What Is Fly Ash Concrete?

Fly ash is a kind of volcanic ash material, which has no gelling performance. When there is water at normal temperature, the fly ash can react with the concrete in the secondary to generate hydrated calcium silicate which is hardly soluble in water. Glue, which not only reduces the possibility of dissolution, but also fills the pores inside the concrete, which can improve the strength and impermeability of the concrete. This effect of fly ash is called the volcanic ash effect.

Fly ash concrete

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Fly ash is a kind of volcanic ash material, which has no gelling performance. When there is water at normal temperature, the fly ash can react with the concrete in the secondary to generate hydrated calcium silicate which is hardly soluble in water. Glue, which not only reduces the possibility of dissolution, but also fills the pores inside the concrete, which can improve the strength and impermeability of the concrete. This effect of fly ash is called the volcanic ash effect.

In addition to the volcanic ash effect, there are two other reasons for the improvement of mechanical properties and durability of concrete by fly ash: first, the morphological effect. The main mineral composition of fly ash is the glass body. The spherical glass body has a smooth surface, fine particle size, dense texture, small internal specific surface area, and low water absorption. Therefore, the addition of fly ash reduces the water requirement for concrete preparation, reducing The early drying shrinkage of concrete has greatly improved the compactness of concrete. Second, the filling effect. The fine particles in fly ash are evenly distributed among the cement particles, which can not only fill the gaps between the cement particles, but also improve the particle gradation of the cementitious material and increase the compactness of the cement colloid. Therefore, the topography effect, filling effect and pozzolan effect are also called the three major effects of fly ash to improve concrete performance.