| 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%. |
| 关键词: 界面黏结 碱式硫酸镁水泥 树脂 透光混凝土 剪切强度 |
| DOI：10.3969/j.issn.1007-9629.2024.11.009 |
| 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） |
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| Interface Bonding Mechanism of Basic Magnesium Sulfate Cement-Based Resin Light-Transmitting Concrete |
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XU Xun1, SUN Yongtao1, LI Yingjiang1, WANG Zonghao1, YOU Panli2
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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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| 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. |
| Key words: interface bonding basic magnesium sulfate cement resin light-transmitting concrete shear strength |
