Slag micropowder is a building material produced by drying, grinding and powder selection of blast furnace slag. The main components of blast furnace slag are silicates and aluminates composed of CaO, MgO, Al2O3, MgO, SiO2, MnO and Fe2O3. SiO2 _ 2 _ 2 and MnO mainly come from gangue and coke ash in ore, while CaO and MgO mainly come from flux. The above four main components account for more than 90% in blast furnace slag. According to iron ore composition, flux quality, coke quality and pig iron types, generally 0.3 ~ 1 .0 tons of waste residue is discharged per ton of pig iron produced, so it is also a kind of industrial waste residue with a large quantity and a wide range.

Slag micropowder is a new type of green building material, which has good environmental protection performance, reduces the cost of concrete, makes full use of blast furnace slag, and can replace the amount of cement in concrete and cement products of various uses in the same amount, obviously improving the comprehensive performance of concrete and cement products. As a new admixture of high performance concrete, slag powder has the advantages of improving various properties of concrete, which are embodied in the following aspects:

1, which can greatly improve the strength of cement concrete and can be used to prepare ultra-high strength cement concrete;

2, it can effectively inhibit the alkali-aggregate reaction of cement concrete, significantly improve the alkali-aggregate reaction resistance of cement concrete, and improve the durability of cement concrete;

3. It can effectively improve the seawater corrosion resistance of cement concrete, and is especially suitable for seawater corrosion resistance projects;

4. It can significantly reduce the bleeding of cement concrete and improve the workability of concrete;

5. It can significantly improve the compactness of cement concrete and improve the impermeability of cement concrete;

6, can significantly reduce the hydration heat of cement concrete, suitable for the configuration of mass concrete.