碳纤维混凝土动态压缩力学性能的试验研究

Experimental study on dynamic compressive testing and mechanical properties of carbon fiber-reinforced concrete

采用φ100 mm分离式霍普金森压杆(SHPB)试验装置,研究了不同体积掺量(Vcf)的碳纤维混凝土(CFRC),在多个应变率条件下的动态压缩力学性能,得到了应力-应变曲线。结果表明,CFRC的强度随应变率的增加而近似呈线性增长,纤维体积掺量为0.3%碳纤维混凝土变形能力较好。分析了试件的加载波形图和应变率时程曲线,试验中近似恒应变率加载时间比例大于50.2%。在相同应变率范围内,CFRC的破坏程度与素混凝土相比较轻,说明碳纤维的加入增强了混凝土的抗冲击性能。

Dynamic mechanical properties of concrete reinforced with different volumetric fractions of carbon fiber （ CF ） subjected to various high strain rates were studied, and gained the stress versus strain curves of concrete specimens reinforced with different volumetric fractions of CF. Details of an experimental investigation using 100 mm-diameter split Hopkinson pressure bar （ SHPB ） apparatus were presented.The results show that the relationship between dynamic compressive strength of carbon fiber-reinforced concrete（CFRC） and the strain rate can be expressed by linear approximations.The deformation performance of 0.3% volumetric fraction CFRC is better.The analysis of loading wave and strain rate history curves of specimens educes that the proportion of approximate constant strain rate loading time is more than 50.2% .With the same strain rate, the collapse state of CFRC is slighter than that of plain concrete ,which shows that CF reinforce the dynamic impact mechanical properties of concrete.