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The setting and curing time of cement involves a succession of overlapping crystallization stages, unlike the curing of thermosetting resins, which is dependent on heat-activated molecular polymerization and crosslinking. During conventional manufacturing of Portland cementbonded particleboards, the setting/curing time is reduced by the use of additives and incremental temperatures during the setting and curing periods) In recent years the authors have developed a few methods of rapid curing systems for cement-bonded particleboards (CBP) using additives such as MgC12, CaC12, NaHCO 3, and Na2SiO3, together with steam-injection pressing or hot platen pressing for the initial setting of cement, followed by autoclaving or heating treatment for the subsequent curing. 2-~ The injection of carbon dioxide (CO2) gas during pressing is one of the methods currently being applied to reduce the pressing (setting) time of cement. However, the disadvantages of this method include the almost similar board properties as those produced by conventional method, 1 and requirement of at least 14 days to achieve complete curing, s This research aims to improve the quality of cementbonded particleboard and to reduce its curing time using a

New technology for manufacturing high-strength cement-bonded particleboard using supercritical carbon dioxide