Quality of Recycled Aggregates and Compressive Strength of No-Fines Recycled-Aggregate Concrete

• Published in: Engineering technology and Applied science research Vol. 11; no. 5; pp. 7641 - 7646
• Main Authors: Dahri, S. A., Memon, B. A., Oad, M., Bhanbhro, R., Rahu, I. A.
• Format: Journal Article
• Language: English
• Published: Dionisios Pylarinos 12.10.2021
• Subjects: Civil Engineering; Engineering Sciences
• ISSN: 2241-4487; 2040-7467; 1792-8036
• DOI: 10.48084/etasr.4349

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%.