使用聚烯和玄武岩纤维的高性能自压混凝土的机械性能和性的比较研究
Piotr Smarzewski1, Anna Jancy1
1Faculty of Civil Engineering and Geodesy, Military University of Technology, 2 Gen. Sylwestra Kaliskiego, 00908 Warsaw, Poland.
Materials (Basel, Switzerland)
|August 28, 2025
概括
这项研究表明,聚烯 (PP) 和玄武岩 (BF) 纤维增强了自压缩混凝土 (SCC) 的机械性能. PP纤维在早期强度和性方面表现出色,而BF纤维则提高了裂后的抗性和能量吸收.
科学领域:
- 材料科学
- 土木工程
- 混凝土技术
背景情况:
- 自压缩混凝土 (SCC) 在放置和巩固方面具有优势.
- 提高SCC的机械性能,特别是高性能混凝土 (HPC),对于结构应用至关重要.
- 纤维增强是改善混凝土性能的一种共同策略.
研究的目的:
- 调查用聚烯 (PP) 和玄武岩 (BF) 纤维增强的SCC的屈曲性能,拉力分裂强度和断裂行为.
- 为了比较PP和BF纤维在不同剂量 (0.025-0.25%) 的SCC性能.
- 了解机械增强和纤维增强HPC的可操作性之间的权衡.
主要方法:
- 用不同的PP和BF纤维类型和体积分数制备了11种SCC混合物.
- 在7日和28日测试了机械性能,包括曲性能,拉力裂变强度和断裂行为.
- 使用统计分析 (ANOVA和Tukey测试) 来验证结果的意义.
主要成果:
- 无论是PP还是BF纤维,都提高了SCC的拉伸和曲性能.
- 聚乙烯纤维在0.125%的剂量下增强了高达45%的裂纹拉伸强度和超过300%的曲性,特别是在早期.
- BF纤维显著增加了28天的性 (高达15.7J) 和裂变后的耐受性,在0.125-0.25%的剂量下具有最佳性能.
- 纤维添加,特别是在较高的含量下,可加工性降低,BF纤维具有更明显的效果.
结论:
- PP和BF纤维为SCC提供了明显的好处,PP在早期的可塑性和BF在高峰后的能量吸收方面表现出色.
- 确定了最佳的纤维剂量:PP为0.05-0.125%,BF为0.125-0.25%.
- 这项研究为选择适合可持续的SCC结构应用的纤维类型和剂量提供了宝贵的见解.
- 建议对混合纤维系统和长期耐用性进行进一步研究.
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