Problems with Variability in Using Fly Ash in Mixed Cement
The use of fly ash as a substitute for cement clinker brings some benefits, but also problems. One of the biggest problems of using fly ash in general is its high variability. This paper is dedicated not only to the variability of fly ash in the Czech Republic, but the issue of different water absorption of fly ash is described here as well. In addition, one of the options for coping with variability is stated here. If we follow one of the main indicators for sorting fly ash, which is the grading curve, we can optimize the use of ash produced. Based on grading curves, the mixing of various ash fractions was optimized with regard to the porosity of the mixture. Porosity has a direct effect on the compressive strength of the resulting material. This optimization will subsequently be verified experimentally.