Plastic and nonmetallic article shaping or treating: processes – Reactive gas or vapor treatment of work
Patent
1990-09-18
1992-12-15
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Reactive gas or vapor treatment of work
264 83, C04B 4000
Patent
active
051714965
ABSTRACT:
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 (CO.sub.2) 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 CO.sub.2 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.
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Forintek Canada Corp.
Klotz Trevor C.
Theisen Mary Lynn
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