Wang Jing, Wu Songze, Zhang Yunlong, Qian Xuesong
Key Laboratory for Comprehensive Energy Saving of Cold Regions Architecture of Ministry of Education, Jilin Jianzhu University, Xincheng Street, Changchun, 130118, Jilin, China.
School of Transportation Science and Engineering, Jilin Jianzhu University, Xincheng Street, Changchun, 130118, Jilin, China.
Sci Rep. 2025 Jan 23;15(1):2936. doi: 10.1038/s41598-025-86257-8.
To promote the recycling of waste glass and satisfy the demands of environmental sustainability for ultrahigh performance concrete (UHPC), in this study, glass sand was employed to partially or entirely replace machine-made sand, and steel fibres were incorporated to fabricate ultrahigh performance shotcrete (UHPS). The effects of glass sand and steel fibres on the mechanical and electrical properties of composite materials were analysed in this study. Furthermore, alkali‒silica reaction (ASR) tests and microstructural analyses were conducted. The results indicate that at higher steel fibre contents, the incorporation of glass sand does not reduce the compressive strength of the UHPS and that glass sand has no significant effect on the split tensile or flexural strength. When the steel fibre content is 2% and the replacement ratio of glass sand reaches 100%, the mechanical properties of the UHPS reach their maximum. The addition of glass sand negatively affects the electrical properties, whereas the use of steel fibres improves them. The results of the alkali‒silica reaction tests confirm that the use of glass sand does not induce harmful expansion reactions. The study revealed the trends in the mechanical and electrical properties of concrete from a microstructural perspective and provided explanations for the alkali‒silica reaction outcomes. This study provides technical support for the application of UHPS to tunnel linings.
为促进废玻璃的回收利用并满足超高性能混凝土（UHPC）对环境可持续性的要求，本研究采用玻璃砂部分或全部替代机制砂，并掺入钢纤维来制备超高性能喷射混凝土（UHPS）。本研究分析了玻璃砂和钢纤维对复合材料力学性能和电学性能的影响。此外，还进行了碱-硅反应（ASR）试验和微观结构分析。结果表明，在钢纤维含量较高时，掺入玻璃砂不会降低UHPS的抗压强度，且玻璃砂对劈裂抗拉强度或抗弯强度没有显著影响。当钢纤维含量为2%且玻璃砂替代率达到100%时，UHPS的力学性能达到最大值。玻璃砂的添加对电学性能有负面影响，而钢纤维的使用则改善了电学性能。碱-硅反应试验结果证实，使用玻璃砂不会引发有害的膨胀反应。该研究从微观结构角度揭示了混凝土力学性能和电学性能的变化趋势，并对碱-硅反应结果作出了解释。本研究为UHPS在隧道衬砌中的应用提供了技术支持。
