Fly ash-based geopolymer mortar modified with silica fume, superplasticizer, and PET plastic wasteAprilina Purbasari, Muhammad Saefillahil Abdat and Reyna Zahwa Muji MartantriE3S Web Conf., 655 (2025) 02003DOI: https://doi.org/10.1051/e3sconf/202565502003