混凝土早期自收缩与极限拉伸应变的相关性试验

EXPERIMENT ON RELATIONSHIP BETWEEN EARLY AUTOGENOUS SHRINKAGE AND ULTIMATE TENSILE STRAIN OF CONCRETE

通过研究混凝土早期自收缩与相应极限拉伸应变间的关系,对水灰比及砂率对混凝土早期自收缩的影响规律进行分析。研究结果表明,混凝土早期自收缩大小与相应的极限拉伸应变具有显著的二次曲线关系;随着水灰比的降低和砂率的增大,混凝土早期自收缩明显增大。

By studying the relationship between early autogenous shrinkage and ultimate tensile strain of concrete, the influence laws of water-cement ratio and sand percentage on early autogenous shrinkage are analyzed. Research results show that the relationship between autogenous shrinkage at early ages and ultimate tensile strain can be approximately figured by a quadric equation. It is also demonstrated that autogenous shrinkage of concrete at very early ages increases evidently with the decrease of water-cement ratio and the increase of sand percentage.