改性再生混凝土动力性能研究  

Dynamic performance of modified recycled concrete

作　　者：王永贵[1,2] 李帅鹏 Hughes Peter 范玉辉[1] 高向宇[3] WANG Yonggui;LI Shuaipeng;HUGHES Peter;FAN Yuhui;GAO Xiangyu(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Henan Province Engineering Laboratory for Eco-architecture and the Built Environment,Henan Polytechnic University,Jiaozuo 454000,China;College Architecture and Civil Engineering,Beijing University of Technology,Beijing 100122,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]河南理工大学生态建筑与环境构建河南省工程实验室,河南焦作454000 [3]北京工业大学建筑工程学院,北京100122

出　　处：《振动与冲击》2021年第23期269-278,287,共11页Journal of Vibration and Shock

基　　金：国家自然科学基金(51608179);河南省自然科学基金(182300410134,182300410247);河南省科技攻关项目(182102310877);河南省高校基本科研业务费专项资金(NSFRF180418)。

摘　　要：为提高再生混凝土(RC)的力学性能,以玄武岩纤维和纳米氧化硅为增强材料对再生混凝土进行改良,形成玄武岩纤维与纳米氧化硅复合改性再生混凝土,通过静态抗压性能试验及分离式霍普金森压杆(SHPB)试验,研究了玄武岩纤维与纳米氧化硅对改性再生混凝土破坏形态及静动态抗压强度的影响。研究表明:随应变率增大,破坏形态由完整经破裂向粉碎过渡,动态抗压强度、动态增强因子、比能量吸收均呈增大趋势;取代率对试块破坏状态、动态抗压强度及比能量吸收不产生规律性影响,但静态抗压强度随取代率的增大而降低;玄武岩纤维有利于增强试块破坏时的整体性,提高了再生混凝土静态抗压强度、动态抗压强度、峰值应变及比能量吸收;纳米氧化硅有利于提高再生混凝土的静态抗压强度、动态抗压强度、峰值应变及比能量吸收。结果表明,玄武岩纤维与纳米氧化硅对再生混凝土的静动态力学性能及耗能性能具有较好的增强作用。Here,to improve mechanical performance of recycled concrete(RC),recycled concrete was improved with basalt fiber and nano silica as reinforcement to form a composite modified recycled concrete with basalt fiber and nano silica.Through static compressive performance tests and split Hopkinson pressure bar tests(SHPB),effects of basalt fiber and nano silica on failure mode and static and dynamic compressive strength of modified recycled concrete were studied.The results showed that with increase in strain rate,failure mode transits from complete,fracture to crushing,and dynamic compressive strength,dynamic enhancement factor and specific energy absorption all increase;the replacement rate has no regular effects on failure mode,dynamic compressive strength and specific energy absorption of test block,but static compressive strength decreases with increase in replacement rate;basalt fiber is beneficial to enhance the integrity of test block during failure to improve static compressive strength,dynamic compressive strength,peak strain and specific energy absorption of recycled concrete;nano silica is beneficial to improve static compressive strength,dynamic compressive strength,peak strain and specific energy absorption of recycled concrete;so,basalt fiber and nano silica can enhance static and dynamic mechanical performances and energy dissipation performance of recycled concrete.

关 键 词：玄武岩纤维 纳米氧化硅 再生混凝土(RC) 霍普金森压杆(SHPB) 动态抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]