Recycling of waste autoclaved aerated concrete powder in Portland cement by accelerated carbonation
Copyright © 2019 Elsevier Ltd. All rights reserved.
| Veröffentlicht in: | Waste management (New York, N.Y.). - 1999. - 89(2019) vom: 15. Apr., Seite 254-264 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2019
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| Zugriff auf das übergeordnete Werk: | Waste management (New York, N.Y.) |
| Schlagworte: | Journal Article Carbonation curing Chloride ion penetration Compressive strength Microstructure Portland cement Waste autoclaved aerated concrete Carbonates |
| Zusammenfassung: | Copyright © 2019 Elsevier Ltd. All rights reserved. To recycle waste autoclaved aerated concrete (WAAC) and minimize environmental pollution induced by Portland cement (PC), carbonation curing was performed on cement pastes containing variable replacement levels (0-50%) of waste autoclaved aerated concrete powder. Compressive strength and chloride ion permeability of PC-WAAC specimens were measured and related mechanisms were demonstrated by X-ray diffraction (XRD), 29Si solid-state Nuclear Magnetic Resonance (NMR), thermogravimetry-differential thermal analysis (TG-DTA), mercury intrusion porosimeter (MIP), scanning electron microscope (SEM) and back scattered electron images (BSE) measurements. Results showed that the PC-WAAC specimens presents a higher compressive strength increase than the pure PC specimen after carbonation curing and the optimal dosage of WAAC is 20%. This effect compensates the decreasing strength induced by the incorporation of WAAC. Chloride ion penetration resistance of cement pastes were also improved by carbonation curing due to the refinement of pore structure. Up to 20% of WAAC can be successfully recycled to replace PC without compromising strength and chloride ion permeability. Moreover, around 11.23-19.02% of CO2 by the total binder weight can be captured. Therefore, this technology has a great environmental potential to both recycling of construction waste and capture of greenhouse gas |
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| Beschreibung: | Date Completed 12.09.2019 Date Revised 12.09.2019 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1879-2456 |
| DOI: | 10.1016/j.wasman.2019.04.018 |