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硅粉可以提高混凝土的强度,减少泌水,改善稠度、不透水性和耐久性等性能。因此,近年来发达国家纷纷开展了利用硅粉作混凝土改性材料的研究工作。硅粉在混凝土中应用的范围越来越广,数量越来越大。随着应用的推广和硅粉对改进混凝土性能的作用日益为人们所认识,各国的硅粉产量也不断增加,目前全世界的年产量已超过110万吨。一、硅粉的物理性质及化学成分硅粉是从生产硅铁和其他硅金属的工厂排出的废气中回收到的一种副产品,是非品质、平均粒径0.1μm 左右的球形微粒,其颜色为浅灰色或深灰色,加水搅拌后成黑色。硅粉的比重
Silicon powder can improve the strength of concrete, reduce bleeding, improve the consistency, impermeability and durability and other properties. Therefore, in recent years, developed countries have carried out research on the use of silicon powder as concrete modification material. The application of silica fume in concrete has become more and more widespread and the number is increasing. With the promotion of application and the role of silica fume in improving the performance of concrete, people are increasingly aware of the fact that the production of silicon powder in various countries is also increasing, and the current annual output of the world has exceeded 1.1 million tons. 1. Physical Properties and Chemical Composition of Silica Fume Silica fume is a by-product recovered from waste gas discharged from factories producing ferrosilicon and other silicon metals. It is a non-quality spherical particle with an average particle size of about 0.1 μm. Its color is Light gray or dark gray, add water and stir into black. The proportion of silicon powder