Fly ash is a fine-grained construction material consisting mainly of dust-like, glassy particles. It is produced as a by-product of power and heat generation from hard coal in power plants.
The main constituents of fly ash are the amorphous phases of silicon oxide, aluminum oxide, and iron oxide formed from the natural minerals that come with the coal. Fly ash has been a certified binder component for many decades now. As the main constituent in cement and as a concrete additive, it contributes very positively to protecting the environment and conserving natural resources.
Reduce CO2 with fly ash
As a mineral by-product, fly ash – with its very low carbon footprint – contributes to cutting CO2 emissions in both cement and concrete production.
Fly ash is a particulate material that is light to dark gray in color. In terms of its chemical composition, fly ash corresponds to naturally occurring aluminosilicates, for example volcanic ashes and earths. Its particle shape and particle size distribution as well as the pozzolanic properties make fly ash a sought-after building material.
The round particles of fly ash act like small ball bearings in the concrete and reduce the amount of water required. The concrete is easier to work and, in the case of shotcrete and high performance concrete, can be better compacted.
Particle size distribution
The fine fly ash particles settle between the coarser cement particles and the aggregate, thereby reducing the void content of the concrete. The fewer voids in the concrete, the greater its strength.
Fly ash reacts with water and calcium hydroxide to form insoluble calcium silicate hydrates (CSH phases). In concrete, these CSH phases not only increase strength but also compact the pore structure..
Regular third-party inspection by officially approved testing institutes and in-house monitoring in a construction materials laboratory guarantee the consistently high quality of the fly ash.
Fields of application
Fly ash can be put to many different uses. One major field of application is using fly ash as an additive in concrete, where applications range from unreinforced concrete products, ready-mixed concretes, and precast concrete parts to special concretes.
Fly ash is also recognized as a high-quality construction material in its capacity as the main constituent of cement according to DIN EN 197-1. The European Union’s European Green Deal calls on the cement industry to consistently optimize clinker and cement in order to contribute to achieving these climate protection targets. Composite cements with fly ash play an important role in this context.
“We use fly ash because...”
Überseequartier sets new standards
The Westfield Hamburg-Überseequartier lies at the heart of Hamburg’s HafenCity. EP Power Minerals fly ash plays a key role in the mega-project.
“By optimizing the concrete formulas and selecting the right suppliers, we can produce a concrete that meets the high demands of the project!”
Head of Mobile Projects at KBK - Kies Beton Krebs GmbH & Co. KG
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