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浇筑期温度对泡沫混凝土性能和微孔结构的影响

刘鑫 姚云龙 张思卿 史云强 洪宝宁

刘鑫, 姚云龙, 张思卿, 史云强, 洪宝宁. 浇筑期温度对泡沫混凝土性能和微孔结构的影响[J]. 西南交通大学学报, 2024, 59(5): 1123-1131. doi: 10.3969/j.issn.0258-2724.20220179
引用本文: 刘鑫, 姚云龙, 张思卿, 史云强, 洪宝宁. 浇筑期温度对泡沫混凝土性能和微孔结构的影响[J]. 西南交通大学学报, 2024, 59(5): 1123-1131. doi: 10.3969/j.issn.0258-2724.20220179
LIU Xin, YAO Yunlong, ZHANG Siqing, SHI Yunqiang, HONG Baoning. Influence of Temperature on Performance and Microporous Structure of Foamed Concrete During Pouring Period[J]. Journal of Southwest Jiaotong University, 2024, 59(5): 1123-1131. doi: 10.3969/j.issn.0258-2724.20220179
Citation: LIU Xin, YAO Yunlong, ZHANG Siqing, SHI Yunqiang, HONG Baoning. Influence of Temperature on Performance and Microporous Structure of Foamed Concrete During Pouring Period[J]. Journal of Southwest Jiaotong University, 2024, 59(5): 1123-1131. doi: 10.3969/j.issn.0258-2724.20220179

浇筑期温度对泡沫混凝土性能和微孔结构的影响

doi: 10.3969/j.issn.0258-2724.20220179
基金项目: 国家自然科学基金项目(51609071)
详细信息
    作者简介:

    刘鑫(1984—),男,副教授,博士,研究方向为岩土微细结构试验与损伤,E-mail:liuxin100@hhu.edu.cn

  • 中图分类号: TU528.2

Influence of Temperature on Performance and Microporous Structure of Foamed Concrete During Pouring Period

  • 摘要:

    泡沫混凝土在浇筑至固化成型这段时期内,易受温度等环境因素影响,不利环境因素会导致固化成型后泡沫混凝土的性能退化和劣化. 为研究泡沫混凝土在浇筑期受温度(−15~70 ℃)影响后的性能和微孔结构,设计单因素室内试验方案,以干密度作为泡沫混凝土物理性质评价指标,抗压强度作为施工质量评价指标,吸水率用以评价泡沫混凝土的运营耐久性,并利用图像数据采集系统及Image J软件分析泡沫混凝土微孔结构的演变规律. 结果表明:随着温度上升,泡沫混凝土干密度总体呈阶梯式下降,抗压强度先减小后增大再减小,吸水率以0 ℃为分界点,温度降低或升高均呈先增大后减小趋势;等效孔径先增大后减小再增大,孔隙圆度值先增大后减小,孔隙分布分维先减小后变大;从混凝土宏观性能和微孔结构的演变规律建议泡沫混凝土浇筑期施工的温度范围为−5~40 ℃.

     

  • 图 1  微孔结构测试

    Figure 1.  Microporous structure testing

    图 2  浇筑期温度对泡沫混凝土干密度的影响

    Figure 2.  Effect of temperature on dry density of foamed concrete during pouring period

    图 3  浇筑期温度对泡沫混凝土抗压强度的影响

    Figure 3.  Effect of temperature on compressive strength of foamed concrete during pouring period

    图 4  浇筑期温度对泡沫混凝土吸水率的影响

    Figure 4.  Effect of temperature on water absorption of foamed concrete during pouring period

    图 5  20 ℃以下的泡沫混凝土累计孔径分布

    Figure 5.  Cumulative pore size distribution of foamed concrete below 20 ℃

    图 6  20 ℃以下的泡沫混凝土孔径分布及对应孔隙

    Figure 6.  Pore size distribution and corresponding pore images of foamed concrete below 20 ℃

    图 7  20 ℃以上的泡沫混凝土累计孔径分布

    Figure 7.  Cumulative pore size distribution of foamed concrete above 20 ℃

    图 8  20 ℃以上的泡沫混凝土孔径分布及对应孔隙图

    Figure 8.  Pore size distribution and corresponding pore images of foamed concrete above 20 ℃

    图 9  浇筑期温度对泡沫混凝土孔隙圆度值的影响

    Figure 9.  Effect of temperature on pore roundness value of foamed concrete during pouring period

    图 10  浇筑期温度对泡沫混凝土孔隙分布分维的影响

    Figure 10.  Effect of temperature on fractal dimension of pore distribution of foamed concrete during pouring period

    表  1  水泥的主要化合物含量

    Table  1.   Main compound content of cement %

    名称SiO2K2OSO3CaOAl2O3Fe2O3MgONa2O
    含量20.310.392.1265.554.804.931.350.12
    下载: 导出CSV

    表  2  水泥的物理力学性能指标

    Table  2.   Physical and mechanical properties of cement

    细度 80 μm/%标准稠度用水量/%初凝时间/min终凝时间/min抗压强度/MPa
    3 d28 d
    1.2025.4816523228.745.4
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-03-09
  • 修回日期:  2022-08-24
  • 网络出版日期:  2023-11-09
  • 刊出日期:  2022-08-26

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