Steel Fiber to Improve Thermal Resistance of High Strength PVA-ECC after Exposure to Elevated Temperature

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2023-09-20 DOI:10.3151/jact.21.748
Yuxuan Zhou, Qing Wang, Mianheng Lai, Johnny Ching Ming Ho
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Abstract

The use of engineered cementitious composite with polyvinyl alcohol fiber has shown excellent potential in building facilities due to its strain-hardening and multiple-cracking features. However, when polyvinyl alcohol fiber melts at around 230°C, spalling behavior of engineered cementitious composite may occur, weakening the mechanical properties and reducing ductility of high strength engineered cementitious composite. Thus, investigating the fire resistance is of great significance. By adding steel fibers to cementitious composites, qualitative and quantitative comparisons were done through observing appearance changes, spalling extent, surface cracking, mass loss, and residual mechanical properties. Results indicate that steel fiber can increase the risk of spalling and surface cracking in high strength engineered cementitious composite, improve residual mechanical abilities also. The ductility varies with steel fiber content at different elevated temperatures. Scanning electron microscopy results show that more hydration products are produced on the surface of steel fiber at 400°C, which improves interface transition zones between fiber and cementitious materials. However, an oxidation film found on the surface of steel fiber at 800°C triggers negative effect on bridging.
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钢纤维提高高强度PVA-ECC高温耐热性能的研究
聚乙烯醇纤维工程胶凝复合材料具有应变硬化和多次开裂的特点,在建筑设施中具有良好的应用前景。然而,当聚乙烯醇纤维在230℃左右熔化时,工程胶凝复合材料可能出现剥落行为,使高强工程胶凝复合材料的力学性能变弱,延性降低。因此,研究其耐火性能具有重要意义。将钢纤维加入胶凝复合材料中,通过观察其外观变化、剥落程度、表面开裂、质量损失和残余力学性能进行定性和定量比较。结果表明,钢纤维可增加高强工程胶凝复合材料的剥落和表面开裂风险,提高其残余力学性能。在不同的高温条件下,钢纤维的掺量不同,其延展性也不同。扫描电镜结果表明,在400℃时,钢纤维表面产生了更多的水化产物,改善了纤维与胶凝材料之间的界面过渡区。然而,在800℃时,钢纤维表面的氧化膜对桥接产生负面影响。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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