Journal
JOURNAL OF CLEANER PRODUCTION
Volume 168, Issue -, Pages 452-462Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.09.038
Keywords
Hydration chemistry; Wood waste; Red mud; Magnesia-phosphate cement; Cement-bonded particleboard; Waste recycling
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Funding
- Construction Industry Council Research Fund [K-ZJJS]
- PolyU's Project of Strategic Importance [1-ZE12]
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To transform construction wood waste by magnesia-phosphate cement (MPC) into cement-bonded particleboards, instability of MPC in water that compromises durability of particleboards in moist environment needs to be addressed. This study proposed a novel use of alumina and red mud to improve water resistance of MPC particleboards. Cement hydration chemistry and microstructure characteristics were revealed by quantitative X-ray diffraction analyses and scanning electron microscopy. Addition of alumina or red mud (Mg/Al or Mg/Fe at optimal molar ratio of 10:1) facilitated formation of amorphous Mg-Al or Mg-Al-Fe phosphate gel, respectively, which enhanced compressive strength. Alumina improved short-term water resistance, whereas red mud provided better long-term water resistance. Red mud-MPC binder enhanced strength retention (by 22.8%) and reduced water absorption (by 26.4%) of particleboards after 72-h water immersion, probably attributed to stable scaly-like Mg-Al-Fe phosphate gel. This study demonstrated that red mud and wood waste are sustainable materials for producing particleboards. (C) 2017 Elsevier Ltd. All rights reserved.
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