Recycling of desulfurization slag for the production of autoclaved aerated concrete

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

doi:10.1016/j.conbuildmat.2017.09.195

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 journal › Article › peer-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 language	English
Pages (from-to)	132-140
Number of pages	9
Journal	Construction and Building Materials
Volume	158
DOIs	https://doi.org/10.1016/j.conbuildmat.2017.09.195
Publication status	Published - 2018 Jan 15

All Science Journal Classification (ASJC) codes

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

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title = "Recycling of desulfurization slag for the production of autoclaved aerated concrete",

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.",

author = "Chen, {Ying Liang} and Ko, {Ming Sheng} and Chang, {Juu En} and Lin, {Chun Ta}",

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AU - Chen, Ying Liang

AU - Ko, Ming Sheng

AU - Chang, Juu En

AU - Lin, Chun Ta

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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