桥用高性能混凝土长期耐久性试验研究

滨州黄河大桥主桥是三塔预应力混凝土斜拉桥,桥塔采用C55高性能混凝土。在混凝土中掺加粉煤灰等活性掺和料,配制不同配合比的C55高性能混凝土,并对可能采用的C55高性能混凝土的长期耐久性、混凝土收缩、抗渗、碳化和钢筋锈蚀以及混凝土的抗氯盐侵蚀和抗硫酸盐侵蚀性能进行了试验研究。结果表明,掺加活性掺合料有助于提高混凝土的长期耐久性。

Experimental Research on Durability of High Performance Concrete for Bridge

Binzhou Yellow River Bridge,which is a three-tower prestressed concrete cable-stayed bridge,applies the C55 concrete in the towers.C55 high performance concrete of different mix proportion could be produced by adding active supplementary material such as flyash into it.A series of experiment,such as shrinkage,anti-infiltration,carbonation,steel corrosion,are carried out to ensure durability of concrete.Complementary experiment,such as chloride and sulphate diffusion,is also carried through for the concrete.The durability of concrete is enhanced by using of active supplementary material.