Effect of the addition of organic wastes (cork powder, nut shell, coffee grounds and paper sludge) in clays to obtain expanded lightweight aggregates - Cobo-Ceacero CJ; Moreno-Maroto JM; Guerrero-Martínez M; Uceda-Rodríguez M; López AB; Martínez García C; Cotes-Palomino T (Boletin De La Sociedad Espanola De Ceramica Y Vidrio, 2022)