Studi karakteristik agregat kasar ringan buatan dari limbah botol plastik Polietilen Terephtalate (PET) dan pengaruh agregat kasar ringan buatan tersebut terhadap sifat-sifat mekanis beton ringan = Charateristic study of lightweight coarse aggregate made from waste plastic Polyethylene Terephtalate (PET) bottle and its effect to the mechanical properties of lightweight concrete. / Sony Aria Wiryawan - Sony Aria Wiryawan, author (2006)