混合钢纤维对快硬自密实混凝土弯曲协同效能研究

Research of Hybrid Steel Fiber on Flexural Properties and Cooperative Energy of Rapid Hardening Self-compacting Concrete

参照ASTMC 1609和JSCE SF-4评价方法,研究了混合端钩钢纤维和直钢纤维增强快硬自密实混凝土的弯曲性能。与同等掺量的单掺钢纤维相比,掺入混合钢纤维,可显著改善混凝土的力学性能,提高混凝土的弯曲韧性和抗弯强度。推导的混合钢纤维混凝土的抗弯强度公式,可用于调整端钩钢纤维和直钢纤维的掺量。比较混掺不同掺量的钢纤维混凝土的协同效能表明,掺0.3%直钢纤维和0.5%端钩钢纤维的协同效能最好。

Flexural behavior of hybrid hooked-end steel fiber and straight steel fiber reinforced rapid hardening self compacting concrete is investigated by evaluation method of ASTMC 1609 and JSCE SF-4. Compared with same amount of single doped steel fiber, mechanical properties of concrete can be improved significantly by adding hybrid steel fiber, which can also enhance flexural toughness and flexural strength of concrete. Volume of hooked-end steel fiber and straight steel fiber is adjusted by flexural strength formula of hybrid steel fiber reinforced concrete. Compared with cooperative en- ergy of steel fiber reinforced concrete with different dosage, cooperative energy of adding 0.3% straight steel fiber and 0.5% hooked-end steel fiber is the best.