Thermodynamic modelling of the hydration of Portland cement

Journal Article · Wed Feb 15 04:00:00 EST 2006 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2005.0· OSTI ID:20793269

Lothenbach, Barbara ^[1]; Winnefeld, Frank ^[1]

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1. Empa, Laboratory for Concrete and Construction Chemistry, Uberlandstrasse 129, 8600 Duebendorf (Switzerland)

A thermodynamic model is developed and applied to calculate the composition of the pore solution and the hydrate assemblage during the hydration of an OPC. The calculated hydration rates of the individual clinker phases are used as time dependent input. The modelled data compare well with the measured composition of pore solutions gained from OPC as well as with TGA and semi-quantitative XRD data. The thermodynamic calculations indicate that in the presence of small amounts of calcite typically included in OPC cements, C-S-H, portlandite, ettringite and calcium monocarbonates are the main hydration products. The thermodynamic model presented in this paper helps to understand the interactions between the different components and the environment and to predict the influence of changes in cement composition on the hydrate assemblage.

• OSTI ID: 20793269
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 2 Vol. 36; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCITE
CALCIUM CARBONATES
HYDRATES
HYDRATION
INTERACTIONS
PORTLAND CEMENT
SIMULATION
SOLUTIONS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMIC MODEL
X-RAY DIFFRACTION