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不同尺寸钙矾石的制备及其对胶砂力学性能的影响

曹卫华 陈烽 刘晓 姚燕 钱珊珊

曹卫华, 陈烽, 刘晓, 等. 不同尺寸钙矾石的制备及其对胶砂力学性能的影响[J]. 复合材料学报, 2024, 42(0): 1-10.
引用本文: 曹卫华, 陈烽, 刘晓, 等. 不同尺寸钙矾石的制备及其对胶砂力学性能的影响[J]. 复合材料学报, 2024, 42(0): 1-10.
CAO Weihua, CHEN Feng, LIU Xiao, et al. Preparation of ettringite with different aspect ratios and its effect on the mechanical properties of mortar[J]. Acta Materiae Compositae Sinica.
Citation: CAO Weihua, CHEN Feng, LIU Xiao, et al. Preparation of ettringite with different aspect ratios and its effect on the mechanical properties of mortar[J]. Acta Materiae Compositae Sinica.

不同尺寸钙矾石的制备及其对胶砂力学性能的影响

基金项目: 国家自然科学基金 (52372020)
详细信息
    通讯作者:

    钱珊珊,博士,高级工程师,硕士生导师,研究方向为高性能混凝土、混凝土外加剂、混凝土耐久性及相关材料的研究与开发 E-mail: qianshanshan4410@163.com

  • 中图分类号: TU528.042.2

Preparation of ettringite with different aspect ratios and its effect on the mechanical properties of mortar

Funds: National Natural Science Foundation of China (52372020)
  • 摘要: 为探究不同尺寸钙矾石对胶砂早强性能的影响,本文使用不同分散剂制得不同尺寸的钙矾石(AFt-0、AFt-1和AFt-2),通过红外光谱(IR)、X射线衍射(XRD)及电镜形貌(SEM)对制备的系列AFt进行表征,通过胶砂抗压强度、胶砂微观形貌、水泥水化热、水泥凝结时间等分析手段比较不同尺寸钙矾石对胶砂的力学性能、微观结构及水化作用的影响。结果表明:加入分散剂能控制钙矾石尺寸大小,同时提高钙矾石在溶液中的悬浮稳定性。不同尺寸钙矾石掺入胶砂后均能提高其早期抗压强度,而随着钙矾石尺寸减小,早期抗压强度提升幅度更大,其中掺入AFt-2的胶砂8 h抗压强度较同龄期空白样提高了225%,接近空白样1 d的抗压强度。从胶砂微观结构中也可以看出,掺入钙矾石尺寸越小,胶砂中钙矾石的早期形成量越多,这利于胶砂形成早期骨架体系。通过水化热分析也发现,随着钙矾石尺寸减小,水泥水化速度加快,水泥凝结时间缩短。

     

  • 图  1  分散剂的GPC(a)和1H NMR(b)谱图

    Figure  1.  GPC (a) and 1H NMR (b) spectra of dispersants

    图  2  钙矾石的FT-IR谱图

    Figure  2.  FT-IR spectrum of ettringite

    图  3  钙矾石的形貌

    Figure  3.  Morphology of ettringite

    图  4  钙矾石的XRD谱图

    Figure  4.  XRD spectrum of ettringite

    图  5  钙矾石的粒径分布

    Figure  5.  Crystal nucleus grain size distribution of ettringite

    图  6  钙矾石的抗离心稳定性

    Figure  6.  Centrifugal stability of ettringite

    图  7  不同尺寸钙矾石对胶砂抗压强度的影响

    Figure  7.  Influence of different sizes of ettringite on compressive strength of foundry sand

    图  8  不同尺寸钙矾石对胶砂微观形貌的影响

    Figure  8.  Influence of different sizes of ettringite on microscopic morphology of foundry sand

    图  9  不同尺寸钙矾石对水泥水化放热曲线的影响

    Figure  9.  Influence of different sizes of ettringite on heat release curve of foundry sand

    图  10  不同尺寸钙矾石对水泥凝结时间的影响

    Figure  10.  Influence of different sizes of ettringite on cement setting time

    图  11  水泥溶液体系中AFt-2的作用模型

    Figure  11.  Model of the role of AFt-2 in cementitious solution system

    表  1  水泥的主要化学组成

    Table  1.   Main chemical composition of cement

    CementSiO2CaOMgOFe2O3Al2O3SO3Na2OK2O
    Reference/wt%20.0663.322.463.025.282.690.060.76
    下载: 导出CSV

    表  2  分散剂组成及GPC数据

    Table  2.   Composition and GPC data of dispersants

    Dispersantn(AA):n(KH-570):n(TPEG2400)MnMwPDI
    PCE-14:0:125400427001.68
    PCE-24:1:135000690001.97
    Notes: GPC is gel permeation chromatography; AA is acrylic acid; KH-570 is γ-methacryloxypropyl trimethoxy silane; TPEG2400 is isobutene polyoxyethylene ether with a molecular weight of 2400; Mn is the number average molecular weight; Mw is the weight average molecular weight; PDI is the polymer dispersity index; PCE-1 and PCE-2 are dispersants prepared.
    下载: 导出CSV

    表  3  钙矾石合成原料

    Table  3.   Raw materials for the synthesis of ettringite

    SampleComposition of synthetic materials
    AFt-0Ca(NO3)2·4 H2OAl2(SO4)3·18 H2O-
    AFt-1Ca(NO3)2·4 H2OAl2(SO4)3·18 H2OPCE-1
    AFt-2Ca(NO3)2·4 H2OAl2(SO4)3·18 H2OPCE-2
    下载: 导出CSV
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  • 收稿日期:  2024-04-26
  • 修回日期:  2024-05-29
  • 录用日期:  2024-06-06
  • 网络出版日期:  2024-06-22

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