C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 16/02 (2006.01) B28B 1/52 (2006.01) C04B 18/26 (2006.01) C04B 28/08 (2006.01) C04B 40/02 (2006.01)
Patent
CA 2050643
A novel method of making a wood composite employing cellulosic material as the wood component and pulverized blast-furnace slag as the binder component and the product produced thereby is disclosed. A settable mixture of the wood component, binder component and water is prepared and thereafter subjected to a forming pressure within a confined space. While in its confined condition, the mixture is also subjected to heat and carbon dioxide (CO2) for a time and at a temperature sufficient to cause accelerated and early setting of the mixture. Optionally, calcium-rich compounds can be added to the settable mixture as a slag cement binder enhancer and sodium silicate can also be used as a mineralizer. The cellulosic material can also be pre-treated with a fire retardant resulting in a cementatious wood composite exhibiting improved fire resistance and in situ fire load bearing strength. Slag cement is plentiful, being a by-product of steel mills, but as a binder, is significantly less expensive than Portland cement. Employing CO2 injection, comparable set times for slag and Portland cements can be obtained, but the wood composite employing a slag cement binder has superior final strength.
Fpinnovations
Na
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