钢纤维对超高性能混凝土施工及力学性能的影响研究

为探讨不同钢纤维掺量、长径比及形状对超高性能混凝土的施工及力学性能的影响,首先通过室内试验设计并制备了10组不同钢纤维的超高性能混凝土试件,然后分别对各试件依次进行扩展度、抗压强度及抗折强度测试,得出以下结论:①随着钢纤维掺量的增大,超高性能混凝土的扩展度逐渐减小,抗压强度则逐渐增大,而抗折强度呈先增后减变化;②随着长径比的增大,超高性能混凝土的扩张度逐渐减小,抗压强度和抗折强度则逐渐增大;③钢纤维形状对超高性能混凝土的扩展度、抗折强度和抗折强度均有一定的影响。因此,在工程应用中需根据实际施工需求选择合适的钢纤维掺量、长径比及钢纤维形状。

Study on the Effect of Steel Fiber on the Construction and Mechanical Properties of Ultra-high Performance Concrete

In order to investigate the effects of different steel fiber content,aspect ratio and shape on the construction and mechanical properties of ultra-high performance concrete(UHPC),10 groups of UHPC specimens with different steel fibers were designed and prepared through laboratory tests,and then the expansion degree,compressive strength and bending strength of each specimen were tested respectively.the following conclusions are drawn as follows:①With the increase of the content of the steel fiber,the expansion of the super-high-performance concrete is gradually reduced,and the compressive strength is gradually increased,and the bending strength is firstly increased and then the change is reduced;②with the increase of aspect ratio,the expansion degree of ultra-high performance concrete decreases gradually,while the compressive strength and bending strength increase gradually;③the shape of steel fiber has a certain influence on the extension,bending strength and bending strength of ultra-high performance concrete.Therefore,in engineering applications,it is necessary to select the appropriate steel fiber content,length-to-diameter ratio and steel fiber shape according to the actual construction needs.