Quality of Recycled Aggregates and Compressive Strength of No-Fines Recycled-Aggregate Concrete
Received: 21 July 2021 | Revised: 20 August 2021 | Accepted: 28 August 2021 | Online: 12 October 2021
Corresponding author: M. Oad
This research paper presents the laboratory investigations of the compressive strength of no-fines concrete made with demolished waste as coarse aggregates used in percentages from 20% to 100%. The basic properties of aggregates were determined. Sieve analysis of both conventional and recycled aggregates was conducted to ensure the existence of well-graded aggregates in concrete. Nine concrete mixes were designed with an aggregate-cement ratio of 4. Additionally, three batches were prepared (conventional, recycled, conventional no-fines concrete) and the results were compared. For all mixes, the water-cement ratio was equal to 0.5. In each batch, 5 cylinders of standard size (total 60 samples) were prepared and cured for 28 days. The weight of the specimens was determined and compressive strength was checked in a Universal Testing Machine under gradually increasing load. A decrease in weight and compressive strength was recorded for the batches of the proposed concrete. Results show that at 40% replacement level the loss of compressive strength is 19% and the weight reduction of the samples was equal to 9%.
Keywords:recycled aggregate concrete, no-fines concrete, compressive strength, demolishing waste, recycled coarse aggregates
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