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Title: Recycling contaminated wood into eco-friendly particleboard using green cement and carbon dioxide curing
Authors: Wang, L
Chen, SS
Tsang, DCW 
Poon, CS 
Shih, K
Keywords: CO2 sequestration
Cement-bonded particleboard
Hydration chemistry
Microstructure analysis
Timber waste
Value-added recycling
Issue Date: 2016
Publisher: Elsevier
Source: Journal of cleaner production, 20 Nov. 2016, v. 137, p. 861-870 How to cite?
Journal: Journal of cleaner production 
Abstract: Landfill disposal of contaminated wood formwork from construction sites presents significant environmental burdens and economic wastage. This study proposed an innovative and low-carbon technology by using magnesia cement and CO2 curing to transform contaminated wood waste into eco-friendly cement-bonded particleboards, which demonstrated excellent compatibility and value-added properties. The microstructure characteristics and cement hydration chemistry were revealed by mercury intrusion porosimetry and X-ray diffraction analyses. At the optimal water to cement ratio of 0.3, the particleboards contained the lowest total pore area (10.2 m(2) g(-1)) and porosity (26.1%), thereby successfully complying with the International Standards of mechanical strength (>9 MPa) and dimensional stability (<2% swelling after 24-h water immersion). An integration of 2-h CO2 curing facilitated carbonation at early stage and reduced the volume of mesopores and air pores, which contributed to strength development and carbon sequestration in the particleboards (8.78% by weight) helping to combat global warming. A subsequent 7-d air curing further enhanced the strength to outcompete those of 28-d air curing only, because rehydrated formation filled in capillary pores (reduced from 0.11 mL g(-1) to 0.03 mL g(-1)). Moreover, fire resistance and thermal stability were improved by the chemistry of magnesia cement and accelerated carbonation. The carbonated particleboards retained high strength and stable dimension after 1-h heating up to 200 degrees C.
ISSN: 0959-6526
DOI: 10.1016/j.jclepro.2016.07.180
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