Fly ash has been used as a mineral admixture in cement and concrete. Using it provides several advantages, such as improved strength and workability properties, and environmental benefits related to the disposal of waste materials and to reduced carbon dioxide emissions. Alkali Resistant glass fibers are used as additional reinforcement of constant 0.17% by weight of cement. Glass fibers acted as good crack arrester and increases split and flexural strength not increase in compressive strength. M40 grade of concrete is used for this study. The main objective of this work is to study the suitability of the fly ash as a mineral admixture for cement replacement and additional reinforcement of glass fibers in concrete. Fly ash as partial replacement of cement and glass fibers are used as additional reinforcement, which satisfies the various structural properties of concrete like compressive, split and flexural strength. From the entire study it is concluded that mix M3 (15%FA+0.17%GF) is the best combination among all mixes, which gives maximum, tensile strength, (10% FA + 0.17% GF) shows better flexure strength and mix M3 (15%FA) is shows god compressive strength at 56 days over normal concrete. There is no increased compressive strength at 7 days and split tensile strength in fly ash mixes.
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