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纳米SiO2复合碳化全再生骨料混凝土力学特性及强化机制

张美香 丁亚红 杨小林 孙博

张美香, 丁亚红, 杨小林, 等. 纳米SiO2复合碳化全再生骨料混凝土力学特性及强化机制[J]. 复合材料学报, 2024, 42(0): 1-10.
引用本文: 张美香, 丁亚红, 杨小林, 等. 纳米SiO2复合碳化全再生骨料混凝土力学特性及强化机制[J]. 复合材料学报, 2024, 42(0): 1-10.
ZHANG Meixiang, DING Yahong, YANG Xiaolin, et al. Mechanical properties and strengthening mechanism of fully recycled aggregate concrete prepared by nano-SiO2 composite carbonated recycled aggregates[J]. Acta Materiae Compositae Sinica.
Citation: ZHANG Meixiang, DING Yahong, YANG Xiaolin, et al. Mechanical properties and strengthening mechanism of fully recycled aggregate concrete prepared by nano-SiO2 composite carbonated recycled aggregates[J]. Acta Materiae Compositae Sinica.

纳米SiO2复合碳化全再生骨料混凝土力学特性及强化机制

基金项目: 国家自然科学基金 (U1904188)
详细信息
    通讯作者:

    丁亚红,博士,教授,博士生导师,研究方向为建筑固废资源化利用、高性能混凝土等 E-mail: dingyahong@hpu.edu.cn

  • 中图分类号: TU528.59

Mechanical properties and strengthening mechanism of fully recycled aggregate concrete prepared by nano-SiO2 composite carbonated recycled aggregates

Funds: National Natural Science Foundation of China (U1904188)
  • 摘要: 为探究碳化改性骨料对全再生骨料混凝土(FRAC)力学特性的影响规律,采用纳米SiO2复合碳化改性再生骨料并制备FRAC,测试了其抗压性能、劈裂抗拉性能及抗折性能等宏观力学特性,采用纳米压痕测试了其微观力学性能,并结合SEM微观测试,揭示了碳化全再生骨料混凝土(CFRAC)多重界面强化机制。结果表明,NS复合碳化实现了再生粗骨料高效碳化改性,CFRAC力学特性均得到显著提高,其中抗压强度、劈裂抗拉强度及抗折强度最大提高幅度分别为33.12%、48.73%及24.53%;CFRAC各相平均弹性模量及显微硬度显著提高,最大提高幅度分别为171.05%、62.96%,其中旧砂浆及骨料-旧砂浆界面过渡区(ITZ1)微观力学性能提高幅度最显著;通过“骨料墙效应”及“ITZ碳化强化效应”揭示了CFRAC强化机制。成果为再生骨料品质提升研究及FRAC推广应用提供理论支撑。

     

  • 图  1  河砂及再生细骨料颗粒级配曲线

    Figure  1.  Particle size distribution curve for sand and recycled fine aggregate

    图  2  碳化前后再生粗骨料酚酞喷涂

    Figure  2.  Phenolphthalein spraying of recycled coarse aggregate before and after carbonation

    图  3  FRAC100与CFRAC100多重界面微观力学测试

    Figure  3.  Micromechanical test of multiple interfaces for FRAC100 and CFRAC100

    图  4  荷载-压痕深度典型曲线

    Figure  4.  Typical curve of load-indentation depth

    Pmax represents the maximum load of the indenter, hf represents the indentation depth after unloading, hc represents the contact depth, hmax represents the maximum indentation depth, S represents the initial slope of the load-indentation depth unloading curve

    图  5  FRAC宏观力学特性

    Figure  5.  Macroscopic mechanical properties of FRAC

    图  6  FRAC荷载-压痕深度曲线

    Figure  6.  Curve of load-indentation depth of FRAC

    图  7  FRAC各相弹性模量(GPa)

    Figure  7.  Each phase elastic modulus of FRAC (GPa)

    图  8  FRAC各相显微硬度(GPa)

    Figure  8.  Each phase microhardness of FRAC (GPa)

    图  9  FRAC ITZ微观形貌SEM图像

    Figure  9.  SEM images of ITZ for FRAC

    图  10  NS复合碳化FRAC强化机制模型

    Figure  10.  Strengthening mechanism model of NS composite carbonated FRAC

    表  1  碳化前后再生骨料物理特性

    Table  1.   Physical properties of recycled aggregate before and after carbonation

    Aggregate type Water absorption/% Crush value/% Apparent density/(kg·m−3)
    Natural aggregate 0.6 8.1 2760
    Sand 0.5 10.2 2591
    Recycled fine aggregate 9.0 25.93 2453
    Carbonated recycled fine aggregate 6.84(↓24%) 23.40(↓9.76%) 2512(↑2.41%)
    Recycled coarse aggregate 4.71 16.2 2648
    Carbonated recycled coarse aggregate 3.63(↓22.93%) 15.60(↓3.70%) 2694(↑1.74%)
    下载: 导出CSV

    表  2  试验方案

    Table  2.   Test scheme

    Series Recycled coarse aggregate
    replacement percentage
    Recycled fine aggregate
    replacement percentage
    Carbonation Number of test
    blocks ( blocks )
    NA 0 0 3
    RC 100% 0、30%、50%、70%、100% No 15
    RF 0、30%、50%、70%、100% 100% No 15
    CRC 100% 0、30%、50%、70%、100% Yes 15
    CRF 0、30%、50%、70%、100% 100% Yes 15
    Notes: NA represents concrete prepared by natural aggregates, RC represents fully recycled coarse aggregate concrete, RF represents fully recycled fine aggregate concrete, CRC represents carbonated fully recycled coarse aggregate concrete, CRF represents carbonated fully recycled fine aggregate concrete.
    下载: 导出CSV

    表  3  全再生骨料混凝土(FRAC)配合比(kg/m3)

    Table  3.   Mix proportion of fully recycled aggregate concrete (FRAC) (kg/m3)

    Series Natural aggregate Recycled coarse aggregate Sand Recycled fine aggregate Water Cement
    NA 1220.36 0 703.38 0.00 167.31 371.80
    RC0 0 579.96 1002.30 0.00 232.68 517.07
    RC30 0 722.70 640.98 260.04 221.14 491.43
    RC50 0 823.16 427.36 404.55 213.02 473.38
    RC70 0 928.20 237.29 524.13 204.53 454.51
    RC100 0 1095.05 0.00 652.91 191.04 424.54
    RF0 1521.78 0.00 0 475.97 98.97 219.93
    RF30 1065.41 445.05 0 475.97 130.81 290.68
    RF50 761.94 742.93 0 482.18 149.82 332.92
    RF70 403.47 918.13 0 554.58 167.30 371.77
    Notes: In RC0, RC represents fully recycled coarse aggregate concrete, and 0 represents the replacement rate of recycled fine aggregate is 0%. In RF0, RF represents fully recycled fine aggregate concrete, and 0 represents the replacement rate of recycled coarse aggregate is 0%.
    下载: 导出CSV
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  • 收稿日期:  2024-04-19
  • 修回日期:  2024-05-10
  • 录用日期:  2024-05-17
  • 网络出版日期:  2024-06-14

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