再生砖细骨料形态对混凝土流变行为与力学性能的影响
作者:
作者单位:

1.华北水利水电大学 土木与交通学院,河南 郑州 450045;2.同济大学 土木工程学院,上海 200092;3.华北水利水电大学 河南省生态建材工程国际联合实验室,河南 郑州 450045

作者简介:

党钧陶(1990—),男,河南郑州人,华北水利水电大学副教授,硕士生导师,博士.E-mail:dangjuntao@ncwu.edu.cn

通讯作者:

肖建庄(1968—),男,山东沂南人,同济大学教授,博士生导师,博士.E-mail:jzx@tongji.edu.cn

中图分类号:

TU528.01

基金项目:

国家自然科学基金资助项目(52208247)


Effect of Morphology of Recycled Fine Aggregate from Clay Bricks on Rheology Behavior and Mechanical Properties of Concrete
Author:
Affiliation:

1.School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, China;2.College of Civil Engineering, Tongji University, Shanghai 200092, China;3.International Joint Research Lab for Eco-building Materials and Engineering of Henan, North China University of Water Resources and Electric Power, Zhengzhou 450045, China

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    摘要:

    评价了再生砖细骨料(RFCB)的几何形状和表面形态,研究了RFCB颗粒级配和初始饱水度对混凝土流变行为与力学性能的影响.结果表明:相比天然河砂,RFCB几何形状不规则且形状参数较低,表面形态呈凹陷凸起状且粗糙度较大;RFCB复杂的物理特性导致新拌混凝土的屈服应力与塑性黏度增大,劈裂抗拉强度有所提高且对抗压强度无较大不利影响;适当降低RFCB的最小粒径和初始饱水度,虽会使混凝土的流变性能变差,但有助于在混凝土中形成以再生砖细骨料为软核、界面为硬壳的结构,从而提高了混凝土的力学性能.

    Abstract:

    The geometrical shape and surface morphology of recycled fine aggregate from clay brick(RFCB) were assessed, and the influence of particle size distribution and initial water saturation of RFCB on the rheology behavior and mechanical properties of concrete was explored. The results indicate that compared to natural river sand, the geometrical shape of RFCB shows irregular shape as well as lower morphological index, and the surface morphology of RFCB exhibites undulation topography with concave and convex as well as higher roughness value. Due to the complexity of physical characteristics of RFCB, both the yield stress and plastic viscosity of fresh concrete are increased, and the splitting tensile strength of hardened concrete is enhanced, but it has no significantly adverse effect on the compressive strength. Optimally reducing the minimum particle size and initial water saturation of RFCB result in a poor rheological behavior of fresh concrete, but it helps in forming soft core of inner RFCB and stiff shell of outer interface, thus enhances the mechanical properties.

    表 1 天然河砂和再生砖细骨料的物理性能指标Table 1 Physical characteristics of NAF and RFCB
    表 3 天然河砂和再生砖细骨料的表面形态参数Table 3 Surface morphological characteristic of NAF and RFCB
    图1 天然河砂和再生砖细骨料的颗粒级配曲线Fig.1 Grading curves of NAF and RFCB
    图2 天然河砂和再生砖细骨料的几何形状Fig.2 Geometrical shapes of NAF and RFCB
    图3 天然河砂和再生砖细骨料的几何形状参数Fig.3 Geometrical shape parameters of NAF and RFCB
    图4 天然河砂和再生砖细骨料的三维形貌照片Fig.4 3D morphology images of NAF and RFCB
    图5 新拌混凝土的流变性能Fig.5 Rheological properties of fresh concretes
    图6 不同养护龄期下再生砖细骨料混凝土的抗压强度Fig.6 Compressive strength of recycled concrete containing RFCB at different curing ages
    图7 再生砖细骨料混凝土养护28 d龄期时的劈裂抗拉强度Fig.7 Splitting tensile strength of recycled concrete containing RFCB curing for 28 d
    图8 再生砖细骨料混凝土养护180 d龄期时的SEM照片Fig.8 SEM images of recycled concretes containing RFCB curing for 180 d
    表 2 混凝土配合比Table 2 Mix proportions of concretes
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引用本文

党钧陶,刘耘池,肖建庄,李风兰,杨金龙.再生砖细骨料形态对混凝土流变行为与力学性能的影响[J].建筑材料学报,2024,27(7):629-636

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  • 收稿日期:2023-08-31
  • 最后修改日期:2023-11-06
  • 在线发布日期: 2024-08-09
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