为解决水工建筑物面临的冲蚀问题,试验研究了在不同养护龄期下,不同体积掺量PVA纤维对混凝土强度、抗冲磨性能的影响,并对纤维混凝土的微观形貌进行了分析。研究结果表明,同基准组混凝土相比,当PVA纤维体积掺量为0.2%时,纤维混凝土的抗压强度提升了20.8%,劈裂抗拉强度提升了33.2%,抗冲磨强度提升了108.4%,磨损深度下降了34.2%,质量磨损率下降了3.9%。PVA纤维混凝土微观形貌的分析结果显示,当PVA纤维体积掺量为0.2%时,纤维在混凝土基体内分散性良好且呈乱向分布。结合SEM分析结果得知,在混凝土中掺入适量PVA纤维,可以显著提升水工混凝土的强度和抗冲磨性。
Abstract
In order to improve the abrasion resistance of hydraulic structures, we investigated into the influence of volumetric content of PVA fiber on the strength and abrasion resistance of hydraulic concrete at different curing ages, and also analyzed the micro-morphology of PVA fiber-added concretes. Compared with baseline group, the concrete samples added with 0.2% PVA fiber in volumetric content boasts larger compressive strength, splitting tensile strength, and abrasion resistance strength, up by 20.8%, 33.2%, and 108.4%, respectively, yet meanwhile smaller wearing depth and mass wear rate, down by 34.2% and 3.9%, respectively. Micro-morphology analysis reveal that the PVA fiber is well dispersed in the concrete matrix and distributed in random directions when its volumetric content is 0.2%. In association with SEM analysis, we can conclude that PVA fiber of suitable dosage would enhance the strength and abrasion resistance of hydraulic concrete remarkably.
关键词
水工混凝土 /
PVA纤维 /
体积掺量 /
抗冲磨性 /
劈裂抗拉强度 /
微观形貌
Key words
hydraulic concrete /
PVA fiber /
volumetric content /
abrasion resistance /
splitting tensile strength /
micro-morphology
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基金
云南省教育厅科学研究基金项目(2020J0242,2020Y188);云南农业大学科技创新创业行动基金项目(2021ZKX186)
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