A MODEL OF CARBONATION AND A TECHNIQUE TO DETERMINE THE DEGREE OF CARBONATION

Author(s): Fridh, K. and Lars-Olof, N.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
e-ISBN: 978-2-35158-149-0
Publication year: 2015
Pages: 554-560
Total Pages: 7
Language: English

Abstract: To be able to estimate the service life due to carbonation induced corrosion and the CO2-uptake of different types of concrete is the degree of carbonation needed. This paper proposes and demonstrates a measuring technique together with a carbonation model.

The carbonation model which reveals the importance of the degree of carbonation is based on carbonation as a moving boundary where the rate is dependent on the amount of CO2 in the air, the diffusion coefficient of CO2 in carbonated concrete and the amount of CaO
which can be carbonated.

The degree of carbonation is obtained by dissolution of concrete in HCl and monitoring the increase of pressure the release of CO2 creates. This pressure is then translated through calibration curves to a CaCO3 content. The liquid is then analyzed regarding the content of calcium and the degree of carbonation is the ratio of CaCO3 to Ca.

With this information it is possible to calculate the amount of CO2 uptake and the progress of carbonation in concrete.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00