碱式硫酸镁水泥基树脂透光混凝土的界面黏结机理
作者:
作者单位:

1.西南科技大学 土木工程与建筑学院,四川 绵阳 621010;2.西昌学院 土木与水利工程学院,四川 西昌615013

作者简介:

徐 迅(1977—),男,湖南津市人,西南科技大学特聘教授,硕士生导师,博士.E-mail:15550045@qq.com

通讯作者:

徐 迅(1977—),男,湖南津市人,西南科技大学特聘教授,硕士生导师,博士.E-mail:15550045@qq.com

中图分类号:

TU528.38

基金项目:

四川省科技计划省院省校合作项目(2023YFSY0019);泸州市科技计划项目(2023JYJ061);西南科技大学智慧教育研究中心资助项目(22ZHJYYB04)


Interface Bonding Mechanism of Basic Magnesium Sulfate Cement-Based Resin Light-Transmitting Concrete
Author:
Affiliation:

1.School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China;2.School of Civil and Hydraulic Engineering, Xichang University, Xichang615013, China

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    摘要:

    使用碱式硫酸镁水泥(BMSC)作为基体材料,制备了树脂透光混凝土(RLTC),并利用界面剪切强度测试、超景深三维显微镜和扫描电镜(SEM)等分析了BMSC基体与树脂的界面黏结性能.结果表明:BMSC与树脂界面处裂纹较少且宽度较窄,在界面处观察到大量针状5·1·7相(5Mg(OH)2·MgSO4·7H2O)结构,微米级5·1·7相晶须填充了BMSC基体与树脂的孔隙,增强了界面间的机械啮合作用;与使用普通硅酸盐水泥的RLTC相比,硬化后BMSC基体与树脂的界面黏结性能明显提高,其中28 d界面剪切强度提高了59.2%.

    Abstract:

    Resin light-transmitting concrete(RLTC) was prepared using basic magnesium sulfate cement(BMSC). Interfacial shear strength testing, ultra-deep field 3D microscopy, and scanning electron microscopy(SEM) were used to analyze the interfacial bonding performance between the BMSC matrix and resin. The results indicate that there are few interface cracks between the BMSC matrix and the resin, with relatively narrow crack widths. A large number of needle-like 5·1·7 phase(5Mg(OH)2·MgSO4·7H2O) structure are observed at the interface, where micro-scale 5·1·7 phase crystals fill the pores between the matrix and resin, enhancing the mechanical interlocking effect. Compared to RLTC prepared with ordinary Portland cement, the interfacial bonding performance between the BMSC matrix and resin are significantly improved after curing, with a 59.2% increase in interface shear strength at 28 d.

    表 2 七水硫酸镁的化学组成Table 2 Chemical composition(by mass) of MgSO4·7H2O
    表 3 固硫灰和砂的化学组成Table 3 Chemical compositions(by mass) of CFBCA and sand
    表 1 轻烧氧化镁的化学组成Table 1 Chemical composition(by mass) of LBM
    表 5 PO砂浆的配合比Table 5 Mix proportion of PO mortar
    图1 拉拔试验示意图Fig.1 Schematic diagram of pull-out test
    图2 树脂与不同水泥基体间的界面剪切强度Fig.2 Interfacial shear strength between resin and different cement matrices
    图3 2种水泥基体的抗压强度及强度发展规律Fig.3 Compressive strength and strength development law of two cement matrices
    图4 BMSC与PO基体制备的RLTC的表观与破坏形貌Fig.4 Surface appearance and failure morphology of RLTC prepared with BMSC and PO matrices
    图5 破坏前树脂与水泥基体界面的SEM照片Fig.5 SEM images of interface between resin and cement matrix before destruction
    图6 破坏前后树脂和水泥基体界面的超景深三维显微镜图像Fig.6 Ultra-deep 3D microscopic images of interface between resin and cement matrix before and after destruction
    图7 树脂与水泥基体界面水化产物的SEM照片Fig.7 SEM images of hydration product in interface between resin and cement matrix
    图8 水泥基体与树脂界面黏结模型Fig.8 Interface bonding model between cement matrix and resin
    图9 BMSC基体与树脂界面的受力示意图Fig.9 Schematic diagram of interface bonding force between BMSC matrix and resin
    表 4 BMSC砂浆的配合比Table 4 Mix proportion of BMSC mortar
    表 6 树脂与水泥基体的最大拉拔荷载Table 6 Maximum pull-out load between resin and cement matrix
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徐迅,孙永涛,李莹江,王宗浩,游潘丽.碱式硫酸镁水泥基树脂透光混凝土的界面黏结机理[J].建筑材料学报,2024,27(11):1039-1046

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  • 收稿日期:2023-12-07
  • 最后修改日期:2024-09-13
  • 在线发布日期: 2024-12-10
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