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Fly Ash: Concrete Applications

Fly ash is an extremely fine powder consisting of spherical particles less than 50 microns in size. Fly ash is one of the construction industry's most commonly used pozzolans. Pozzolans are siliceous or siliceous/alumino materials possessing the ability to form cementitious compounds when mixed with lime (calcium hydroxide, or Ca(OH)2,) and water.


When portland cement is mixed with water, most of the cement forms insoluble cementitious compounds; Ca(OH)2 is formed as part of this reaction. When fly ash is introduced into concrete, it reacts with the Ca(OH)2 to form additional cementitious compounds. In a properly proportioned mix, fly ash can improve many of the properties of concrete, including workability and consolidation, flexural and compressive strengths, pumpability, and decreased permeability.


Fly ash provides a significant contribution to sustainable construction. Its use in concrete production consumes less energy and offers improved efficiency and building performance. Fly ash can be used to help achieve LEED (Leadership in Energy and Environmental Design) points.


Product claims are based on proper use in accordance with recognized industry standards. Please contact your Lafarge Cement representative for specific product information, availability, and ordering.

Reflections at Bloomington Central Station, Bloomington, Min

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LafargeHolcim. Cement, aggregates, Concrete.