Mineral admixtures (e.g. fly ash, silica fume, volcanic ash, etc.) impart beneficial properties to fresh and hardened concrete. They are used to make mixtures more economical, increase strength, reduce permeability, and to improve other properties of concrete. For example, fly ash tends to improve the workability of fresh concrete and the compressive strength of hardened concrete.
The pozzolanic reactivity of mineral admixtures can drastically affect the nature of hardened concrete. The silica component of the mineral admixture reacts with the calcium hydroxide (also knows as Porlandite) in the hydrated cement to form calcium silicate hydrate.
A concrete analysis is useful for determining which mineral admixtures should be used to improve the quality of your concrete. For concrete consulting, contact C3S, Inc.