Ho Viet Thang, Tran Thi Thanh Phuong and Le Thi Ngoc Quy 2026. Partial replacement of natural sand with recycled waste oyster shells in concrete production of grade 30 MPA. JOURNAL OF MATERIALS & CONSTRUCTION. 16, 01 (Apr. 2026). DOI:https://doi.org/10.54772/jomc.v16i01.1240.