Production of environmentally friendly sand-like products from granitoid waste sludge and coal fly ash for civil engineering

Roy Nir Lieberman, Y. Knop, Natalia Moreno Palmerola, Carmen Muñoz, Haim Cohen, M. Izquiredo, Jose Angel Lorenzo, B. Taboas, O. Font, Xavier Querol

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Processing granitoid rock for civil engineering, countertops, and paving generates sub-economical (transportation costs exceed their retail value) granite powder sludge. This paper evaluates the possibility of mixing granite waste (GW) produced at the Spanish quarries of Galicia with a second sub-economical substance, Class F coal fly ash (FA <20 wt% CaO). The GW would reduce the leachability of toxic trace elements enriched in Colombian fly ashes and form a sand-like product that could serve as a substitute product and would reduce the costs in industrial concrete and civil engineering projects. To investigate both the capability of the GW to reduce FA leaching (by physical adsorption) and the potential use of the aggregate product as a partial substitute in industrial concrete, the physical (e.g. morphology, crystallographic patterns, and surface area), mineralogical, and chemical (including leachability and chemical composition) properties of the aggregate product were tested. Moreover, properties of the concrete (compressive strength, ion penetration, workability, and electron microscope scanning results (SEM)) were also analyzed. The use of the end scrubbed product in the concrete mixture was found to enhance the performance of the concrete mixture, reducing the leaching of the hazardous elements, and improving the concrete produced.

Original languageEnglish
Article number117880
JournalJournal of Cleaner Production
StatePublished - 20 Nov 2019
Externally publishedYes

Bibliographical note

Funding Information:
We would like to thank the ICP-MS, ICP-AES technicians in the IDAEA/CSIC Institute. We would also like to thank the Centro Tecnologico del Granito (CTdG) for supplying granitoid byproducts from the Pontevedra quarries. Thanks to the Israeli Coal Ash Board for supplying the Israeli fly ash samples, and to ENDESA for supplying the Los Barrios fly ash. We would also like to acknowledge the Generalitat de Catalunya (AGAUR 2015 SGR33) for its support.

Publisher Copyright:
© 2019 Elsevier Ltd


  • Aggregates
  • Fly ash
  • Granite powder waste
  • Physical adsorption
  • Toxic trace elements


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