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

Authors

  • S. A. Dahri Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • B. A. Memon Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • M. Oad Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • R. Bhanbhro Department of Civil Engineering, Quaid-e-Awam University of Engineering Science and Technology, Pakistan
  • I. A. Rahu Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
Volume: 11 | Issue: 5 | Pages: 7641-7646 | October 2021 | https://doi.org/10.48084/etasr.4349

Abstract

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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[1]
S. A. Dahri, B. A. Memon, M. Oad, R. Bhanbhro, and I. A. Rahu, “Quality of Recycled Aggregates and Compressive Strength of No-Fines Recycled-Aggregate Concrete”, Eng. Technol. Appl. Sci. Res., vol. 11, no. 5, pp. 7641–7646, Oct. 2021.

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