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The purpose of the porosity measurements was to compare the boards made by two different methods: the conventional, hydration curing method and the CO 2 injection method, and to find out how their porosity affects water absorption. The specific pore-surface area of the CO 2 -hardened boards was much smaller than that of the hydrated cement-bonded particleboards. Regarding the pore size distribution diagram, in the case of the CO 2 -hardened boards, there were two peaks on the graph (one peak at a pore diameter of around 6-8 μm, and a second peak at around 2 μm), and in the case of the conventional boards there was only one peak at 2 μm. The total pore volume of the CO 2 -hardened boards was larger than that of the hydrated boards. Water absorption of the CO 2 -hardened boards was lower than that of the hydrated particleboards. There was no relationship between the specific pore-surface area and water absorption, and between the total pore volume and water absorption. The use of CO 2 did not affect water absorption and these boards still displayed a higher initial strength.

Porosity of Cement-Bonded Particleboards Hardened by CO2 Injection and Cured by Hydration