| 高温对钢纤维-聚乙烯醇纤维-CaCO3晶须多尺度纤维/水泥复合材料弯曲性能和微观结构的影响 |
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| 引用本文： | 李黎,李宗利,高丹盈,曹明莉.高温对钢纤维-聚乙烯醇纤维-CaCO3晶须多尺度纤维/水泥复合材料弯曲性能和微观结构的影响[J].复合材料学报,2021,38(7):2326-2335. |
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| 作者姓名： | 李黎 李宗利 高丹盈 曹明莉 |
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| 作者单位： | 1.西北农林科技大学 水利与建筑工程学院 旱区农业水土工程教育部重点实验室，杨凌 712100 |
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| 基金项目： | 中央高校基本科研业务费专项资金(Z109022067)；国家自然科学基金(51678111) |
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| 摘 要： | 为促进钢纤维(SF)-聚乙烯醇(PVA)纤维-CaCO3晶须(CW)多尺度纤维/水泥复合材料的工程应用，考察其抗火耐高温性能，本文研究了SF-PVA-CW多尺度纤维/水泥复合材料高温后的弯曲性能及其微观结构。研究发现:随温度升高，SF-PVA-CW多尺度纤维/水泥复合材料弯曲强度总体下降，但在500℃以下时下降缓慢，CW掺量为3vol%的SF-PVA-CW多尺度纤维/水泥复合材料弯曲强度有所提高；800℃及以上时，SF-PVA-CW多尺度纤维/水泥复合材料的弯曲强度急剧下降。采用JSCE SF4规定的等效弯曲强度评价弯曲韧性。随温度升高，SF-PVA-CW多尺度纤维/水泥复合材料的等效弯曲强度逐渐降低，500℃以下时掺加CW显著增强了SF对裂缝的控制能力，其中小挠度阶段的作用效果优于大挠度阶段。800℃以上时，等效弯曲强度急剧下降，其中大挠度阶段下降更为显著。借助数码相机、光学显微镜和SEM进行多尺度观测，揭示了高温对SF-PVA-CW多尺度纤维/水泥复合材料弯曲性能影响的微观机制。
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| 关 键 词： | 晶须 水泥 纤维/混凝土 高温 弯曲强度 弯曲韧性 微观机制 |
| 收稿时间： | 2020-08-03 |
Influence of high temperature on flexural properties and micro structure of steel fiber-polyvinyl alcohol fiber-CaCO3 whisker multi-scale fibers/cement composite |
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| Affiliation: | 1.Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling 712100, China2.School of Civil Engineering, Zhengzhou University, Zhengzhou 450002, China3.Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | In order to promote the engineering application of steel fiber (SF)-polyvinyl alcohol (PVA) fiber-CaCO3 whisker (CW) multi-scale fibers/cement composite, and investigate its fire resistance and high temperature resistance, the flexural properties and microstructure of the SF-PVA-CW multi-scale fibers/cement composite after high temperature were studied. The results show that with the increase of temperature, the residual flexural strength of the SF-PVA-CW multi-scale fibers/cement composite decreases overall, but decreases slowly below 500℃ and the the SF-PVA-CW multi-scale fibers/cement composite with 3vol% CW still increase. The flexural strength decreases sharply at 800℃ and above. The equivalent flexural strength based on JSCE SF4 was used to evaluate the flexural toughness. With the increase of temperature, the equivalent flexural strength of the SF-PVA-CW multi-scale fibers/cement composite decreases gradually. At the temperature up to 500℃, the addition of CW significantly enhances the crack restricting of SF, and the effect of small deflection stage is better than that of large deflection stage. The equivalent flexural strength decreases sharply at 800℃ or above, especially at large deflection stage. With the help of digital camera, optical microscope and SEM, the micro mechanism of the influence of high temperature on the flexural properties of the SF-PVA-CW multi-scale fibers/cement composite was revealed. |
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