Synthesis of low-temperature calcium sulfoaluminate-belite cements from industrial wastes and their hydration: Comparative studies between lignite fly ash and bottom ash

A. Rungchet, Chi Sun Poon, P. Chindaprasirt, K. Pimraksa

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)

Abstract

Lignite fly ash and bottom ash were used as starting materials for comparison. Other waste materials viz., Al-rich sludge and flue gas desulfurization gypsum were also key players in raw mixes for the synthesis of CŜAB cement. For lignite fly ash as a starting material, mixed phases between ye'elimite and larnite were obtained, whereas for lignite bottom ash as starting material, only ye'elimite was obtained The hydration reaction was studied in terms of heat evolution, setting time, compressive strength and hydration product formation with various gypsum contents. The results showed a rapid formation of ettringite as a main hydration product mixed with calcium silicate hydrate, monosulfate and strätlingite phases as minority, with a fast final setting time of 24–26 min and high early compressive strength of 16.0 and 18.0 MPa in 1 day for CŜAB cements made of fly ash and bottom ash, respectively.
Original languageEnglish
Pages (from-to)10-19
Number of pages10
JournalCement and Concrete Composites
Volume83
DOIs
Publication statusPublished - 1 Oct 2017

Keywords

  • Bottom ash
  • Calcium-sulfoaluminate-belite cement
  • Hydration
  • Hydrothermal-calcination method
  • Lignite fly ash

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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