Cement-fly ash mortars durability, with fly ash from fluidized bed boilers and conventional combustion, exposed to aggressive environment influenceElżbieta Janowska-Renkas, Jolanta Kowalska, Grzegorz Janus and Agnieszka KaliciakMATEC Web Conf., 174 (2018) 02006DOI: https://doi.org/10.1051/matecconf/201817402006