五河口斜拉桥主梁高性能混凝土试验研究

针对五河口斜拉桥箱梁,重点研究了粉煤灰、粉煤灰和硅粉复掺、纤维对高性能混凝土物理力学性能和耐久性能的影响。试验研究结果表明,采用粉煤灰和高效减水剂的双掺技术,配制的C 60高性能混凝土具有良好的工作性能、力学性能和耐久性能,尤其是具有较小的干缩变形,能满足工程进度要求的3 d张拉预应力束和大体积混凝土的温控要求,高性能混凝土在五河口斜拉桥箱梁上得到了成功应用。

Test and Research on High Performance Concrete for Main Girder of Wuhekou Cable-stayed Bridge

To Counter the PC concrete box girder of Wuhekou Cable-stayed Bridge,the effect of mixing fly ash,compositely mixing fly ash and silicon powder or fibers addition on physical mechanic performance and durability of high performance concrete(HPC) are researched mainly.The results of researches show that the C60 HPC adopting composite mixing fly ash and superplasticizer techniques has good workability,advanced mechanisms performance,and durability,especially its less dry shrinkage.All these characteristics can meet the requirements for the project progress,such as the prestressed tension within 3 days and the temperature control for a large volume concrete cast.The C60 HPC are successfully applied to the box girder in the Wuhekou Cable-stayed Bridge.