耐碱玻璃纤维混凝土的抗弯冲击性能研究  

Research on Flexural Impact Behavior of Alkali-Resistance Glass Fibers Reinforced Concrete

作　　者：邓宗才[1] 薛会青[1] 张鹏飞[1] 李朋远[1] 佘向军[1] 张磊[1] 

机构地区：[1]北京工业大学建筑工程学院,北京市100022

出　　处：《公路》2007年第12期184-187,共4页Highway

摘　　要：耐碱玻璃纤维在混凝土中分散性良好，显著改善了混凝土的抗弯冲击性能。由梁弯曲冲击试验发现：当玻璃纤维掺量为1．6～2．7kg／m^3时，纤维掺量2．7kg／m^3（G3）的初裂冲击次数比掺量2．0kg／m^3（G2）和1．6kg／m^3（G1）时分别提高1．97倍和2．81倍，比素混凝土提高10．97倍；G2的初裂冲击次数比G1提高28％，比素混凝土提高3．03倍。G3的破坏冲击次数比G2提高1．95倍，比G1提高2．78倍，比素混凝土提高11．01倍；G2的破坏冲击次数比GJ提高28％，比素混凝土提高3．08倍；G1的破坏冲击次数比素混凝土提高2．18倍。纤维质量掺量由2．0kg／m^3提高到2．7kg／m^3时，对改善混凝土抗弯冲击性能效果十分显著。玻璃纤维显著改善了混凝土的抗弯冲击性能，可以用于机场道面、桥面等工程。The dispersion of alkali-resistance glass fiber is proved to be excellent in concrete, and alkali-resistance glass fibers can remarkably improve the flexural impact performances of concrete. The results of flexural impact experiment of beams indicate that when the alkali-resistance glass fiber content is 1.6-2.7 kg/m^3, the initial-crack impact life of concrete with glass fibers 2, 7 kg/m^3（G3） is 1, 97 and 2.81 times higher than that of 2.0 kg/m^3（G2） and 1.6 kg/m^3（G1） respectively, and 10.97 times higher than that of plain concrete; The initial-crack impact life of G2 is 28% higher than that of G1, and 3.03 times higher than that of plain concrete. The failure impact life of G3 is 1.95 and 2.78 times higher than that of G2, G1 respectively, and 11.01 times higher than that of plain concrete; The failure impact life of G2 is 28% higher than that of G1, and 3.08 times higher than that of plain concrete ; The failure impact life of G1 is 2.18 times higher than that of plain concrete. When fiber content changed from 2.0 kg/m^3 to 2.7 kg/m^3, the flexural impact performance of fiber reinforced concrete is improved significantly. Glass fibers can remarkably improve the flexural impact performances of concrete, and may be used in airport pavement and bridge decks and so on.

关 键 词：耐碱玻璃纤维 纤维混凝土 弯曲冲击 

分 类 号：U414.180.1[交通运输工程—道路与铁道工程]