Thermodynamic Interpretation of Carbonation Process of Portland Cement Hydration Products

Abstract:

Cement hydration products carbonation is not only blamed for the carbonation-induced hardened cement paste or concrete cracking, also attributed to the pore water PH-value decrease, which causes the reinforcement corrosion under the existence of water and oxygen due to removal of oxide film passivating rebar surface, in hardened cement paste and concrete. Based on chemical thermodynamics, this paper presents the susceptibility of different cement hydration products to carbonation through calculating their Standard Gibbs Free Energy respectively, Gibbs free energy under temperature variation and the minimum equilibrium pressure of carbon dioxide triggering the carbonation process. The calculated results show that, under standard state (25°C, 100kpa), the minimum equilibrium pressure of carbon dioxide triggering carbonation process is significantly variable for different types of cement hydration products. For example, mono-sulfate sulfoferrite hydrates (3CaOFe₂O₃CaSO₄12H₂O) is the most susceptible to carbonation, followed by mono-sulfate aluminate hydrates (3CaOAl₂O₃CaSO₄12H₂O), while multi-sulfate sulfoaluminate hydrates (3CaOAl₂O₃3CaSO₄32H₂O) is the least vulnerable to carbonation, followed by silicate hydrates (5CaO6SiO₂5.5H₂O). The findings in this paper are significant in understanding thermodynamic mechanism of cement hydrates carbonation and seeking the solution to prevent cement hydrates from carbonation-induced deterioration.

• Periodical: Advanced Materials Research (Volumes 753-755)
• Pages: 543-557
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.753-755.543
• Online since: August 2013
• Authors: Yan Jun Liu, Bo Tian Chen, Yong Chao Zheng
• Keywords: Carbon Dioxide Pressure, Carbonation, Cement Hydration Products, Gibbs Free Energy, Reinforcement Corrosion, Temperature, Thermodynamic

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