“HIGH-STRENGTH CEMENT-FREE CONCRETE MADE FROM FLY ASH AND PALM OIL FUEL ASH”, INTERNATIONAL JOURNAL OF GEOMATE, vol. 29, no. 132, pp. 12–19, Aug. 2025, Accessed: May 19, 2026. [Online]. Available: https://geomatejournal.com/geomate/article/view/4793