LUANG, Etwar; HERMANTO , Joni; USAMAH , Muhammad. Concrete Quality Design F’C 21 MPa Using SNI 7656:2012 Method Using Local Materials (C Ibu Selatan Quarry). JURNAL BIOSAINSTEK, [S. l.], v. 8, n. 2, p. 97–104, 2026. DOI: 10.52046/biosainstek.v8i2.2789. Disponível em: https://journal.tyarlyta.com/index.php/biosaintek/article/view/2789. Acesso em: 23 aug. 2026.