Alkaline reaction powder concretes
Current state of construction science causes during the construction of unique buildings, and construction of complex structures and their repair, high-strength binders and concretes based on them. High-strength concrete appeared in foreign practice in the early 60-ies different countries on an industrial scale started using concrete strength greater than 40 MPa.Particularly promising obtained at the end of the 80-ies of the twentieth century, the so-called reactive powder concrete - Reactive powder concretes (RPC). Concrete powder as reaction components due to the high dispersity and increased amounts of hydraulically active materials.At the same time, there exists a long form as slag-alkaline cementations binder, the activity of which, even without the use of special techniques used to improve the strength portland cement concrete, described above, up to 80 MPa. Fixed effect of the interaction between sodium silicate and iron salts and the resulting so-called slag slurry binder is a mixture of granulated blast furnace slag waste mining and processing (iron-bearing mineral complex), mixed with water.These two positions were the basis for a new type of concrete, a so-called slag-alkaline reactive powder concrete, which is a mixture of granulated blast furnace slag to iron- mineral complex, mixing an aqueous solution of the alkaline component with the addition of a polyalcohol. This type of binder has a compressive strength reaching 110 MPa.