Abstract
The effect of CO2 injection on initial strength increase and hardening of cement-fibre mix in a cement bonded particle board (CBPB) production was evaluated. Different cement contents, formation pressure and types of fibres were considered. The initial strength increase with CO2 injection is so much faster than this caused by conventional hydration that the produced samples do not need additional curing before they can be stored. Similar strength and stiffness values as in conventional products on the market are gained with lower cement content for similar types of fibres. Visual inspection of board surfaces aged for 13 years in a harsh exterior environment as well as comparison of strength and stiffness values for these boards when new and after ageing, gives a very satisfying result. The combined effect of the above discussed gains results in markedly increased productivity at lower cost and lower environmental impacts than is possible in traditional CBPB production.
Highlights
Cement bonded particle boards (CBPB) are traditionally made of wood fibres, cement and water, usually with some additives to speed up the bonding process, in traditional production caused by hydration of cement
The aim of this paper is i.e. to describe tests on cement bonded particle board (CBPB) with wood fibres, comparison of CO2 injected CBPB with traditional CBPB, and test results from small laboratory CBPB specimens with wheat fibres and CO2 injection
Small scale specimens were produced in the laboratory simulating the traditional CBPB production as described earlier, the specimen were stored for seven days in a curing cabinet at 20 ̊C, 50% RH before testing
Summary
Cement bonded particle boards (CBPB) are traditionally made of wood fibres, cement and water, usually with some additives to speed up the bonding process, in traditional production caused by hydration of cement. Gudmundsson due i.e. to economic reasons are only used to a very limited extent, compared to common boards with organic binder (plywood, OSB). The CBPB boards have very interesting properties regarding stiffness, fire, acoustics and resistance to termites and microorganisms. There are mainly two different methods in use to produce CBPB; the Hatscheck process and the Elmendorf process. Asbestos fibres were used whereas these comprise cellulose fibres; fibre length up to 4 mm (commonly less than 3 mm), diameter typically around 40 μm
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