Strength Evaluation and High Temperature Performance Assessment of Fly Ash Based Cementecious Material

Concrete is the most common construction material in the world because it combines very good mechanical and durability properties, workability and relative low cost. However, cement production emits greenhouse gases, mainly CO2, being responsible for about 5% of global anthropogenic CO2 emissions in the world. The use of pozzolans as cement replacement is a problem that would have local solutions since transport is one of the main cost components for cementitious materials. The application of fly ash in concrete production brings positive effects of the environment; hence it reduces the problems associated to their disposal. Several benefits will be attained regarding green house gas emissions resulting from the use of mineral admixtures as cement additive, since their use allows reducing cement production. Regarding their use as cement additive, mineral admixtures affect the performances of paste, mortar and concrete owing to both physical and chemical effects. Therefore it is possible to use fly ash as cement additive and replacement material to improve quality and reduce cost of pozzolonic construction material The cement has been replaced by fly ash accordingly in the range of 0%, 5%, 10%, 15%, 20% & 25% by weight of cement for mix. Concrete mixtures were produced, tested and compared in terms of compressive strengths with the Conventional concrete. These tests were carried out to evaluate the compressive strength properties for the test results of 28, 56 days compressive strengths which were exposed to elevated temperatures of 4000C, 5000 C &6000C for time duration of 30 minutes and 60 minutes respectively.