ISSN: 2265-6294

Review of Enhancing the Strength of Concrete with Recycled Aggregates Through the Addition of Silica Fume

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Talib Elahi, Vaibhav Dubey, Satish Parihar

Abstract

An experimental study was carried out to explore the performance of recycled aggregate concrete incorporating silica fume. Thirty concrete cubes measuring 6 inches each side were prepared in six batches using a 1:2:4 mix ratio and a water-cement ratio of 0.55. Each batch comprised five samples, with cement replaced by silica fume at rates of 0%, 5%, 10%, 15%, 20%, and 25%, while natural coarse aggregate was replaced by recycled coarse aggregate at a 50% rate. These specimens were cured for 28 days. Various tests including sieve analysis for fineness modulus of aggregates, water absorption, specific gravity tests, slump tests, and compressive strength tests on cubes were conducted. The results indicated that a 15% replacement of cement with silica fume yielded the highest compressive strength. Hence, the optimal dosage of silica fume in green concrete was determined to be 15%.

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