Recycling of desulfurization slag for the production of autoclaved aerated concrete

Ying Liang Chen, Ming Sheng Ko, Juu En Chang, Chun Ta Lin

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The purpose of this study was to reuse desulfurization (De-S) slag in the production of autoclaved aerated concrete (AAC). The non-magnetic fraction of De-S slag is rich in calcium and silicon compounds, and therefore suitable to be an alternative raw material for AAC production. The calcium compounds in the De-S slag used in this study were Ca(OH)2, CaCO3, γ-Ca2SiO4, and CaF2 rather than CaO, and they affected the foaming of AAC mortars due to the insufficient alkalinity. Using 0.17 M NaOH(aq) to replace water or calcining the De-S slag in advance both improved the foaming of mortars, and thus obtained AAC products with stable properties. The formation and morphology of tobermorite in AAC were altered by the addition of De-S slag, probably due to the foreign ions introduced by the slag. The changes in tobermorite should also be related to the decline in the compressive strength of AAC specimens.

Original languageEnglish
Pages (from-to)132-140
Number of pages9
JournalConstruction and Building Materials
Volume158
DOIs
Publication statusPublished - 2018 Jan 15

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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