Recycling of Waste Wooden Construction Materials as Components for Wood-Urethane Resin Composites

Title: Recycling of Waste Wooden Construction Materials as Components for Wood-Urethane Resin Composites
Author(s): Y. Kurimoto
Paper category : conference
Book title: RILEM International Symposium on Environment-Conscious Materials and Systems for Sustainable Development
Editor(s): N. Kashino and Y. Ohama
Print-ISBN: 2-912143-55-1
e-ISBN: 2912143640
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 395 - 402
Total Pages: 8
Nb references: 7
Language: English

Abstract: A new method to recycle whole of used formwork panels as components for wood-urethane resin
composites was investigated. The formwork panels were crushed using a chip crusher and the
resulting shreds were divided into three classes. Fractions retained at 40mm mesh screen and at
10mm mesh screen were used as wooden aggregates. The other fractions passing through 10mm
mesh screen were subjected to a wood-liquefaction process in order to synthesize liquefied wood-isocyanate
resin (LW-MDI), which comprised the binder for the above mentioned aggregates.
Results of the liquefaction with acid catalyst of 1-3% showed that 28-51% of the components
of formwork panels were liquefied. The hydroxyl number and moisture content of the liquefied
wood were used to decide the material formation of LW-MDI according to a fixed isocyanate to
hydroxyl group ratio (NCO/OH). Specimens of wood-urethane resin composite tile with different
density were prepared from the wooden aggregates and LW-MDI at 0.6-1.6 NCO/OH by steam-injection
pressing. The increases in NCO/OH and density enhanced the physical properties of
the tiles under bending tests. No significant differences were observed in the properties among
the tiles prepared from the LW-MDI with different liquefaction rates. These tiles are thought to
be suitable as environmental conscious revetment blocks.

Online publication: 2004-11-24
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143640.047