Attack of concrete floors in pig houses by feed acids: influence of fly ash addition and cement-bound surface layers

acetic acid acide acide lactique acido acetico acids aliment pour animaux beton cendre volante cerdo concrete ensayo feeds floors fly ash lactic acid piensos piggeries pisos plancher pocilga polvo de cenizas porcherie porcin soil morphological features surface layers swine testage testing trait morphologique du sol