The third method of curing was carried out by leaving the concrete cubes in the open and allowing air to act on the cubes, also for a total of 28 days. ![]() In this method, the concrete cubes were covered with polythene sheet and left airtight for a total of 28 days. The second method was the membrane layer method. The first method was the immersion/ponding method. The cubes were demoulded after twenty-four hours and four different methods of curing were adopted in accordance to. Two different mix ratios were prepared according to,. 160 concrete cube specimens were cast of dimensions 150 mm × 150 mm × 150 mm in steel mould in accordance to. ![]() The coarse aggregate size used 20 mm diameter, the fine aggregates used were graded appropriately. The materials for this research were Ordinary Portland Cement (OPC) which was used as the binder throughout the research, fine, and coarse aggregates. 2. Experimental design, materials and methods
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