Reaction mechanisms of wood ash for use as a partial cement replacement

Nina M. Sigvardsen*, Mette R. Geiker, Lisbeth M. Ottosen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

An increase in the produced amounts of wood ashes (WAs) is seen worldwide. In this study, the potential use of two representative WAs as a partial cement replacement is investigated. The WAs originate from combustion of wood chips by grate combustion (WA1) and circulating fluidised bed combustion (WA2). Both WAs were found to possess hydraulic properties, no pozzolanic properties were detected. A substantial difference in strength development was observed between WA1 and WA2 attributed to the phases formed; WA2 contributing the most, ettringite in addition to other phases were formed, while gypsum formed in WA1 pastes.

Original languageEnglish
Article number122889
JournalConstruction and Building Materials
Volume286
Number of pages11
ISSN0950-0618
DOIs
Publication statusPublished - 2021

Bibliographical note

Funding Information:
Department of Civil Engineering at the Technical University of Denmark, Emineral A/S supported, Danielsen's Foundation and EKOKEM. The plants Värtaverket Combined Heat and Power Plant (Sweden) and Skærbæk Power Plant (Denmark) are acknowledged for supplying the investigated wood ashes.

Keywords

  • Compressive strength
  • Hydraulic activity
  • Phase development
  • Pozzolanic properties
  • Wood ash

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