五河口斜拉桥高性能混凝土长期变形试验研究

Test and Research on Long Term Deformation of High Performace Concrete in Wuhekou Cable-stayed Bridge

五河口斜拉桥主桥和索塔高性能混凝土徐变试验研究,给出了三个配比混凝土的瞬时弹性模量、徐变度、收缩变形和线膨胀系数,依据测试结果提出混凝土的弹性模量、徐变度和徐变系数计算公式。分析认为,混凝土的早期强度和弹性模量相对较高,徐变系数较低,对减少预应力损失和构造物后期变形、加快工程进程都是有利的;测试结果合理可信,计算公式拟合精度高,报告提供的测值及公式可作应用参考。

In this paper the test measurements, analysis methods of creep and the results of testing for the HPC that used in the Wuhekou Cable-stayed Bridge are introduced. By the normal methods, three mixing proportions of concrete, the moment elastic modulus, creep degree, deformation of shrinkage and coefficient of linear expansion are presented. Meanwhile the calculation formulas of the moment elastic modulus, creep degree and coefficient of creep are achieved. The results of experiments indicate when the early strength of concrete is higher and the coefficient of creep is lower, this condition profits to reduce the lose of prestress and long term deformation, as well as to construct quickly. The results of test are reasonable and the calculation formulas are high accurate that provide a useful reference for application.