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Mixture Design and Reaction Sequence for Recycling Construction Wood Waste into Rapid-Shaping Magnesia-Phosphate Cement Particleboard.
- Source :
-
Industrial & Engineering Chemistry Research . Jun2017, Vol. 56 Issue 23, p6645-6654. 10p. - Publication Year :
- 2017
-
Abstract
- This study has elucidated the roles of hydration chemistry and reaction sequence of magnesia-phosphate cement (MPC) in the upcycling 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 (MgKPO4·6H2O, MKP) for strength development. Low M/P ratios gave ill-formed MKP, whereas high M/P ratios resulted in unreacted magnesia. The optimal M/P 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *WOOD waste
*MAGNESIUM oxide
*HYDRATION
*PHOSPHATES
*CEMENT
*THERMOGRAVIMETRY
Subjects
Details
- Language :
- English
- ISSN :
- 08885885
- Volume :
- 56
- Issue :
- 23
- Database :
- Academic Search Index
- Journal :
- Industrial & Engineering Chemistry Research
- Publication Type :
- Academic Journal
- Accession number :
- 123614588
- Full Text :
- https://doi.org/10.1021/acs.iecr.7b01175