e-Plastics as partial replacement for aggregates in concrete

• L.A. Parsons ^[1] ; S.O. Nwaubani ^[1]
  1. [1] University of the Witwatersrand

     University of the Witwatersrand

     City of Johannesburg, Sudáfrica

     
• Localización: Wastes: solutions, treatments and opportunities III / Cândida Vilarinho (dir.), Fernando Castro (dir.), Margarida Gonçalves Neto (dir.), Ana Luísa Fernando (dir.), 2020, ISBN 9780367257774, págs. 275-280
• Idioma: inglés
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• Resumen

  • This paper describes an investigation aimed at producing structural strength concrete (>25 MPa) which incorporates different types of waste electrical and electronic plastics (e-Plastic), as replacement for natural aggregates. The concrete specimens studied were made with polycarbonate and acrylonitrile butadiene styrene (PC/ABS), high impact polystyrene (HIPS) and ABS as well as blends of the aforementioned e-Plastic in a ratio of 1:1:1. Granulated e-Plastic was used to replace both the natural coarse and fine crushed aggregates in proportions of 5%, 10%, 20% and 30% by volume of the natural aggregates. Tests carried out in the fresh state showed that as the percentage replacement of e-Plastic increased, the workability decreased. Consequently, a superplasticising admixture was needed to maintain a similar slump value for all the mixtures. Compressive strength after curing for 3, 7, 28 and 90-days showed that the concrete incorporating the e-Plastic did meet the minimum requirements for structural application of concrete.