Workability, Mechanical Properties and Sulfate Resistance of Self Compacting Concrete with Ternary Blended Cementitious Materials
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Abstract
This research aimed to study the workability, mechanical properties, and sulfate resistance of self compacting concrete (SCC) ternary blended cementitious materials. Portland cement type I was replaced by high volume fly ash at 50%, 60%, and 70% by weight of binder. Silica fume was used to partially replace cement at the rate of 10% by weight of binder. The water to binder ratio of 0.4 was used and superplasticizer was used at 2% by weight of binder. The unit weight, slump flow, and slump flow loss, segregation resistance, setting time, porosity, water absorption, compressive strength, and weight loss of sulfate were investigated. The results showed that the replacement content of fly ash affected directly on the workability of SCC. The concrete containing 70% of fly ash had the best flowing ability, flow loss, and segregation resistance. The porosity and water absorption when using fly ash replacement content of 60% with silica fume replacement content of 10% by weight of binder had the highest value. The replacement fly ash content of 50% by weight of binder had the fastest initial setting time while the compressive strength and weight loss in sulfate at the age of 180 days had the highest compressive strength at 396.21 kilogram square centimeter and the ratio of weight loss was lower than for control concrete. Therefore, with a high volume of fly ash replacement up to 50% by weight of binder was optimum replacement content for sulfate resistance of SCC.
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