纤维增强高强珊瑚混凝土力学性能试验研究  

Experimental Study on Mechanical Properties of Fiber-Reinforced High-Strength Coral Concrete

作　　者：魏彬 韦彩旗 易金[1,2] WEI Bin;WEI Caiqi;YI Jin(School of Civil and Architectural Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西建筑新能源与节能重点实验室,广西桂林541004

出　　处：《安徽建筑大学学报》2023年第5期60-67,共8页Journal of Anhui Jianzhu University

基　　金：广西创新驱动发展专项资金项目(桂科AA18242007);广西建筑新能源与节能重点实验室基金项目(桂科能22-J-21-15)。

摘　　要：增强、增韧是解决珊瑚混凝土自身强度低、脆性大等缺陷的重要途径。以小粒径的珊瑚砂完全替代珊瑚粗骨料制备高强珊瑚混凝土(High Strength Coral Concrete,HSCC),研究不同纤维类型和掺量对高强珊瑚混凝土孔隙率、强度影响机理、受压破坏特征及微观结构的影响。结果表明:不同掺量纤维对HSCC孔隙率有一定的影响,并呈先降低后升高的趋势,变化幅度为-38.5%~17.3%;纤维一定程度上提高了HSCC的抗压强度,但对轴心抗压强度的提升较小,当纤维掺量为3 kg/m3时,碳纤维和聚丙烯纤维的HSCC试件抗压强度分别提高10.2%和6.1%;当纤维掺量为4 kg/m3时,HSCC折压比显著提高,碳纤维和聚丙烯纤维试件的折压比分别提升了10.3%和21.6%。Reinforcement and toughening are important ways to solve the defects of coral concrete such as low strength and large brittleness.High Strength Coral Concrete(HSCC)was prepared by completely replacing coral coarse aggregate with coral sand with small particle size,and the effects of different fiber types and dosage on porosity,strength influence mechanism,failure characteristics and microstructure of HSCC were studied.The results show that different amounts of fibers have a certain influence on the porosity of HSCC,and show a tendency to decrease first and then increase,with a change of-38.5%to 17.3%.The fibers imporved the compressive strength of the HSCC to some extent,while the enhancement of the axial compressive strength is small.When the fiber dosage is 3 kg/m3,the compressive strength of the HSCC specimen with carbon fiber and polypropylene fiber is increased by 10.2%and 6.1%,respectively.When the fiber content was 4 kg/m3,the folding ratio of HSCC was significantly improved,and the folding ratio of carbon fiber and polypropylene fiber specimens increased by 10.3%and 21.6%,respectively.

关 键 词：高强珊瑚混凝土 纤维 孔隙率 抗压强度 

分 类 号：TU528.58[建筑科学—建筑技术科学]