Improving circular economy by assessing the use of fly ash as a replacement of lime pastes reducing its environmental impact

Juan F. Saldarriaga, Ximena Gaviria, Jorge M. Gene, Roberto Aguado

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, bituminous coal, sugar cane, untreated and pretreated hazardous waste ashes are tested as supplementary cement materials, analyzing their reactivity in lime pastes prepared according to ASTM C–305, using a 0.5 water/lime ratio. The hydration process was stopped with acetone at the ages of 1, 3, 7, 14, 28, 56, 90 and 180 d. Mineral phases were determined by thermogravimetry, XRD, and SEM finding high contents of SiO2 and Al2O3 in the coal and sugarcane ashes, while in the hazardous waste ashes low contents of these oxides were found. Samples of sugarcane and untreated hazardous waste ashes seems to be attractive to be used as substitutes in the production of construction supplies. In addition to this, an E-factor analysis was carried out, which showed that carrying out fly ash replacements in any quantity contributes to the circular economy of all the economic activities involved. Reducing the amount of solid waste to be disposed of and improving the local and regional environmental quality.

Original languageEnglish
Pages (from-to)1008-1018
Number of pages11
JournalProcess Safety and Environmental Protection
Volume159
DOIs
StatePublished - Mar 2022

Keywords

  • Circular economy
  • Fly ashes
  • Lime paste
  • Reactivity
  • Waste

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