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Study of the performance of concrete based on recycled aggregates

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Author Affiliations

  • 1National Higher School of Public Works of N'Djamena, Chad
  • 2National Office for Higher Education Examinations and Competitions (ONECS) N'Djamena, Chad
  • 3National Higher School of Public Works of N'Djamena, Chad

Int. Res. J. Environment Sci., Volume 12, Issue (1), Pages 8-13, April,22 (2023)

Abstract

The deposition of solid waste throughout the city is a threat to the population and to the ecosystems. The objective of the work is to seek a solution to this environmental problem. The work consists in studying the performance of concrete with aggregates from recycling. The experimental analyses involved two types of concrete: a concrete with ordinary gravels (BGO) and a concrete with 100% of recycled gravels (BGR) then the results are compared. The results of the particle size analysis show that the recycled gravels contain on the one hand a lot of elements lower than 5 mm (10.84%) which is the sandy part whereas the ordinary gravels contain less (1.32%). On the other hand, the recycled gravels contain a lot of coarse elements, compromising in the concrete the inter-granular compactness. The real densities are 2.39 g/cm3 and 2.53 g/cm3 respectively for Recycled Gravel (GR) and Ordinary Gravel (GO). The porosity of recycled gravel is higher than that of ordinary gravel. The density of recycled gravel concrete is lower than that of ordinary gravel concrete. The value of 40 of the Los-Angeles coefficient characterizes a poor aggregate in terms of impact resistance. As for the mechanical parameters, the compressive strength is 19 Mpa against 22 Mpa of ordinary gravel concrete. To have a better compactness of the granular mixture, the reconciliation of the biggest elements is necessary. This has been observed on the compressive strength which is 20 Mpa.

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