纤维掺量对高延性纤维混凝土早期收缩的影响及收缩模型研究

Influence of fiber volume fraction on early shrinkage of high ductile fiber reinforced concrete and shrinkage model study

通过非接触式收缩试验研究了纤维掺量对高延性纤维混凝土早期自收缩、干燥收缩发展变化规律的影响。结果表明:随着纤维掺量的增加,高延性纤维混凝土的自收缩与干燥收缩均有不同程度的下降。基于试验结果,在已有高性能混凝土收缩模型基础上提出了适合高延性纤维混凝土的收缩模型,该模型能较好地反映高延性纤维混凝土的早期收缩发展特征,模拟结果与试验结果吻合良好。

Effect of fiber volume fraction on early autogenous and drying shrinkage of high ductile fiber reinforced concrete （HDC） are studied by non-contact type shrinkage test. The results showed that：with the increase of fiber volume fraction,both autogenous and drying shrinkage have certain decreasing tendency respectively. Then the models suitable for HDC are presented based on the test results and existing shrinkage models. The given models can be well used to HDC,and have a good agreement with the test results.