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人工冷粘结轻骨料高强混凝土制备及性能

商效瑀 黄文逸 方泽宇 陈钰琦 张斌

商效瑀, 黄文逸, 方泽宇, 等. 人工冷粘结轻骨料高强混凝土制备及性能[J]. 复合材料学报, 2024, 42(0): 1-11.
引用本文: 商效瑀, 黄文逸, 方泽宇, 等. 人工冷粘结轻骨料高强混凝土制备及性能[J]. 复合材料学报, 2024, 42(0): 1-11.
SHANG Xiaoyu, HUANG Wenyi, FANG Zeyu, et al. Preparation and properties of artificial cold-bonded lightweight aggregate high-strength concrete[J]. Acta Materiae Compositae Sinica.
Citation: SHANG Xiaoyu, HUANG Wenyi, FANG Zeyu, et al. Preparation and properties of artificial cold-bonded lightweight aggregate high-strength concrete[J]. Acta Materiae Compositae Sinica.

人工冷粘结轻骨料高强混凝土制备及性能

基金项目: 吉林省发改委产业技术研究与开发专项项目(2021C038-6); 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,教授,硕士生导师,研究方向为低碳混凝土技术 、固体废弃物科学、绿色建筑技术与理论 E-mail:shangxiaoyu@neepu.edu.cn

  • 中图分类号: TU528.2

Preparation and properties of artificial cold-bonded lightweight aggregate high-strength concrete

Funds: Development and Reform Commission Funding of Jilin Province (2021C038-6); Major Program of Science and Technology Project of the Educational Commission of Jilin Province (JJKH20240155KJ)
  • 摘要: 以搅拌站混凝土废浆(Concrete slurry waste, CSW)为原料,利用冷粘结造粒技术结合碳化增强工艺,制备了一种性能优异的人工骨料(Artificial aggregate, AA),并发展了轻骨料高强混凝土(Lightweight aggregate high-strength concrete, LAHC),重点研究了AA的物理性能、力学性能和微观结构,以及LAHC的工作性能、力学性能和收缩性能。研究结果表明,以CSW为原料,利用冷粘结技术结合碳化增强工艺生产的AA,具备可行性;球形AA粒度分布主要在4.75~14 mm之间,松散堆积密度介于950~1100 kg/m3之间,1 h吸水率为9.96%~12.89%。单颗颗粒强度变化范围为13.68~15.64 MPa,筒压强度介于8.18~9.17 MPa;加压碳化3 d对于AA单颗颗粒强度和筒压强度提高约14%和12%,湿法碳化10 min提高约9%和8%,吸水率分别下降约23%和14%,湿法碳化表现出更高的效率优势;制备的人工LAHC 28 d抗压强度可达45.2 MPa,抗折强度4.7 MPa,密度1807.6 kg/m3,满足LAHC的要求;球形AA借助滚珠效应自身具备一定减水功能,预湿处理有助于缓解轻骨料混凝土收缩问题,对AA进行24 h的预湿处理,可以将其90 d的收缩率减少10.0%。研究成果为新一代的混凝土材料低碳化、可持续化提供参考。

     

  • 图  1  人工骨料制备流程

    Figure  1.  Artificial aggregate preparation process

    图  2  二次投料搅拌法

    Figure  2.  Secondary batch mixing method

    图  3  筒压强度和单颗颗粒强度测试示意图

    Figure  3.  Schematic diagram of cylinder compressive strength and individual pellet strength

    图  4  不同养护方式的人工冷粘结轻骨料的性能

    Figure  4.  Properties of artificial aggregates with different curing methods

    图  5  不同养护方式的人工骨料的SEM-EDS

    Figure  5.  SEM-EDS of artificial aggregate with different curing methods

    图  6  混凝土拌合物工作性能试验

    Figure  6.  Workability test for concrete mixture

    图  7  混凝土拌合物的工作性能

    Figure  7.  Workability of concrete mixture

    图  8  混凝土的干表观密度和抗压强度

    Figure  8.  Dry apparent density and compressive strength of concrete

    图  9  混凝土的抗折强度和折压比

    Figure  9.  Flexural strength and bend-press ratio of concrete

    图  10  混凝土的干燥收缩率

    Figure  10.  Drying shrinkage of concrete

    表  1  水泥、粉煤灰、硅灰和混凝土废浆料化学成分(wt%)

    Table  1.   Chemical composition of cement, fly ash, silica fume and concrete slurry waste (wt%)

    Material SiO2 CaO Al2O3 Fe2O3 MgO SO3 TiO2 K2O Na2O LOI
    Cement 20.25 62.30 6.04 3.41 2.01 3.65 0.39 0.84 0.17 3.24
    FA 76.24 2.84 14.24 2.34 0.81 0.91 0.48 1.72 4.76
    SF 92.40 0.55 1.32 0.16 0.42 3.09 0.90 0.13 0.35
    CSW 32.65 35.27 8.31 6.64 1.39 2.98 0.53 1.72 10.35
    Notes: FA-Fly ash; SF-Silica fume; CSW-Concrete slurry waste; LOI-Loss on ignition.
    下载: 导出CSV

    表  2  混凝土配合比

    Table  2.   Mix proportion of concrete

    NO. W/C/
    (kg·m−3)
    Cement/
    (kg·m−3)
    FA/
    (kg·m−3)
    SF/
    (kg·m−3)
    NCA/
    (kg·m−3)
    AA/
    (kg·m−3)
    S/
    (kg·m−3)
    Water/
    (kg·m−3)
    SP/
    (kg·m−3)
    Pre-wetting
    time/ h
    LAC1 0.29 350 100 50 0 828.52 470.25 145 5.75 0
    LAC2 0.29 350 100 50 0 828.52 470.25 145 5.75 1
    LAC3 0.29 350 100 50 0 828.52 470.25 145 5.75 24
    LAC4 0.31 350 100 50 0 828.52 470.25 155 5.75 24
    LAC5 0.33 350 100 50 0 828.52 470.25 165 5.75 24
    L-NAC 0.33 350 100 50 569.42 414.26 470.25 165 5.75 24
    NAC 0.33 350 100 50 1138.83 0 470.25 165 5.75 24
    Notes: LAC-Lightweight aggregate concrete; LAC1, LAC2 and LAC3-Lightweight aggregate concrete with pre-wetting time of 0 h, 1 h and 24 h , respectively; LAC3, LAC4 and LAC5-Lightweight aggregate concrete with water-cement ratio of 0.29, 0.31 and 0.33, respectively; LAC5, L-NAC and NAC-Lightweight aggregate concrete with the replacement ratio of 100%, 50% and 0%, respectively; W/C-Water-cement ratio; NCA-Natural coarse aggregate; AA-Artificial aggregate; S-Sand; SP-Superplasticizer.
    下载: 导出CSV
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  • 收稿日期:  2024-03-19
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