Carbonation Curing of Cement Bonded Fiberboard Made by Slurry-Dewatering Process

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Title: Carbonation Curing of Cement Bonded Fiberboard Made by Slurry-Dewatering Process

Author(s): Y. Shao and S. Wang

Publication: Special Publication

Volume: 260

Issue:

Appears on pages(s): 125-138

Keywords: carbon uptake; carbonation curing; cellulose fiberboard; very early strength

Date: 6/1/2009

Abstract:
Carbonation curing of cellulose fiberboard made by slurry-dewatering process was studied to examine their CO2 uptake capability, immediate carbonation strength and long term strength after subsequent hydration. Influencing parameters on CO2 uptake and strength gain were discussed. They included compact forming pressure, drying time, drying temperature, carbonation duration, fiber/cement ratio and water/cement ratio. It was found that cement bonded cellulose fiberboards had excellent carbonation capacity. The percent carbon uptake ranged from 13.5 % to 23.6%, based on cement content and process conditions. High degree of carbonation significantly improved early age strength and had no detrimental effect on the subsequent hydration strength. To promote more CO2 uptake and higher strength gain, carbonation rate should be controlled. This can be achieved through system optimization. Carbonation curing has shown the potential to replace traditional autoclaving and gain technical, economical and environmental benefits.