关于碳纳米管修改的飞灰泡混凝土填充剂的分裂拉力故障的实验研究
Shukun Zhang1, Xinghui Wu2, Peng Jiang1
1School of City and Architecture Engineering, Zaozhuang University, Zaozhuang, 277160, Shandong, China.
Scientific reports
|January 14, 2025
概括
添加碳纳米管 (CNTs) 显著增强了泡混凝土后填充的分裂拉伸性能. 这种修改提高了强度和应变,CNTs优化了结构完整性和负载下的能量消耗.
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.
- 纳米技术 纳米技术
背景情况:
- 使用水泥,飞灰和天然沙子填充泡混凝土在建筑中至关重要.
- 提高这种填充的机械性能,特别是抗拉强度,对于结构完整性至关重要.
- 碳纳米管 (CNTs) 提供了加强水泥材料的潜力.
研究的目的:
- 为了研究碳纳米管 (CNTs) 对泡混凝土后填充物分裂拉伸性能的增强效应.
- 分析CNT对压力-应变行为,裂传播和能量消散的影响.
- 在CNT改性泡混凝土中建立分裂拉伸强度,最终应变和加载率之间的关系.
主要方法:
- 准备CNT修改的泡混凝土回填样本.
- 巴西分裂试验,以确定分裂的拉伸强度.
- 数字斑点相关联方法用于分析应力场和裂纹模式.
- 在各种静态负载速率下研究应力-张力特征和能量消散.
主要成果:
- 最佳CNT含量为0.05%,导致峰值强度平均增加67.2%,最终应变增加21.7%.
- CNTs在峰值强度之前减少了应变度区域,并影响了应力-应变曲线的"反击"效应.
- 峰值强度与负载率呈现出对数相关性,而最终应变则遵循功率函数.
- 能量消耗随着装载速度而变化:在低速率下,能量消耗较少,而在高速率下,更多的能量消耗在CNT修改后补充中变化.
结论:
- 碳纳米管有效地增强了泡混凝土回填的分裂抗拉强度和最终应变.
- CNTs提高了回填材料的结构稳定性和抗裂性能.
- CNT修饰泡混凝土的机械行为和能量消耗取决于加载率.
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