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新拌低水胶比水泥浆体流变性能影响因素及流变参数预测方法

王鹏刚 高义志 陈际洲 左文强 冯家润 郑瑞剑

王鹏刚, 高义志, 陈际洲, 等. 新拌低水胶比水泥浆体流变性能影响因素及流变参数预测方法[J]. 复合材料学报, 2024, 42(0): 1-10.
引用本文: 王鹏刚, 高义志, 陈际洲, 等. 新拌低水胶比水泥浆体流变性能影响因素及流变参数预测方法[J]. 复合材料学报, 2024, 42(0): 1-10.
WANG Penggang, GAO Yizhi, CHEN Jizhou, et al. Influencing factors of rheological properties and prediction of rheological behavior of fresh low water-to-cement ratio cement pastes[J]. Acta Materiae Compositae Sinica.
Citation: WANG Penggang, GAO Yizhi, CHEN Jizhou, et al. Influencing factors of rheological properties and prediction of rheological behavior of fresh low water-to-cement ratio cement pastes[J]. Acta Materiae Compositae Sinica.

新拌低水胶比水泥浆体流变性能影响因素及流变参数预测方法

基金项目: 十四五国家重点研发计划(2023 YFB3711400);江苏省青年科技基金(BK20230865);山东省自然科学面上项目(ZR202103020358);泰山学者青年专家(tsqn202306231)
详细信息
    通讯作者:

    左文强,博士,博士生导师,研究方向为流态混凝土、增材制造混凝土以及面向深空建造的先进土木工程材料的材料设计、微结构分析、性能优化 E-mail:wenqiangzuo@seu.edu.cn

  • 中图分类号: TU52

Influencing factors of rheological properties and prediction of rheological behavior of fresh low water-to-cement ratio cement pastes

Funds: 14 th Five-Year Plan for National Key Research and Program(2023 YFB3711400);Jiangsu Youth Science and Technology Fund(BK20230865);Shandong Provincial Natural Science Foundation General Project(ZR202103020358);Mount Taishan Scholar Young Expert(tsqn202306231)
  • 摘要: 高性能混凝土流变性能较差的稳定性以及较为复杂的调控方法,是影响其在土木工程建设中推广应用的重要因素之一。基于堆积密度试验、流变试验和总有机碳吸附试验,研究了矿粉和粉煤灰掺量对低水胶比水泥浆体流变参数的影响规律。结果表明:当矿粉和粉煤灰体积掺量在0%~15%之间时,随着掺量的增加,复合胶凝材料体系的堆积密度提高,水泥浆体的屈服应力和塑性粘度降低,并且上述规律随着减水剂掺量和矿物掺合料取代量的增加更加明显。胶凝材料表面的吸附-脱附平衡速率常数只与减水剂性质有关,对于本试验所用的减水剂拟合值为12。通过颗粒堆积理论和经典流变模型分析得到,矿粉和粉煤灰主要通过影响复合胶凝材料体系的凝胶作用力和相对堆积密实度,影响水泥浆体的流变性能。基于此提出了适用于水泥-矿粉和水泥-粉煤灰体系的低水胶比水泥浆体流变性能预测及优化方法。

     

  • 图  1  胶凝材料的微观形貌

    Figure  1.  Microscopic morphologies of cementitious materials

    图  2  水泥浆体流变性能测试程序

    Figure  2.  Test procedure for rheological properties of cement pastes

    图  3  矿粉和粉煤灰掺量对水泥浆体堆积密度影响

    Figure  3.  Effect of blast furnace slag and fly ash on packing density of cement pastes

    图  4  矿粉和粉煤灰掺量对水泥浆体流变曲线影响

    Figure  4.  Effect of blast furnace slag and fly ash on rheological curves of cement pastes

    图  5  矿粉和粉煤灰掺量对水泥浆体流变参数影响

    Figure  5.  Effect of blast furnace slag and fly ash on rheological parameters of cement paste

    图  6  矿粉和粉煤灰掺量对水泥浆体等温吸附曲线的影响

    Figure  6.  Effect of blast furnace slag and fly ash on isothermal adsorption curves of cement paste

    图  7  减水剂表面覆盖率随其相对掺量(即实际掺量与饱和掺量之比)的变化

    Figure  7.  Surface coverage of polymers in SP as a function of its relative dosage (i.e., the ratio between the real dosage and the saturated dosage of SP)

    图  8  减水剂掺量对不同体系胶凝材料颗粒相对表面间分开距离的影响

    Figure  8.  Effect of SP dosage on the separation distance between the relative surfaces of cementitious materials of different systems

    图  9  复合体系堆积密度计算值与试验值的关系

    Figure  9.  Relationship between computed and measured packing density of cementitious particles

    图  10  复合体系水泥浆体流变参数计算值与试验值的关系

    Figure  10.  Relationship between calculated and experimental values of rheological parameters for blended systems

    表  1  胶凝材料的化学组成(wt%)

    Table  1.   Chemical composition of cementitious material(wt%)

    MaterialSiO2Al2O3CaOMgOFe2O3SO3K2OOthers
    OPC21.265.5362.423.242.892.831.120.71
    BFS33.1812.5938.1611.242.671.140.360.66
    FA61.1220.148.341.037.1601.370.84
    Notes: OPC is ordinary Portland cement. BFS is blast furnace slag. FA is fly ash.
    下载: 导出CSV

    表  2  水泥净浆配合比

    Table  2.   Mix proportion of cement pastes

    SampleMix proportion/(kg·m−3)Water/
    binder ratio
    OPCFABFSSP
    REF1899.50058.90.21
    F-5%1804.573.6058.20.21
    F-10%1709.5147.3057.60.21
    F-15%1614.6220.9056.90.21
    S-5%1804.5087.258.60.21
    S-10%1709.50174.358.40.21
    S-15%1614.60261.558.20.21
    Notes: REF is the control group of pure cement system; Numbers after F and S are the volume ratios to cement; F is blast furnace slag; S is fly ash.
    下载: 导出CSV

    表  3  减水剂在不同胶凝材料体系中的饱和掺量Dsat

    Table  3.   Saturated dosage of Dsat SP in different cementitious material systems

    SampleDsat
    REF0.61
    S-5%0.79
    S-10%0.85
    S-15%0.89
    F-5%0.63
    F-10%0.67
    F-15%0.68
    下载: 导出CSV
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  • 收稿日期:  2024-01-23
  • 修回日期:  2024-03-10
  • 录用日期:  2024-03-19
  • 网络出版日期:  2024-04-19

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