Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/76297
Title: Mixture design and reaction sequence for recycling construction wood waste into rapid-shaping magnesia-phosphate cement particleboard
Authors: Wang, L 
Yu, IKM 
Tsang, DCW 
Li, S 
Poon, CS 
Issue Date: 2017
Publisher: American Chemical Society
Source: Industrial and engineering chemistry research, 2017, v. 56, no. 23, p. 6645-6654 How to cite?
Journal: Industrial and engineering chemistry research 
Abstract: This study has elucidated the roles of hydration chemistry and reaction-sequence of magnesia phosphate cement (MPC) in the upcyclirig of construction wood waste into rapid shaping cement-bonded particleboards. The mineralogy and microstructure were evaluated using thermogravimetry, quantitative X-ray. diffraction, scanning electron microscopy, and mercury intrusion porosimetry. The results showed that the magnesia-to-phosphate (M/P) ratio controlled the formation of magnesium potassium phosphate hexahydrate (MgKPO4 center dot 6H(2)O, MKP) for strength development. Low M/P ratios gave ill-formed MKP, whereas high M/P ratios resulted in unreacted magnesia. The optimal IMP ratio of 7 led to a much shorter setting time and greater compatibility with wood waste than for Ordinary Portland cement. Wood waste can provide a platform for cement hydration and porosity for harboring crystalline MKP and also, regulate water release to maintain a moderate MPC reaction. We also highlight the importance of reaction sequence for promoting matrix homogeneity and MKP crystallinity. Our approach enables fast production of value-added construction products from wood waste.
URI: http://hdl.handle.net/10397/76297
ISSN: 0888-5885
EISSN: 1520-5045
DOI: 10.1021/acs.iecr.7b01175
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