Details
| Original language | English |
|---|---|
| Pages (from-to) | 441-450 |
| Number of pages | 10 |
| Journal | Journal of Materials in Civil Engineering |
| Volume | 24 |
| Issue number | 4 |
| Early online date | 16 Sept 2011 |
| Publication status | Published - 1 Apr 2012 |
Abstract
Recyclable fractions such as calcium and sodium aluminosilicates including zeolite sodalite (SOD) were obtained from hydrothermal treatment of autoclaved aerated concrete (AAC) waste material under addition of sodium aluminate. Three experimental series were performed using hydrothermal conditions at temperatures of 80°C and 180°C (autogeneous pressure) and AAC aluminate mass ratios of 0.8 and 2.0. Different solvents were applied in each series; whereas the reactions were carried out in water or 1-molar NaOH, a special two-step process was developed, starting with acid leaching of AAC (1-molar citric acid), followed by alkaline treatment of the whole slurry in 1-molar NaOH. Final products were analyzed by X-ray powder diffraction. Selected samples were further investigated by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). The results exhibit model character for new ways of resource recycling of AAC.
Keywords
- Aluminosilicates, Autoclaved aerated concrete, Building materials recycling, FTIR, Hydrothermal synthesis, SEM/EDX, XRD, Zeolites
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
Sustainable Development Goals
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In: Journal of Materials in Civil Engineering, Vol. 24, No. 4, 01.04.2012, p. 441-450.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Reaction Behavior of Autoclaved Aerated Concrete and Sodium Aluminate at Mild Alkaline and Acid Hydrothermal Conditions
T2 - Model for AAC Recycling
AU - Hartmann, Andrea
AU - Buhl, Josef C.
PY - 2012/4/1
Y1 - 2012/4/1
N2 - Recyclable fractions such as calcium and sodium aluminosilicates including zeolite sodalite (SOD) were obtained from hydrothermal treatment of autoclaved aerated concrete (AAC) waste material under addition of sodium aluminate. Three experimental series were performed using hydrothermal conditions at temperatures of 80°C and 180°C (autogeneous pressure) and AAC aluminate mass ratios of 0.8 and 2.0. Different solvents were applied in each series; whereas the reactions were carried out in water or 1-molar NaOH, a special two-step process was developed, starting with acid leaching of AAC (1-molar citric acid), followed by alkaline treatment of the whole slurry in 1-molar NaOH. Final products were analyzed by X-ray powder diffraction. Selected samples were further investigated by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). The results exhibit model character for new ways of resource recycling of AAC.
AB - Recyclable fractions such as calcium and sodium aluminosilicates including zeolite sodalite (SOD) were obtained from hydrothermal treatment of autoclaved aerated concrete (AAC) waste material under addition of sodium aluminate. Three experimental series were performed using hydrothermal conditions at temperatures of 80°C and 180°C (autogeneous pressure) and AAC aluminate mass ratios of 0.8 and 2.0. Different solvents were applied in each series; whereas the reactions were carried out in water or 1-molar NaOH, a special two-step process was developed, starting with acid leaching of AAC (1-molar citric acid), followed by alkaline treatment of the whole slurry in 1-molar NaOH. Final products were analyzed by X-ray powder diffraction. Selected samples were further investigated by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). The results exhibit model character for new ways of resource recycling of AAC.
KW - Aluminosilicates
KW - Autoclaved aerated concrete
KW - Building materials recycling
KW - FTIR
KW - Hydrothermal synthesis
KW - SEM/EDX
KW - XRD
KW - Zeolites
UR - http://www.scopus.com/inward/record.url?scp=84860356486&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)MT.1943-5533.0000392
DO - 10.1061/(ASCE)MT.1943-5533.0000392
M3 - Article
AN - SCOPUS:84860356486
VL - 24
SP - 441
EP - 450
JO - Journal of Materials in Civil Engineering
JF - Journal of Materials in Civil Engineering
SN - 0899-1561
IS - 4
ER -