钢纤维掺量及规格对桥梁用超高性能混凝土性能影响的研究

为了探究钢纤维掺量及规格对桥梁用超高性能混凝土施工性能和力学性能的影响,通过设置不同钢纤维掺量(0％、0.5％、1％、1.5％、2％、2.5％、3％、3.5％、4％)和长径比(65、80、90、100)进行对照试验,分别得到试件的扩展度、抗压强度、抗折强度.试验结果表明:当钢纤维长径比为65时,随着掺量的增加,超高性能...

Study on the Influence of Steel Fiber Content and Specification on the Performance of Ultra High Performance Concrete for Bridge

In order to explore the influence of steel fiber content and specification on the construction performance and mechanical properties of ultra-high performance concrete for bridge,this paper carried out comparative test by setting different steel fiber content(0%,0.5%,1%,1.5%,2%,2.5%,3%,3.5%,4%)and aspect ratio(65,80,90,100),respectively Flexural strength.The test results show that:when the aspect ratio of steel fiber is 65,the expansion degree of ultra-high performance concrete decreases,the compressive strength increases,and the flexural strength first increases and then decreases.The maximum compressive strength and flexural strength are 166.84 and 43.74 MPa respectively,and the corresponding steel fiber content is 4%and 3.5%respectively.When the steel fiber is 2.5%,with the increase of length diameter ratio,the expansion degree of UHPC decreases,the compressive strength and flexural strength increase,and the maximum compressive strength and flexural strength are 164.89 and 42.05 MPa respectively.On the premise of meeting the working performance of ultra-high performance concrete for bridge,the length diameter ratio of steel fiber should be properly increased to reduce the occurrence of bridge structural cracks and improve the durability.