氧化铝纤维增强混凝土力学性能试验研究
Experimental study on mechanical properties of alumina fiber reinforced concrete
王伟涛 1洪刚 2贺盛文 3夏伟4
作者信息
- 1. 中铁第一勘察设计院集团有限公司,陕西 西安 710043
- 2. 云南建投第四建设有限公司,陕西 西安 710082;西安市浐灞生态区空工机场工程技术咨询部,陕西 西安 710051
- 3. 云南建投第四建设有限公司,陕西 西安 710082
- 4. 空军工程大学航空工程学院,陕西 西安 710038
- 折叠
摘要
为探究氧化铝纤维对混凝土力学性能的影响,制作了不同氧化铝纤维长度(4 mm、8 mm、12 mm、16 mm)及体积掺量(0.1%、0.2%、0.3%、0.4%、0.5%)的氧化铝纤维增强混凝土试件,并且分别对其开展了抗压及抗折性能测试.结果表明,随着氧化铝纤维体积掺量的增加,混凝土的抗压强度和抗折强度均呈现出先逐渐增加而后有所下降的变化趋势;掺入长度为 8mm的氧化铝纤维比另外 3 种长度的氧化铝纤维对于混凝土抗压、抗折强度的提升作用更加明显.当氧化铝纤维长度为 8 mm、体积掺量为0.2%时,氧化铝纤维增强混凝土的抗压强度相较于素混凝土提高了10.59%;当氧化铝纤维长度为8 mm、体积掺量为0.3%时,氧化铝纤维增强混凝土的抗折强度相较于素混凝土提高了 26.18%.通过微观形貌分析可知,氧化铝纤维能够与混凝土基体紧密结合,充分发挥阻裂作用、桥接作用,进而有效改善混凝土材料的基本力学性能.
Abstract
In order to explore the influence of alumina fibers on the mechanical properties of concrete,alumina fiber reinforced concrete specimens with different lengths(4 mm,8 mm,12 mm,16 mm)and different volume additions(0.1%,0.2%,0.3%,0.4%,0.5%)of alumina fibers are manufactured,and their compressive and flexural properties are tested respectively.Study results indicate that with the increase of alumina fiber dosage,the compressive strength and flexural strength of concrete show a trend of gradually increasing firstly and decreasing then.In general,the addition of alumina fibers with a length of 8 mm has a more significant effect on improving the compressive and flexural strength of concrete than the addition of alumina fibers with other three lengths.The compressive strength of alumina fiber reinforced concrete when alumina fiber with a length of 8 mm is added in a volume content of 0.2%is 10.59%higher than that of plain concrete.The flexural strength of alumina fiber reinforced concrete when alumina fiber with a length of 8 mm is added in a volume content of 0.3%is 26.18%higher than that of plain concrete.Through microscopic morphology analysis,it can be concluded that alumina fibers can closely bond with concrete matrix,fully exert their crack resistance and bridging effects,and effectively improve the basic mechanical properties of concrete materials.
关键词
混凝土/氧化铝纤维/抗压强度/抗折强度/折压比/微观形貌Key words
concrete/alumina fiber/compressive strength/flexural strength/flexural compression ratio/microstructural morphology引用本文复制引用
出版年
2024
NETL
NSTL
万方数据