钢纤维活性粉末混凝土力学特性

Mechanical Properties of RPC with Different Steel Fiber Volume Contents

关键词:  活性粉末混凝土  峰值强度  峰值应变  弹性模量  泊松比  破坏模式  体应变

Key words:  reactive powder concrete（RPC）  peak strength  peak strain  elastic modulus  Poissons ratio  failure mode  volume strain

摘要:

对钢纤维掺量（体积分数，下同）为0%，1%，2%和4%的4种活性粉末混凝土（RPC），在较长龄期（3 a）时进行单轴压缩试验，得到其轴向、径向应力应变全曲线及轴应力体应变曲线，并对以上曲线进行分析.结果表明：钢纤维活性粉末混凝土（SFRPC）峰值强度随钢纤维掺量的增加几乎呈线性增加，当钢纤维掺量为4%时，其圆柱体试件（50×100mm）峰值强度可达218MPa；轴向峰值应变及平均泊松比随钢纤维掺量的增加而增加；钢纤维掺量为0%的素RPC弹性模量最大，钢纤维掺量为1%，2%和4%的SFRPC弹性模量相当；素RPC表现为劈裂破坏，钢纤维掺量为1%的SFRPC表现为单剪切破坏，而钢纤维掺量为4%的SFRPC表现为X形剪切破坏.

Abstract:

Through the uniaxial compressive test on four kinds of reactive powder concretes (RPC) with steel fiber volume contents at 0%,1%,2% and 4% (curing age is three years), the axial direction and radial direction stress strain curves and axial stress volume strain curves of the four kinds of reactive powder concretes were obtained and analyzed in detail. The results show that the peak strength of SFRPC almost linearly increases with the increasing of steel fiber volume contents, the maximum peak strength reach 218MPa at 4% volume content of steel fiber. The peak strain and average Poissons ratio increase with the increasing of steel fiber volume contents.The elastic modulus of plain RPC reaches maximum, when steel fiber volume contents are 1%,2% and 4%, the elastic modulus changes little. Failure model of plain RPC manifested as splitting failure, the failure model of SFRPC with steel fiber volume content at 1% manifested as single shear failure, while steel fiber volume content at 4% manifested as X shear failure.