硅酸盐通报2024，Vol.43Issue(11)：4004-4011,8.
多尺度碳纤维改性混凝土的力学性能及抗冻性
Mechanical Properties and Frost Resistance of Multi-Scale Carbon Fiber Modified Concrete
摘要
Abstract
Carbon nanofibers(CNFs)and carbon fibers(CFs)are nanoscale and micrometer carbon-based fibers,respectively.By mixing them into concrete,one kind of carbon nanofibers modified concrete(CNFsMC,the volume content of CNFs is0.3%)and four kinds of multi-scale carbon fibers modified concrete(MCFsMC,the volume content of CNFs is fixed at 0.3%,and the volume content of CFs is 0.05%,0.10%,0.15%,0.20%,respectively).The effect of multi-scale carbon-based fibers on mechanical properties and frost resistance of concrete were studied,and the modification mechanism of multi-scale carbon-based fibers on concrete was analyzed.The results show that the mechanical properties and frost resistance of concrete can be further improved by adding appropriate content of CFs on the basis of 0.3%CNFs.When the content of CFs is 0.1%,the mechanical properties and frost resistance of MCFsMC are the best,and the total porosity and average pore size before and after freeze-thaw cycle are the minimum.And the compressive strength,flexural strength,flexural-compressive strength ratio and splitting tensile strength of MCFsMC increase by 13.93%,25.08%,9.83%and 20.15%,respectively,compared with CNFsMC.After 200 freeze-thaw cycles,the mass loss rate of MCFsMC is only0.95%,the relative dynamic elastic modulus is 89.2%,and the strength loss rate is less than 14%.CNFs and CFs have positive hybrid effect,and they can complement each other,construct multi-scale crack resistance network and effectively play an effect on cracks with different sizes,and double enhance the mechanical properties and frost resistance of concrete.关键词
混凝土/纳米碳纤维/碳纤维/多尺度/力学性能/抗冻性Key words
concrete/carbon nanofiber/carbon fiber/multi-scale/mechanical property/frost resistance分类
建筑与水利引用本文复制引用
方莹,文祝..多尺度碳纤维改性混凝土的力学性能及抗冻性[J].硅酸盐通报,2024,43(11):4004-4011,8.基金项目
四川省电教化管项目(KT202009303CE8053) （KT202009303CE8053）
宜宾职业技术学院院级科研项目(ZRKY21ZDXM-02,YBZY20CXTD02) （ZRKY21ZDXM-02,YBZY20CXTD02）
