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UHPC与混凝土基体间界面剪切强度的影响因素

薛善彬 荆蜂杰 王丹 张鹏 高小建

薛善彬, 荆蜂杰, 王丹, 等. UHPC与混凝土基体间界面剪切强度的影响因素[J]. 复合材料学报, 2024, 42(0): 1-10.
引用本文: 薛善彬, 荆蜂杰, 王丹, 等. UHPC与混凝土基体间界面剪切强度的影响因素[J]. 复合材料学报, 2024, 42(0): 1-10.
XUE Shanbin, JING Fengjie, WANG Dan, et al. Factors influencing interfacial shear strength between UHPC and concrete substrate[J]. Acta Materiae Compositae Sinica.
Citation: XUE Shanbin, JING Fengjie, WANG Dan, et al. Factors influencing interfacial shear strength between UHPC and concrete substrate[J]. Acta Materiae Compositae Sinica.

UHPC与混凝土基体间界面剪切强度的影响因素

基金项目: 国家自然科学基金(U2106220;52008222);国家重点研发计划项目(2021YFB2600704);山东省杰出青年基金(ZR2021JQ17)
详细信息
    通讯作者:

    张鹏,博士,教授,博士生导师,研究方向为混凝土耐久性 E-mail: peng.zhang@qut.edu.cn

  • 中图分类号: TU528

Factors influencing interfacial shear strength between UHPC and concrete substrate

Funds: National Natural Science Foundation of China (U2106220; 52008222); National Key Research and Development Program Project (2021YFB2600704); Shandong Province Outstanding Youth Fund (ZR2021JQ17)
  • 摘要: 超高性能混凝土(Ultra-high performance concrete, UHPC)具备优异的力学与抗渗性能,在混凝土结构补强加固工程中有着广阔的应用前景,如何提高UHPC与既有基体间的粘结性能成为土木工程领域普遍关心的重要课题。本文利用标准养护条件制备的试件开展试验研究,首先研究了UHPC水胶比与混凝土基体初始含水饱和度对二者间界面剪切强度的影响规律。此外,选取特定配合比的UHPC,研究了其与不同饱和度混凝土间界面剪切强度随龄期的演化规律。向UHPC中掺入预湿轻骨料以实现内养护,考虑UHPC中轻骨料取代率、混凝土基体含水饱和度的影响,研究了不同龄期养护后轻骨料UHPC与混凝土基体间界面剪切强度的演化规律。利用扫描电镜技术观测了UHPC与混凝土间界面的微结构。结果表明:(1)对于未掺轻骨料的UHPC:不论水胶比如何变化,其与饱水基体间的界面剪切强度最高,而与干燥基体间的界面剪切强度最低;其与干燥基体间的界面剪切强度随水胶比的升高而降低,与预湿基体间的界面剪切强度随水胶比的升高而先增长后降低。(2)水胶比为0.154的UHPC与不同饱和度基体间28 d时的界面剪切强度均较7 d时显著增长;90 d时,其仅与50%饱和度基体间的界面剪切强度进一步显著增长。(3)低轻骨料取代率能够提高UHPC与干燥基体间7 d时的界面剪切强度,而高轻骨料取代率能够显著提高UHPC与干燥基体间28 d和90 d时的界面剪切强度;28 d和90 d时,轻骨料UHPC与50%饱和度基体间的界面剪切强度显著高于干燥基体;7 d时,不同轻骨料取代率的UHPC与饱水基体间便可形成一定的界面剪切强度,且该强度在28 d和90 d时均进一步增长。

     

  • 图  1  UHPC-混凝土基体复合体制备流程

    Figure  1.  Preparation flow of UHPC-concrete substrate composite

    图  2  界面剪切强度测试

    Figure  2.  Interface shear strength test

    图  3  扫描电镜试验取样与测试

    Figure  3.  Sampling and testing of scanning electron microscope (SEM) test

    图  4  不同水胶比UHPC与不同饱和度混凝土间的界面剪切强度

    Figure  4.  Interfacial shear strength between UHPC with different w/b and concrete with different saturation

    图  5  不同龄期养护后UHPC与不同饱和度混凝土基体间的界面剪切强度

    Figure  5.  Interfacial shear strength between UHPC and concrete substrate with different saturation after curing at different ages

    图  6  不同轻骨料取代率UHPC与干燥混凝土基体间界面剪切强度

    Figure  6.  Interfacial shear strength between UHPC with different LWA replacement rates and dry concrete substrate

    图  7  内掺轻骨料UHPC与干燥混凝土基体的粘结过程

    Figure  7.  Bonding process between UHPC incorporating LWA and dry concrete substrate

    图  8  不同轻骨料取代率UHPC与部分饱水混凝土基体间界面剪切强度

    Figure  8.  Interfacial shear strength between UHPC with different LWA replacement rates and partially saturated concrete substrate

    图  9  不同轻骨料取代率UHPC与饱水混凝土基体间界面剪切强度

    Figure  9.  Interfacial shear strength between UHPC with different LWA replacement rates and water-saturated concrete substrate

    图  10  基于扫描电镜的UHPC与混凝土基体间界面微结构观测

    Figure  10.  Microstructural observation of the interface between UHPC and concrete substrate based on SEM

    The nomenclature rule for the specimens is “the saturation of substrate - the replacement rate of LWA in UHPC”

    表  1  超高性能混凝土(UHPC)配合比(kg/m3)

    Table  1.   Mix proportion of ultra-high performance concrete (UHPC) (kg/m3)

    Groups Cement Silica fume Quartz sand Water SP Steel fiber LWA
    UHPC-00 770 230 1000 154 42 156 0
    UHPC-10 770 230 900 154 42 156 96
    UHPC-20 770 230 800 154 42 156 192
    UHPC-30 770 230 700 154 42 156 288
    25-UHPC 770 230 1000 250 20 156 0
    30-UHPC 770 230 1000 300 16 156 0
    Notes: SP denotes superplasticizer. LWA represents lightweight aggregate. The UHPC group with a LWA replacement rate of 0%, 10%, 20% and 30% is designated as UHPC-00, UHPC-10, UHPC-20, UHPC-30. The UHPC group with a water-binder ratio (w/b) of 0.25 and 0.30 is designated as 25-UHPC and 30-UHPC, respectively.
    下载: 导出CSV

    表  2  混凝土基体配合比(kg/m3)

    Table  2.   Mix proportion of concrete substrate (Unit: kg/m3)

    CementCoarse aggregateFine aggregateWater
    3751125750200
    下载: 导出CSV

    表  3  各组变量汇总表

    Table  3.   Summary table of variables for each group

    Groups w/b Saturation of the substrate Replacement rate LWA Curing age
    UHPC-00 0.154 0%、50%、100% 0% 7 d、28 d、90 d
    25-UHPC 0.25 0%、50%、100% 0% 28 d
    30-UHPC 0.30 0%、50%、100% 0% 28 d
    UHPC-10 0.154 0%、50%、100% 10% 7 d、28 d、90 d
    UHPC-20 0.154 0%、50%、100% 20% 7 d、28 d、90 d
    UHPC-30 0.154 0%、50%、100% 30% 7 d、28 d、90 d
    Note: w/b refers to the water-binder ratio of UHPC.
    下载: 导出CSV
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  • 收稿日期:  2024-01-09
  • 修回日期:  2024-02-15
  • 录用日期:  2024-03-08
  • 网络出版日期:  2024-04-13

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