碳纤维增强混凝土基本力学性能及单轴受压本构

关键字：碳纤维,增强混凝土,力学性能,单轴

（山西建筑职业技术学院，山西 太原  030006）

    摘要：通过试验研究了碳纤维体积掺量对混凝土基本力学性能及受压本构关系的影响。结果表明，随碳纤维掺量的增加，混凝土的抗拉、抗折、轴心抗压强度均先提高后降低，峰值应变、极限应变均逐渐增大；碳纤维掺量为0.8%时混凝土的抗拉、抗折强度最高，较未掺碳纤维的分别提高30.6%、19.1%。混凝土受压本构曲线上升段参数a受碳纤维掺量影响较小，但曲线下降段参数b随着碳纤维掺量的增加而逐渐减小，下降段曲线趋于平缓，混凝土延性逐渐增强。
    关键词：碳纤维；混凝土；抗折强度；抗拉强度；本构关系
    中图分类号：TU502        文献标识码：A        文章编号：1001-702X（2017）09-0023-03

Study on basic mechanics and constitutive relation of uniaxial compression of carbon fiber reinforced concrete
MENG Wenhua
（Shanxi Architectural Technical College，Taiyuan 030006，China）

    Abstract：The effect of carbon fiber volume on the basic mechanical properties and compressive constitutive relationship of concrete was investigated by experiments. The test results show that with the increase of carbon fiber content，tensile strength，flexural strength and axial compressive strength of concrete first increase then decrease，the peak strain and ultimate strain of concrete increase gradually. The tensile strength and flexural strength of concrete with 0.8% carbon fiber content reach the highest， increased by 30.6% and 19.1%，respectively. The parameter a of the rising curve of concrete compressive constitutive curve is less affected by the amount of carbon fiber，but the decline curve of b decreases gradually with the increase of carbon fiber content，and the curve of the falling section of concrete tends to be gentle，concrete ductility increases gradually.
    Key words：carbon fiber，concrete，flexural strength，tensile strength，constitutive relation