Agita Kabdiyono E, Luthfi Hanafi. The Effect of Coal Ash As a Sand Substitute on The Compressive Strength of Concrete. JTS [Internet]. 2026 Jul. 25 [cited 2026 Jul. 29];5(2):100-12. Available from: https://journal.admi.or.id/index.php/JTS/article/view/2947