在3D打印混凝土中使用多巴胺表面修饰的回收PET纤维增强了间层粘附性
Ke-Ke Yu1,2, Tai-Qi Zhao1,2, Qi-Ling Luo1,2
1State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China.
Materials (Basel, Switzerland)
|October 26, 2024
概括
回收PET纤维的多巴胺修饰显著提高了三维打印混凝土 (3DPC) 层间粘附和机械强度. 这种可持续的方法改善了先进建筑材料的纤维矩阵粘合.
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.
- 可持续建筑 可持续建筑
背景情况:
- 三维打印混凝土 (3DPC) 提供了设计灵活性,但其层间粘合力较弱.
- 回收聚乙烯二甲 (PET) 纤维是可持续的钢筋,但与3DPC的接口粘附性很差.
- 增强纤维矩阵结合对于提高3DPC性能至关重要.
研究的目的:
- 研究回收PET纤维的多巴胺修饰,以改善3DPC的界面粘附.
- 评估改性纤维对3DPC层间粘附,压力和强度的影响.
- 探索增强性能背后的微观结构机制.
主要方法:
- 用多巴胺修饰再生PET纤维的表面,以形成多巴胺 (PDA) 层.
- 在不同体积分数 (0.1%,0.3%,0.5%) 的3DPC中加入未经修改和修改的PET纤维.
- 系统评估机械性能 (层间粘附,压力,强度) 和微结构分析 (SEM,XRD).
主要成果:
- 多巴胺修饰产生了PDA膜,增强了纤维表面的粗性和水友性.
- 0.3%体积的多巴胺修饰PET纤维增加了层间粘附率22.5% (与对照组相比) 和14.8% (与未修饰纤维相比).
- 压力和屈曲强度分别增加了22.5%和27.6%,其中0.3体积%的改性纤维.
- 微结构分析证实了纤维矩阵界面粘附的改善.
结论:
- 多巴胺修饰是一种有效的策略,可以增强3DPC中再生PET纤维的界面粘附.
- 改性回收PET纤维显著改善3DPC的机械性能.
- 这项研究促进了回收材料的使用和表面修改,以实现可持续建筑.
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