使用聚烯珠提高UHPC拉伸性能:显著的改进和机制
Lang-Kuo Guo1,2, Li-Biao Chen3, Zhi-Wei Chen3
1School of Materials and Engineering, Tongji University, Shanghai 201804, China.
Materials (Basel, Switzerland)
|June 19, 2024
概括
球形聚烯珠通过作为人工缺陷和改善纤维分布来提高超高性能混凝土 (UHPC) 的拉伸性能. 这导致强度和应变能力的显著增加.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 混凝土技术 混凝土技术
背景情况:
- 超高性能混凝土 (UHPC) 具有优越的机械性能,但可以从增强的拉力性能中受益.
- 加入添加剂可以修改混凝土的内部结构和机械行为.
- 了解人工缺陷和光纤定向的作用对于优化UHPC至关重要.
研究的目的:
- 为了研究球形聚乙烯 (PS) 珠子对UHPC的拉伸性能的影响.
- 通过使用X射线计算机断层扫描 (CT) 扫描,阐明观察到的改善背后的机制.
- 为了将纤维方向与UHPC拉伸强度相关联.
主要方法:
- 单轴拉伸试验是在狗骨UHPC标本上进行的,其钉钢纤维体积分数为2%.
- 在UHPC混合物中加入了三种不同剂量的PS珠.
- 使用X射线CT扫描和AVIZO软件分析来检查内部材料结构和纤维方向的测试后.
主要成果:
- 添加PS珠子导致最终抗拉强度增加33.4%,最终抗拉应变增加174.8%.
- CT分析显示PS珠作为人造缺陷,促进矩阵裂.
- PS珠显著优化了纤维的方向,导致纤维分布更加均.
结论:
- 球形聚乙烯珠子有效地提高了UHPC的拉伸性能.
- PS珠通过作为人工缺陷和改善钢纤维分布和方向来增强UHPC.
- 优化纤维定向与增强的UHPC抗拉强度之间存在直接关系.
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