摘要
选用低弹粗合成纤维、高弹钢纤维,以总体积掺率为1.5%的二元混杂纤维增强混凝土,系统研究了其弯曲韧性、抗弯冲击及断裂性能;用数理统计方法对抗弯冲击强度进行了分析;基于美国A STM及日本JSCE方法,提出了适合评价粗纤维混凝土弯曲韧性的新方法。试验结果充分体现了粗合成纤维与钢纤维良好的协同效应;纤维混杂比例影响混杂纤维混凝土的性能,当粗合成纤维与钢纤维以体积掺率分别为1.0%、0.5%混杂时,纤维混凝土的各项力学性能达到优化,相对剩余强度、冲击延性指标、断裂韧度约分别达到79.6%、7.4、1.2。
In this paper, hybrid fibers including low elastic modulus synthetic macro-fibers, high elastic modulus steel fibers as tow elements are used to been reinforcement in cementitious matrix. The volume fraction is 1.5%. The properties of flexural toughness, flexural impact, and fracture performance are investigated systematically. Flexural impact strength is analyzed with statistic analyses method. Based on ASTM and JSCE method, a new flexural toughness evaluating method suitable for macro-fiber reinforced concrete is first proposed. The results indicate that synergistic effect between synthetic macro-fiber and steel fiber is good. Fiber hybrid proportion has effect on mechanical performance of hybrid fiber reinforced concrete, when volume fractions of synthetic macro-fiber and steel fiber are respectively 1.0 % and 0.5 %, the mechanical properties of HFRC is achieved optimization, relative residual strength, impact toughness index, and fracture toughness are respectively 79.6%, 7.4, and 1.2.
出处
《混凝土》
CAS
CSCD
北大核心
2006年第8期50-55,共6页
Concrete
关键词
混杂纤维
粗合成纤维
钢纤维
剩余强度
抗弯冲击
断裂
混凝土
hybrid fiber
synthetic macro-fiber
steel fiber
residual strength
flexural impact
fracture
concrete