增强纤维对全风积沙超高性能混凝土收缩性能的影响

Effect of Reinforced Fiber on Shrinkage Performance of Ultra-High Performance Concrete with Aeolian Sand

早期自收缩是影响超高性能混凝土体积稳定性的重要因素,特别是由粒径较小的风积沙作为骨料的全风积沙超高性能混凝土。试验采用建筑中常用的三种增强纤维,探索纤维种类与掺量对全风积沙超高性能混凝土早期自收缩的抑制规律。通过试验发现,三种纤维对全风积沙超高性能混凝土早期自收缩抑制效果由大到小依次为:PVA纤维>玄武岩纤维>钢纤维,在一定范围内,纤维的掺量越高,对全风积沙超高性能混凝土早期自收缩抑制效果越好。这一结论为探索增强纤维对全风积沙超高性能混凝土自收缩性能影响的规律提供了参考。

It is an important factor of autogenous shrinkage, which affecting the volume stability of UHPC,for small size aeolian sand as aggregate. Three kinds of reinforced fibers commonly used in buildings were used in the experiment to explore the autogenous shrinkage restraint law of UHPC with full aeolian sand.The experimental results show that the effect of three kinds of fibers on autogenous shrinkage of UHPC with total aeolian sand is in the order of PVA fibers > basalt fibers > steel fibers. Within a certain range, the higher the content of fibers, the better the effect on autogenous shrinkage of UHPC with full aeolian sand. It provides a reference for exploring the influence of reinforced fibers on the autogenous shrinkage of UHPC with aeolian sand.