Enhancing fire resistance of lightweight high-performance cementitious composites using hollow microspheres

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-11-10 DOI:10.1016/j.cemconcomp.2024.105845

Jingwei Yang , Hyunuk Kang , Jusung Yang , Junil Pae , Caijun Shi , Juhyuk Moon

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引用次数: 0

Abstract

Fire is detrimental to skyscrapers. Lightweight high-performance concrete (L-HPC) developed by combining lightweight microspheres and ultra-high-performance concrete binder is promising for future mega infrastructure projects. This study investigates the fire resistance of lightweight high-performance cementitious composites developed using hollow ceramic microspheres (HCMs) and hollow glass microspheres (HGMs) at different temperatures. Experimental results show that incorporating lightweight microspheres significantly increases the residual compressive strength of L-HPC by maintaining those of HGMs and HCMs groups at 92 % and 78 %, respectively, at 900 °C. Furthermore, these lightweight microspheres effectively mitigate thermal spalling and crack propagation in L-HPC. Microstructural analysis indicates that the lightweight microspheres facilitate steam-pressure release. The melting of HGMs realizes interconnections in the pore channel, which are subsequently strengthened by HGM and matrix-binder reactions. The HCMs feature perforated shells that provide inert and high-temperature-resistant steam channels. This study confirms that L-HPC developed using the abovementioned strategy exhibits excellent fire resistance.

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利用空心微球增强轻质高性能水泥基复合材料的耐火性能

火灾对摩天大楼有害无益。将轻质微球和超高性能混凝土粘结剂结合在一起开发的轻质高性能混凝土（L-HPC）在未来的大型基础设施项目中大有可为。本研究调查了使用空心陶瓷微球（HCMs）和空心玻璃微球（HGMs）开发的轻质高性能水泥基复合材料在不同温度下的耐火性能。实验结果表明，加入轻质微球可显著提高 L-HPC 的残余抗压强度，在 900 °C 时，HGMs 和 HCMs 组的残余抗压强度分别保持在 92% 和 78%。此外，这些轻质微球还能有效减轻 L-HPC 的热剥落和裂纹扩展。微结构分析表明，轻质微球有助于蒸汽压力释放。HGM 的熔化实现了孔道中的相互连接，随后通过 HGM 和基质粘结剂的反应加强了孔道。HCM 具有穿孔外壳，可提供惰性和耐高温的蒸汽通道。本研究证实，采用上述策略开发的 L-HPC 具有优异的耐火性能。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.