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Utilization of power plants wastes for construction materials production.
Impalpable flour which is appeared in the process of solid-fuel combustion at power plants and collected with electrostatic precipitators is known as Fly ash.
Fly ash (hereinafter — ash) consists of particles of less than 0,14 mm size. Caused by high temperature during solid-fuel combustion silicates, calcium ferrites and aluminates arise. These are hydratable minerals. When mixing with water ash is able to independent hardening and setting. As a rule, such types of ash have free calcium oxide and magnesia.
Our developments allow using fly ash in production of the following construction materials:
1. Blown-out and light concrete (aerated concrete, polystyrene concrete, foamed concrete)
Administration of ash into mix increases agglomeration capacity in the period from beginning to end of cement paste setting. Finely divided proportion assists to dense arrangement of particles in blown-out concrete interpore partition. This technology permits producing material which conforms to GOST’s requirements and also allows consistent cement saving (more than 30%).
2. Heavy concrete
Ash is used for improving properties of heavy concrete. It is applied in manufacturing of both monolithic constructions and built-up concrete and reinforced concrete structures. Ash application allows control structure formation processes; adjust consistency and life of concrete mix; hardening rate and strength.
3. Low cement castable for preparation of auto roads basements
These types are extensively used for roads, airfields and bridges repair, and also for floor construction in industries handling with aggressive environments.
4. Manufacturing of ash binding materials
Ash can be used as cement additive which doesn’t decrease material activity, or as additive to clay when producing bricks and roof tile. Also it is used in manufacturing of special concrete, light porous aggregates, and etc.
Ash utilization efficiency is evaluated by engineering and physical testing.