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ABSTRACT
The ever-increasing cost of cement, coupled with the degrading environmental effects associated with mining and extraction of materials for cement and the actual manufacturing of cement has been of concern to government and private developers in Nigeria and beyond. To attend to these problems, the use of Palm oil fuel ash (POFA) to partially replace cement in concrete was investigated. An evaluation of the strength of concrete containing POFA and afterwards determination of the extent to which POFA can be incorporated in concrete were carried out. To achieve study objectives, tests such as sieve analysis, water absorption test and compressive strength test was conducted for some of the constituent materials to determine their suitability for the work at hand. 33 concrete cubes having standard size of 100mm x 100mm were cast and cured in water for 3, 7, 14 and 28 days. The cubes were made from concrete having 0%, 5%, 10% and 15% of cement replaced with POFA and a mix ratio of 1:2.75:4.88. 3 cubes were prepared for each mix ratio for water absorption for 28 days dry and 28 days wet. 3 kinds of curing were done on the cubes; wet curing, dry curing and wet + dry curing. The wet curing involved dipping the cubes for the duration of the respective days likewise the dry curing, the cubes were left to air dry for the required duration. The wet + dry curing involved immersing the cubes for 3 days, and allowing it to air dry for the remaining required time period.
