短切碳纤维混凝土单轴冲击压缩试验与分析  

Uniaxial Impact Compression Tests and Analysis on Short Carbon Fiber Reinforced Concrete

作　　者：刘文勇[1] 袁璞[1] 马冬冬[1] 张阳阳[1] 

机构地区：[1]安徽理工大学 矿山地下工程教育部工程研究中心,淮南232001

出　　处：《混凝土与水泥制品》2014年第5期46-49,共4页China Concrete and Cement Products

基　　金：博士学科点专项基金优先发展领域项目(20133415130001)

摘　　要：为研究短切碳纤维对混凝土动态力学性能的影响,采用覫74mm钢质分离式霍普金森压杆装置,对6种不同体积掺量的短切碳纤维混凝土进行单轴冲击压缩试验。中应变率下的短切碳纤维混凝土动态应力-应变曲线表明,不同体积掺量的短切碳纤维混凝土动态峰值应变大致相同,约为0.0018;由于短切碳纤维的阻裂作用,短切碳纤维混凝土达到峰值应力后仍有一定的承载能力,当轴向动态极限应变超过0.02时,短切碳纤维混凝土的承载力急剧下降。在中应变率加载条件下,短切碳纤维混凝土动态平均抗压强度和碳纤维体积掺量近似服从高斯分布。短切碳纤维混凝土单轴冲击压缩试验表明短切碳纤维合理体积掺量为0.6%。In order to investigate the effect of short carbon fiber on concrete dynamic properties, the steel split Hop- kinson pressure bar with Ф74mm is adopted to conduct uniaxial impact compression tests for short carbon fiber reinforced concrete specimens in 6 kinds of short carbon fiber volume contents. The dynamic stress-strain curve of short carbon fiber reinforced concrete in medium strain rate indicates that the dynamic strain of the concrete specimens in various short carbon fiber volume contents are almost the same and the value is about 0.0018. Due to the crack-resistance effect of short carbon fiber, short carbon fibre reinforced concrete can get a certain bearing capacity after peak stress. When the axial dynamic ultimate strain exceeds 0.02, the bearing capacity of the concrete will decrease sharply. Under medium strain rate loading, the relationship between mean dynamic compressive strength of short carbon fiber reinforced concrete and short carbon fiber volume content approximately obeys gauss distribution. The uniaxial impact compression tests of short carbon fibre reinforced concrete show that the reasonable volume content of short carbon fiber is 0.6%.

关 键 词：碳纤维混凝土 短切碳纤维 碳纤维体积掺量 分离式霍普金森压杆 动态抗压强度 

分 类 号：TU528.572[建筑科学—建筑技术科学]