CeO2 Direct Blue 78 Gd2Ti2O7 pyrochlore History of engineering & technology Immobilization Radioactive soil waste SHS adsorption biochar cellulose cellulose aerogel cement cement and cement-lime reinforced mortars cement composites cement mortars cementitious grout cementless composites chitosan film circular economy co-fired fly ash cobalt copper eggshell emerging pollutants end-of-life tyre rubber fertilizer plant fiber reinforced food waste green grout green materials