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风积沙与再生复合微粉对超高性能混凝土力学性能的影响

刘超 林鑫 刘化威 胡天峰

刘超, 林鑫, 刘化威, 等. 风积沙与再生复合微粉对超高性能混凝土力学性能的影响[J]. 复合材料学报, 2021, 39(0): 1-8
引用本文: 刘超, 林鑫, 刘化威, 等. 风积沙与再生复合微粉对超高性能混凝土力学性能的影响[J]. 复合材料学报, 2021, 39(0): 1-8
Chao LIU, Xin LIN, Huawei LIU, Tianfeng HU. Effect of aeolian sand and recycled composite micro-powder on mechanical properties of ultra-high performance concrete[J]. Acta Materiae Compositae Sinica.
Citation: Chao LIU, Xin LIN, Huawei LIU, Tianfeng HU. Effect of aeolian sand and recycled composite micro-powder on mechanical properties of ultra-high performance concrete[J]. Acta Materiae Compositae Sinica.

风积沙与再生复合微粉对超高性能混凝土力学性能的影响

基金项目: 国家自然科学基金(52178251;51878546);陕西省杰出青年科学基金项目(2020JC-46);陕西省重点研发计划项目(2018ZDCXL-SF-03-03-02;2020SF-367);陕西省科技创新基地(2017KTPT-19)
详细信息
    通讯作者:

    刘超,博士,教授,博士生导师,研究方向为建筑固废资源化与智能建造技术 E-mail: chaoliu@xauat.edu.cn

  • 中图分类号: TU528.041

Effect of aeolian sand and recycled composite micro-powder on mechanical properties of ultra-high performance concrete

  • 摘要: 以废弃砖和混凝土制成再生复合微粉部分取代水泥作为辅助胶凝材料,以风积沙部分取代河砂协同制备超高性能混凝土(Ultra-high performance concrete,UHPC),采用修正的Andreasen-Andersen(MAA)颗粒堆积模型设计配合比。建立了考虑风积沙和再生复合微粉火山灰活性的抗压强度增长预测模型。研究了风积沙和复合微粉对UHPC力学性能的影响。结果表明:风积沙等质量取代河砂的取代率为30%、复合微粉等质量取代水泥的取代率为10%时,UHPC力学性能最优。颗粒材料的粒径分布最佳,形成了较高密实度的基体。同时,风积沙和复合微粉活性成分的水化贡献改善了UHPC的微观结构,进而提高其力学性能。

     

  • 图  1  粉体材料的频率分布

    Figure  1.  Frequency distribution of powder materials

    图  2  拟合结果与理论粒径曲线的匹配

    Figure  2.  Curve matching

    图  3  AS和CMP掺量对UHPC工作性能的影响

    Figure  3.  Effect of AS and CMP replacement ratios on UHPC workability

    图  4  AS和CMP掺量对UHPC抗压强度的影响

    Figure  4.  Effect of AS and CMP replacement ratios on the compressive strength of UHPC

    图  5  UHPC细骨料空隙率

    Figure  5.  Fine aggregate void fraction of UHPC

    图  6  AS和CMP掺量对UHPC劈裂抗拉强度的影响

    Figure  6.  Effect of AS and CMP replacement ratios on the splitting tensile strength of UHPC

    图  7  式(1)计算结果与试验结果对比

    Figure  7.  Comparison of Eq. (1) with measured results

    图  8  VFP和CMP参与水化反应过程

    Figure  8.  VFP and CMP participate in the hydration reaction process

    图  9  不同风积沙和复合微粉取代率下UHPC的XRD图谱

    Figure  9.  XRD patterns of UHPC with different substitution rates of AS and CMP

    图  10  风积沙和复合微粉取代率对UHPC微观结构的影响:

    Figure  10.  Effect of AS and CMP substitution rate on microstructure of UHPC: (a)-(b) is CMP0AS0; (c)-(d) is CMP10AS30; (e)-(f) is CMP20AS45

    表  1  UHPC配合比

    Table  1.   Mix proportions of UHPC

    CodeMixBinder compositions/(kg·m−3)Water/
    (kg·m−3)
    Superplasticizer/
    (kg·m−3)
    Steel
    fiber/%
    River sand /
    (kg·m−3)
    Aeolian sand /
    (kg·m−3)
    CementBrick powderConcrete powderSilica FumeUltrafine Fly Ash
    1CMP0AS0595008517013621.252.58500
    2CMP10AS05105134851708500
    3CMP20AS042510268851708500
    4CMP0AS155950085170722.5127.5
    5CMP10AS15510513485170722.5127.5
    6CMP20AS154251026885170722.5127.5
    7CMP0AS305950085170590225
    8CMP10AS30510513485170590225
    9CMP20AS304251026885170590225
    10CMP0AS455950085170467.5382.5
    11CMP10AS45510513485170467.5382.5
    12CMP20AS454251026885170467.5382.5
    下载: 导出CSV

    表  2  不同UHPC试件的风积沙与水泥掺量比值(S/C)和复合微粉掺量与胶凝材料总量比值(Cc/C0)

    Table  2.   The ratio of aeolian sand content to cement content (S/C) and composite micro-powder content to total cementitious material (Cc/C0) values of different UHPC specimens

    Code123456789101112
    S/C0000.210.250.30.380.440.530.630.750.9
    Cc/C000.10.200.10.200.10.200.10.2
    下载: 导出CSV
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  • 收稿日期:  2021-09-28
  • 录用日期:  2021-11-16
  • 修回日期:  2021-11-02
  • 网络出版日期:  2021-12-07

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