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首页> 外文期刊>Cement and Concrete Research >Assessment of steel fiber corrosion in self-healed ultra-high-performance fiber-reinforced concrete and its effect on tensile performance
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Assessment of steel fiber corrosion in self-healed ultra-high-performance fiber-reinforced concrete and its effect on tensile performance

机译：自愈超高效纤维钢筋混凝土中钢纤维腐蚀的评估及其对拉伸性能的影响

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摘要

This study evaluated steel fiber corrosion and tensile behaviors of plain and self-healed ultra-high-performance fiber-reinforced concrete (UHPFRC) exposed to 3.5% sodium chloride (NaCl) solution. The degree of steel fiber corrosion was quantitatively evaluated via energy dispersive X-ray spectroscopy (EDS) and atomic force microscopy (AFM) image analyses. Test results indicate that, even after a 20-week immersion in the NaCl solution, only few steel fibers located near the surface of the non-cracked UHPFRC samples were slightly corroded, and they insignificantly affected the tensile behavior. A slightly better tensile performance was achieved by self-healing process, and it was further improved after exposure to the NaCl solution for a longer duration due to the moderately corroded steel fibers through the partially self-healed cracks. The surface roughness of the pulled-out steel fibers from the composites increased due to the self-healing and corrosion processes, relevant to the enhanced tensile performance, and by increasing the immersion duration.
机译：本研究评估了钢纤维腐蚀和普通和自愈的超高性能纤维增强混凝土（UHPFRC）暴露于3.5％氯化钠（NaCl）溶液的钢纤维腐蚀和拉伸行为。通过能量分散X射线光谱（EDS）和原子力显微镜（AFM）图像分析定量评估钢纤维腐蚀程度。测试结果表明，即使在NaCl溶液中浸没20周后，位于非破裂的UHPFRC样品的表面附近的少量钢纤维略微腐蚀，并且它们间显着影响拉伸行为。通过自我愈合过程实现了稍微更好的拉伸性能，并且在暴露于NaCl溶液后进一步改善，因为通过部分自愈合的裂缝在适度腐蚀的钢纤维上暴露于持续时间较长的持续时间。由于自愈合和腐蚀过程，与增强的拉伸性能相关，并通过增加浸入持续时间，从复合材料的表面粗糙度增加增加。

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