Accelerated carbonation curing of cellulose fiber-cement composites is known to improve their durability in the form of decreased porosity and increased mechanical properties. In addition, because carbonation results in a decrease in the alkalinity of cement paste, it makes cement less aggressive towards the cellulose fibers. The properties of the composite can be controlled by adjusting carbonation curing time, carbonation curing pressure as well as mechanical rolling pressure. In this context, a continuum model is proposed that couples the process of hydration of cement with heat, moisture and CO2 transport, including precipitation of CaCO3, change of porosity because of hydration as well as carbonation and water release and consumption. Experimental data on carbonation curing of a cellulose fiber-cement composite has recently become available, which serves to validate the model. Preliminary results indicate that the model is able to predict within reasonable accuracy the depth of carbonation.
|Title of host publication
|4th International Rilem Conference on Microstructure Related Durability of Cementitious Composites
|TU Delft - Technische Universiteit Delft
|Number of pages
|Published - 29 Apr 2021