| 氧化石墨烯/再生水泥基复合材料的制备 |
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| 引用本文： | 桂灿,徐子芳,江玉洁,李世豪.氧化石墨烯/再生水泥基复合材料的制备[J].复合材料学报,2021,38(5):1526-1534. |
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| 作者姓名： | 桂灿 徐子芳 江玉洁 李世豪 |
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| 作者单位： | 安徽理工大学 材料科学与工程学院,淮南232001 |
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| 基金项目： | 2017年度安徽高校省级自然科学重大研究项目(KJ2017ZD08)；2019年度省级大学生创新创业训练计划项目(S201910361140；S201910361150X) |
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| 摘 要： | 基于建筑垃圾再生细骨料替代天然砂，进行氧化石墨烯(GO)改性再生水泥基复合材料的综合物理性能和水化机制研究。采用超声分散GO及振动搅拌制备再生水泥基复合材料，综合耐久性能测试结果表明:和不掺GO再生水泥基复合材料相比，添加0.03% GO改性7 d龄期强度的GO/再生水泥基复合材料抗折和抗压强度分别提高了16%和21%；添加0.02% GO改性的28 d龄期强度的GO/再生水泥基复合材料抗折和抗压分别提高了13.7%和13.6%。GO/再生水泥基复合材料龄期7 d耐候、50次冻融循环后力学性能均良好；氯离子含量皆小于0.06%。放射性检测结果表明:GO/再生水泥基复合材料内照射指数IRa和外照射指数Ir均属于A类建筑材料。通过XRD、TG-DTA、SEM等手段对GO/再生水泥基复合材料水化机制研究表明:GO促进了钙矾石(AFt)晶体的大量生成及胶凝孔中存在更多的自由水，且对后期氢氧化钙(CH)的产生有抑制作用，进而提高了GO/再生水泥基复合材料综合物理性能。
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| 关 键 词： | 回收骨料 氧化石墨烯 水泥基复合材料 微观结构 水泥水化 |
| 收稿时间： | 2020-09-17 |
Preparation of graphene oxide/recycled cement-based composite materials |
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| Affiliation: | School of Material Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China |
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| Abstract: | Based on the replacement of natural sand by recycled fine aggregate from construction waste, the comprehensive physical properties and hydration mechanism of graphene oxide (GO) modified recycled cement-based composites were studied. The recycled cement-based composites were prepared by ultrasonic dispersion GO and vibration stirring. The comprehensive durability test results show that compared with recycled cement-based materials without GO, the flexural and compressive strength of the GO/recycled cement-based composites modified with 0.03% GO at 7 d age increase by 16% and 21%, respectively. The flexural strength and compressive strength of GO/recycled cement-based composites modified by 0.02% GO at 28 d age increase by 13.7% and 13.6%, respectively. The GO/recycled cement-based composite has a 7 d weather resistance and good mechanical properties after 50 freeze-thaw cycles; the chloride ion content is less than 0.06%. The radioactivity test results show that internal exposure index IRa and external exposure index Ir of GO/recycled cement-based composites belong to Class A building materials. The hydration mechanism of the GO/recycled cement-based composites was studied by XRD, TG-DTA, SEM and other means, the results show that GO promotes the large-scale formation of ettringite (AFt) crystals, and the presence of more free water in the gel pores, and has an inhibitory effect on the later generation of calcium hydroxide (CH), thereby improving the synthesis of GO/recycled cement-based composites physical properties. |
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