Carbonation process in lime pastes with different water/binder ratio

• Main Authors: M. Arandigoyen, J. I. Álvarez
• Format: Article
• Language: English
• Published: Consejo Superior de Investigaciones Científicas 2006-03-01
• Series: Materiales de Construccion
• Subjects: kinetics; microstructure; carbonation; blended pastes
• Online Access: http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/88

Most research on binder carbonation is based on the analysis of depth changes in the carbonation front. Moreover, previous studies have dealt with mortars, where aggregates play a role in the variations in carbonation patterns. In the approach adopted in the present study, carbonation was determined in terms of the variation in weight resulting from CO2 absorption, and a new parameter (independent of the drying process), denominated A, was established. This parameter was assessed in several lime pastes with different W/B (water/binder) ratios and its variations were correlated to paste microstructure. Due to the type of porosity prevailing in lime pastes, diffusion took place according to Fick's law; water was retained not by capillarity but by surface adsorption. Drying did not retard carbonation in lime pastes