Dynamic compressive behaviour of recycled tyre steel fibre reinforced concrete
Dynamic compressive behaviour of recycled tyre steel fibre reinforced concrete
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DOI：
10.1016/j.conbuildmat.2021.125896
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发表时间：
2021-12-03
影响因子：
7.4
通讯作者：
Zhang, Mingzhong
中科院分区：
文献类型：
--
作者：
Chen, Meng;Si, Hanqing;Zhang, Mingzhong
对再生轮胎钢纤维混凝土的动态压缩性能进行了系统的试验研究。RTSF的使用不仅可以提高胶凝材料的力学性能和耐久性，而且可以减少废弃轮胎对环境的影响。通过一系列试验研究了RTSF掺量（0.5%、0.75%、1.0%和1.25%）对混凝土工作性、含气量和抗压强度的影响，以及在不同冲击速度（35、55、75、95、110和125 s（-1））下的动态抗压性能。为了进行比较，将不含纤维的素混凝土和用1.0%工业钢纤维（ISF）增强的混凝土视为参考混合物。采用分离式霍普金森压杆（SHPB）研究了材料的动态破坏模式、动态抗压强度、动态增加系数（DIF）、能量耗散和增韧机制。结果表明，随着RTSF掺量的增加，混凝土的坍落度减小，含气量增加。在相同的纤维含量（1.0%），RTSF钢筋混凝土表现出更高的工作性和空气含量比ISF钢筋混凝土由于不同的纤维形状和纵横比。随着RTSF掺量从0%增加到0.75%，混凝土在不同应变速率下的抗压强度均呈上升趋势，但随着RTSF掺量从0.75%增加到1.25%，混凝土的抗压强度呈下降趋势。所有混合物的DIF与应变速率密切相关。综合考虑工作性、抗压强度和动态抗压性能，RTSF的最佳掺量为0.75%。
This paper presents a systematic experimental study on dynamic compressive behaviour of recycled tyre steel fibre (RTSF) reinforced concrete. The use of RTSF can not only enhance the mechanical properties and sus-tainability of cementitious materials but also reduce the environmental impact of waste tyres. A series of tests were conducted to investigate the effect of RTSF content (0.5%, 0.75%, 1.0% and 1.25%) on workability, air content and compressive strength of concrete as well as the dynamic compressive behaviour under various impact velocities (35, 55, 75, 95, 110 and 125 s(-1)). For comparisons, plain concrete without fibre and concrete reinforced with 1.0% industrial steel fibre (ISF) were regarded as the reference mixtures. The split Hopkinson pressure bar (SHPB) was adopted to study the dynamic failure pattern, dynamic compressive strength, dynamic increase factor (DIF), energy dissipation and toughening mechanism. Results indicate that with increasing RTSF content, the slump of concrete was reduced while its air content was increased. At the same fibre content (1.0%), RTSF reinforced concrete exhibited a higher workability and air content than ISF reinforced concrete due to the different fibre shape and aspect ratio. The compressive strength of concrete at various strain rates went up with the increase of RTSF content from 0 to 0.75% but reduced with the further increase of RTSF content from 0.75% to 1.25%. DIFs of all mixtures were closely related to strain rate. The optimal dosage of RTSF for concrete was found to be 0.75%, considering workability, compressive strength, and dynamic compressive performance.