钢纤维高性能混凝土劈裂强度与变形特性分析

Strength and Deformation Properties of Steel Fiber Reinforced High Performance Concrete under Splitting Process

关键词:  钢纤维  高性能混凝土  劈裂试验  抗拉强度  变形特征  强度特征  韧度

Key words:  steel fiber  high performance concrete  splitting test  tensile strength  deformation property  strength property  toughness

摘要:

对钢纤维掺量（体积分数）为0%，1%，2%，4%的混凝土劈裂强度与变形特性进行了分析.结果表明：4种钢纤维掺量混凝土屈服时拉伸变形量约为012mm，峰值时压缩（拉伸）变形量随着钢纤维掺量增加而增大；钢纤维掺量增加，混凝土的阻裂性能增强，其屈服、峰值抗拉强度明显提高，屈服、峰值前韧度增强，而且对混凝土峰值抗拉强度的贡献明显大于屈服抗拉强度；当钢纤维掺量大于2%时，混凝土不易形成贯通裂纹，基体开裂后，钢纤维继续承受拉应力，其韧性随着钢纤维掺量增加而增大.

Abstract:

The splitting strength and deformation properties of steel fiber high performance concrete with 0%4%（by volume） fiber content were analyzed. Results indicate that the yielding tensile deformation of concrete with 4 kinds of admixture is about 012mm. With the increase of steel fiber content, peak compressive（tensile） deformation increases, cracking resistance of fiber improve, concrete yielding and peak tensile strength increase and toughness of concrete before yield and peak stress enhance. The contribution of steel fiber content on peak tensile strength of concrete is significantly greater than yielding tensile strength. When the steel fiber content is more than 2%, it is difficult for the formation of excurrent cracking. After matrix cracking, steel fiber withstands tensile stress. The toughness of steel fiber reinforced concrete increases with increasing of steel fiber content.