摘要
为了研究纤维增韧后的高性能混凝土的受力特性,进行了不同纤维种类及添加量、不同混凝土强度等级的单轴抗压试验,分析了高强轻骨料混凝土加荷破坏全过程,对增韧之后轻骨料混凝土的峰值应变、峰值应力变化规律进行研究,结果表明:增韧后的高强轻骨料混凝土与普通混凝土存在明显差异,加入纤维能够很好的减缓试块内部微小裂纹的发展,具有阻止裂缝,增强混凝土韧性的效果,且混凝土强度等级、纤维添加量及种类对其变化影响显著;增韧后的高强轻骨料混凝土试块的应力-应变曲线在下降段表现平缓,轻骨料混凝土中加入纤维使混凝土的强度有所减小,混凝土延展性提升,脆性得以改善,不同种类及掺加量纤维轻骨料混凝土均随混凝土强度等级的提高而提高;利用试验数据验证了新建峰值应力模型、峰值应变的可行性。
In order to study the stress of the fiber toughening of high performance concrete properties,the different fiber type and adding amount,different strength grade of concrete under uniaxial compressive test,the loading damage the whole process of high strength lightweight aggregate concrete,the toughness of lightweight aggregate concrete after the peak strain,peak stress,the results showed that after toughening,there is an obvious difference between high strength and light weight aggregate concrete and ordinary concrete.Adding fiber can well slow down the development of micro-cracks in the test block,prevent cracks,and enhance the toughness of concrete.Besides,concrete strength grade,fiber addition amount and type have a significant influence on the change of concrete.Toughening of high strength lightweight aggregate concrete block after the stress-strain curve gently declining period of performance,light weight aggregate concrete adding fiber reduce intensity of concrete,concrete ductility,brittle improved,different kinds and adding amount of fiber reinforced lightweight aggregate concrete with the increase of concrete strength grade.The feasibility of the new peak stress model and the peak strain is verified by the experimental data.
作者
黄璇
李瑞园
容洪流
HUANG Xuan;LI Ruiyuan;RONV Hongliu(Fuzhou Institute of Technology,Fuzhou 350506,China;College of Civil and Architectural Engineering,Guangxi University,Nanning 530004,China;Key Laboratory of Engineering Disaster Prevention and Structural Safety,Ministry of Education,Guangxi University,Nanning 530004,China;Guangxi Special Geological Highway Safety Engineering Technology Research Center,Guangxi University,Nanning 530004,China)
出处
《混凝土》
CAS
北大核心
2020年第10期5-9,13,共6页
Concrete
基金
福建省中青年教师教育科研项目(JAT170794)
国家自然基金(51268003)。
关键词
纤维
高强轻骨料混凝土
峰值应变
峰值应力
模型
fiber
high strength lightweight aggregate concrete
peak strain
peak stress
model
