对硫铝酸盐混凝土负温力学性能与微观结构的影响

基金项目: 黑龙江省重点研发计划指导类科研项目(GZ20220138);黑龙江省生态环境厅科研项目(HST2022GF004)
详细信息
    通讯作者:

    王正君,博士,教授,硕士生导师,研究方向为水工混凝土材料 E-mail:1995073@hlju.edu.cn

  • 中图分类号: TU528.3

Effect of nano-SiO2 on negative temperature mechanical properties and microstructure of sulfoaluminate concrete

Funds: Scientific research projects under the guidance category of the Heilongjiang Provincial Key R&D Programme (GZ20220138); Scientific research projects of the Heilongjiang Provincial Department of Ecology and Environment (HST2022GF004)
  • 摘要: 为保证混凝土在负温环境下的安全可靠,采用力学性能测试、超声波波速测试、扫描电子显微镜(SEM)、X射线衍射(XRD)结合Rietveld精修定量分析等方法,研究了恒负温(−10℃)养护条件下不同纳米SiO2(NS)掺量对硫铝酸盐混凝土性能的影响。结果表明:硫铝酸盐混凝土强度随NS掺量的增加,先升高后降低,在2%NS掺量时强度达到最大;当养护温度从负温变为常温时,超声波波速先降低后升高,掺入NS后再次水化(升高段)的超声波波速上升速率均高于空白组,其中2%NS掺量的混凝土超声波波速上升速率最快;SEM和XRD发现随NS掺量增加,混凝土内部孔隙结构变的更加致密,钙矾石(AFt)相对含量逐渐上升,其中2%NS掺量AFt含量最高,说明NS可以促进负温环境下的硫铝酸盐混凝土的水化。

     

  • 图  1  纳米SiO2(NS)颗粒(a)及SEM图像(b)

    Figure  1.  Nano-SiO2 (NS) particles (a) and SEM images (b)

    图  2  硫铝酸盐水泥、NS的粒度分布曲线

    Figure  2.  Particle size distribution curve of sulfoaluminate cement and NS

    图  3  试块制备过程及测试

    Figure  3.  Specimen preparation process and testing

    图  4  NS掺量对硫铝酸盐混凝土抗压强度的影响

    Figure  4.  Effect of NS admixture on compressive strength of sulfo-aluminate concrete

    图  5  NS促进早期硫铝酸盐水泥水化过程

    Figure  5.  NS promotes the hydration process of early sulfoaluminate cements

    图  6  超声波传播路径示意图

    Figure  6.  Diagram of ultrasonic propagation path

    图  7  硫铝酸盐混凝土升温过程中超声波速度的变化

    Figure  7.  Variation of ultrasonic velocity during warming of sulfoaluminate concrete

    图  8  不同NS掺量混凝土抗压强度与超声波波速的关系

    Figure  8.  Relationship between compressive strength of concrete with different NS admixture and ultrasonic wave velocity

    图  9  不同NS掺量1 d龄期的微观结构:(a)空白组;(b)1%NS掺量;(c)2%NS掺量

    Figure  9.  Microstructure at 1 d age with different NS doping: (a)0%NS; (b)1%NS; (c)2%NS

    图  10  不同NS掺量3 d龄期的微观结构:(a)空白组;(b)1%NS掺量;(c)2%NS掺量

    Figure  10.  Microstructure at 3 d age with different NS doping: (a)0%;(b)1%; (c)2%

    图  11  1、3 d龄期硫铝酸盐水泥的XRD图谱

    Figure  11.  XRD patterns of sulphoaluminate cement at 1 and 3 d ages

    表  1  硫铝酸盐水泥的技术指标

    Table  1.   Technical specifications for sulphoaluminate cements

    Specific surface
    area/(m2·kg−1)
    Setting time/min Compressive strength/MPa Flexural strength/MPa
    Initial setting Final setting 1 d 3 d 28 d 1 d 3 d 28 d
    368 26 68 36.1 44.3 49.4 6.2 7.2 8.4
    下载: 导出CSV

    表  2  NS的物理性能

    Table  2.   Physical properties of NS

    Appearance Average Primary size/nm Apparent density/(g·cm−3) Specific surface area/(m2·g−1) Loss on dry/%
    White powder 21 0.19 198 4.7
    下载: 导出CSV

    表  3  硫铝酸盐水泥和NS的主要化学成分

    Table  3.   Main chemical composition of sulphoaluminate cement and NS

    Material Mass fraction/ %
    SiO2 Al2O3 CaO Fe2O3 MgO SO3 K2O Na2O
    Sulfoaluminate
    cement
    7.58 30.53 45.38 3.52 2.25 14.37 0.30 0.76
    NS 99.98 0.001 0.015 0.004
    下载: 导出CSV

    表  4  硫铝酸盐混凝土配合比(kg/m3)

    Table  4.   Sulfoaluminate concrete ratio (kg/m3)

    Groupsw/cNS/%Li2CO3/%CementWaterAggregateFine aggregate
    NS-00.4500.2433.31951151.6620.1
    NS-10.4510.24291951151.6620.1
    NS-1.50.451.50.2426.81951151.6620.1
    NS-20.4520.2424.61951151.6620.1
    NS-30.4530.2420.31951151.6620.1
    Note: w/c is the water cement ratio of concrete.
    下载: 导出CSV

    表  5  回归分析计算误差(%)

    Table  5.   Calculation error of regression analysis (%)

    GroupsLinear functionLogarithmic functionPower function
    Average relative errorRSDAverage relative errorRSDAverage relative errorRSD
    NS-01.562.040.831.050.740.96
    NS-12.593.342.493.193.184.12
    NS-1.53.835.093.524.645.316.77
    NS-24.345.323.564.785.076.83
    NS-36.679.343.934.806.227.57
    Note: RSD refers to relative standard deviation.
    下载: 导出CSV

    表  6  硫铝酸盐水泥水化产物晶体结构参数

    Table  6.   Crystal structure parameters of hydration products of sulfoaluminate cement

    Mineral a b c α/(º) β/(º) γ/(º) V3 ICSD
    Ettringite 9.189 9.189 9.189 90 90 90 779.958 9560
    Ye'elimite 11.223 11.223 21.428 90 90 120 2358.532 16045
    Anhydite 6.984 6.241 6.986 90 90 90 306.180 16382
    Belite 5.496 6.756 10.433 90 116.758 90 343.916 963
    Quartz 4.907 4.907 5.408 90 90 120 112.876 62405
    下载: 导出CSV

    表  7  不同NS掺量硫铝酸盐水泥水化1 d、3 d时的矿物含量

    Table  7.   Mineral content of sulfoaluminate cement hydrated at 1 d and 3 d with different NS dosage

    Groups Relative amount/% Rwp
    Hydration age Ettringite Ye'elimite Anhydite Belite Quartz
    NS-0 1 d 26.23 36.38 14.42 21.13 1.84 8.81
    3 d 28.66 35.11 13.12 21.02 2.09 9.23
    NS-1 1 d 27.77 34.64 13.88 20.86 2.85 9.67
    3 d 31.86 31.24 12.45 20.34 4.11 8.63
    NS-1.5 1 d 29.63 33.32 12.65 20.64 3.76 8.82
    3 d 32.98 29.93 12.05 20.22 4.82 9.87
    NS-2 1 d 31.82 31.23 12.28 20.41 4.26 9.56
    3 d 33.74 28.44 11.87 20.11 5.84 8.97
    下载: 导出CSV
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  • 收稿日期:  2024-04-10
  • 修回日期:  2024-05-29
  • 录用日期:  2024-06-11
  • 网络出版日期:  2024-06-26

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