嘉鱼大桥宽幅闭合PC箱梁混凝土抗裂性能优化研究

The study on the optimization of anti cracking performance of the wide and closed PC box girder of the Jiayu Bridge

依托嘉鱼长江公路大桥工程建设,针对宽幅闭合PC箱梁混凝土特点,从混凝土配合比设计着手,通过掺加不同掺量及组成比例的矿物掺合料,经过一系列热学、变形及抗裂试验,最终得到了具备高工作性、高抗裂能力及低收缩徐变的最优配合比,显著提高了宽幅闭合PC箱梁混凝土的抗裂性能。

This paper is based on the project construction of Jiayu Yangtze River Highway Bridge. According to the wide and closed PC box girder concrete,different dosage and composition of mineral admixtures of concrete design has been made,after a series of heat transfer,deformation and cracking test,we finally got the optimal with high resistance,high crack resistance,low shrinkage and creep ratio,this result significantly improve the crack resistance of wide and closed PC box girder concrete.