纳米SiO_2桥梁混凝土抗盐冻剥蚀性能试验研究

A study of iced-scaling resistance to sulfates of bridge building concrete mixed nano SiO_2

寒冷地区桥梁混凝土由于除冰盐的使用使得引起的盐冻剥蚀破坏,导致混凝土结构提前丧失使用功能。将纳米SiO_2加入到桥梁混凝土中进行抗盐冻性能试验研究,结果表明:由于纳米微粉与纳米级水化C-S-H凝胶大量键合,把松散的水化硅酸钙凝胶变成纳米微粉为核心的网状结构,使得混凝土更加密实,掺加一定量的纳米SiO_2混凝土较空白混凝土抗盐冻剥蚀性能有较大地提高。

During winters in cold regions,bridge building concrete will suffer iced scaling of sulfates caused by deicing stuffs using,which makes life of concrete structures shorter than normal.When nano-SiO_2 is mixed in bridge building concrete,as nano-powder and gel of nano-grade hydrated C-S-H bonds together,this turns hydrated calcium silicate gel to structure nets connected and cored with powders,which makes the concrete more density,so concrete mixed with nano-SiO_2 will be of higher on freezing resistance to normal concrete.