The spherical shaped particles of fly ash act as miniature ball bearings within the concrete mix, thus providing a lubricant effect. This same effect also improves concrete pump-ability by reducing frictional losses during the pumping process and flat work finish-ability.
The replacement of cement by fly ash reduces the water demand for a given slump. The additional binder produced by the fly ash reaction with available lime allows fly ash concrete to continue to gain strength over time. Mixtures designed to produce equivalent strength at early ages (less than 90 days) will ultimately exceed the strength of straight cement concrete mixes.
The decrease in free lime and the resulting increase in cementitious compounds, combined with the reduction in permeability enhance concrete durability.
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