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硅粉在混凝土中的应用始于七十年代挪威、丹麦等国,试验发现在混凝土中掺加硅粉,可改善新拌混凝土的稠度,减少材料的离析,增加混凝土强度,提高水密性,耐久性等,因而受到其它国家的重视并相继进行研究。硅粉是生产硅铁合金的一种副产品,是在冶炼时从烟气中经收尘后得到的超细颗粒,一般呈灰色,比重约为水泥的2/3,比表面为水泥的40～100倍,平均粒径为0.1um.SiO_2含量在90%以上。
The application of silica fume in concrete began in the seventies Norway, Denmark and other countries. It was found that adding silica fume to concrete can improve the consistency of fresh concrete, reduce the segregation of materials, increase the strength of concrete, improve the water tightness and durability Sex, etc., which have received the attention of other countries and have conducted research. Silica fume is a by-product of the production of ferrosilicon alloy, is obtained in the smelting flue gas obtained after the ultrafine particles, generally gray, the proportion of about 2/3 of the cement, the specific surface of the cement 40 to 100 Times, the average particle size of 0.1um.SiO_2 content above 90%.