COMPARATIVE STRENGTH OF PARTIALLY REPLACED RICE HUSK ASH WITH CEMENT MORTAR  A CASE STUDY OF OBUBRA L.G.A OF CROSS RIVER STATE: Akwapoly Journal of Communication and Scientific Research (APJOCASR). APJOCASR. 2024;7(2):97-107. Accessed July 15, 2025. https://akwapolyjournal.org/index.php/apjocasr/article/view/31