For decades, fly ash was the concrete admixture for ready-mixed concrete and concrete products. This era is coming to an end. CO2 savings and alternative energy sources are increasingly coming into focus, leading to a shortage of fly ash: less coal means less fly ash. sh_stoneash® is the safe alternative, as it is not a secondary product, but a specifically produced concrete additive. In any quantity at any time and in consistently high quality. That is sh_stoneash®.