TY - JOUR
T1 - Recycling of desulfurization slag for the production of autoclaved aerated concrete
AU - Chen, Ying Liang
AU - Ko, Ming Sheng
AU - Chang, Juu En
AU - Lin, Chun Ta
N1 - Funding Information:
The authors gratefully acknowledge the Ministry of Science and Technology , Taiwan, for its financial support of this study (Contract No.: MOST 106-3114-E-006-007 and MOST 106-3113-E-007-002 ).
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/1/15
Y1 - 2018/1/15
N2 - 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.
AB - 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.
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U2 - 10.1016/j.conbuildmat.2017.09.195
DO - 10.1016/j.conbuildmat.2017.09.195
M3 - Article
AN - SCOPUS:85030865162
VL - 158
SP - 132
EP - 140
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -