IRNAWAN, M. C.; LUBIS, R. R. A. Behavioral Study of Soft Soil Beneath the Embankment Improved by Columns Derived from Recycled Concrete Aggregate and High-Calcium Fly Ash-Based Geopolymer. Engineering Science Letter, [S. l.], v. 5, n. 03, p. 286–291, 2026. DOI: 10.56741/IISTR.esl.002462. Disponível em: https://journal.iistr.org/index.php/ESL/article/view/2462. Acesso em: 4 nov. 2026.