摘要
为了研究纤维增强混凝土梁的抗弯冲击特性 ,利用自制的自由落锤抗弯冲击试验装置 ,测定了不同体积掺率下细直径的腈纶纤维、聚酯纤维、玻璃纤维 ,粗直径的聚丙烯纤维和哑铃形钢纤维增强混凝土梁的抗弯冲击力学性能。试验表明 :纤维增强混凝土梁的冲击次数与纤维品种和体积掺率有关 ;当细直径纤维的体积掺率为0 .0 7%～ 0 .2 7%时 ,纤维增强混凝土梁的初裂、破坏冲击次数分别为素混凝土的 1.1～ 4 .5倍和 1.1～ 4 .4倍 ;当粗直径纤维的体积掺率为 0 .5 %～ 1.4 %时 ,纤维增强混凝土梁的初裂、破坏冲击次数分别为素混凝土梁的 2 .4～ 4 .6倍和 5 .2～ 31.0倍。细纤维增强混凝土梁的初裂冲击性能优于粗纤维增强混凝土梁 。
In order to study the effects of fiber's volume fraction on the flexural impact behavior of concrete beams, a new type of impact equipment is developed and used. The impact behaviors of concrete beams reinforced with polyacrylonitrile fiber(PAN), polyester fiber(PET), glass fiber, crude polypropylene fiber(PP) and dumb-bell steel fiber are investigated. The test results show that the type of fiber and volume fraction affect the flexural impact behavior significantly; the initial-crack and fracture impact cycle number of the fine fiber (PAN, PET, glass fiber) with volume fraction 0.07%～0.27% is 1.1～4.5 and 1.1～4.4 times higher than that of the plain concrete respectively; initial-crack impact cycle number and fracture impact cycle life of concrete beam with crude polypropylene fiber (BarChip fiber)and steel fiber is 2.4～4.6 and 5.2～31.0 times higher than that of the plain concrete beam respectively when fiber's volume fraction is 0.5%～1.4%; the first-crack impact resistance of fine fiber reinforcing concrete beams are more effective than that of crude fiber reinforcing concrete beams, however, the fracture impact resistance of crude polypropylene fiber and steel fiber reinforcing concrete is far more better than that of fine PAN fiber, PET fiber, glass fiber reinforcing concrete.
出处
《公路》
北大核心
2004年第12期163-169,共7页
Highway
