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ABSTRACT
This project was undertaken to carry out a comparative assessment of the flexural strength of prestressed Portland Cement concrete and prestressed geopolymer concrete. The objectives were to carry out tests on materials to be used, carry out other supporting tests, carry out flexural test on prestressed OPC and geopolymer concrete beams, and analyze the results gotten from all the tests carried out. The tests carried out on the materials used were the sieve analysis test on aggregates, specific gravity test on the kaolin, metakaolin, cement and aggregates, and the tensile test on cables, tendons and wires. The other supporting tests done were the compressive strength test of the geopolymer concrete, and workability test (slump test) on concrete. Then the assessment of the prestressed beams was carried out by mixing of the geopolymer concrete, casting, compaction, curing, and carrying out flexural tests on them using the flexural testing machine and the 4-point flexure test set up on the MCC8. The compressive strength of the 8 molarity metakaolin-based geopolymer concrete was gotten as 57.950 N/mm2 after 28 days which is higher than that of the 10 molarity and 12 molarity beams. The flexural strength was gotten for the OPC concrete beams (Grade 30, Grade 40 and Grade 50), as well as the GPC beams (8M, 10M and 12M). The different compressive and flexural strengths were shown on graphs and charts respectively, and compared to each other for different ages of curing.
