Influence of limestone on the hydration of Portland cements
By B. Lothenbach, G. Saoût, E. Gallucci, Karen L. Scrivener. 2008
1,592 citations recorded by the source corpus.
The influence of the presence of limestone on the hydration of Portland cement was investigated. Blending of Portland cement with limestone was found to influence the hydrate assemblage of the hydrated cement. Thermodynamic calculations as well as experimental observations indicated that in the presence of limestone, monocarbonate instead of monosulfate was stable. Thermodynamic modelling showed that the stabilisation of monocarbonate in the presence of limestone indirectly stabilised ettringite leading to a corresponding increase of the total volume of the hydrate phase and a decrease of porosity. The measured difference in porosity between the "limestone-free" cement, which contained less than 0.3% CO2, and a cement containing 4% limestone, however, was much smaller than calculated. Coupling of thermodynamic modelling with a set of kinetic equations which described the dissolution of the clinker, predicted quantitatively the amount of hydrates. The quantities of ettringite, portlandite and amorphous phase as determined by TGA and XRD agreed well with the calculated amounts of these phases after different periods of time. The findings in this paper show that changes in the bulk composition of hydrating cements can be followed by coupled thermodynamic models. Comparison between experimental and modelled data helps to understand in more detail the dominating processes during cement hydration.
Subfields: Civil and Structural Engineering, Ocean Engineering
View Paper: https://www.semanticscholar.org/paper/5cf4da87b369c5c2a10c71a3c9e21ed66714e21c
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Citations in the corpus
- Influence of limestone on the hydration of ternary slag cements (2017, background): “While the concentrations of calcium 340 and sulphates fell with hydration time, the pH increased, consistent with previously 341 reported data [11, 32].”
- Controlling the reaction kinetics of sodium carbonate-activated slag cements using calcined layered double hydroxides (2016, background): “3A) CLDH addition decreased over time, and the calcium monocarboaluminate (C4AcH11, PDF#00-036-0377, ‘monocarbonate’) phase starts to form [33,39,43,44], predicted to be the stable AFm product in thermodynamic modelling of slag activation by Na2CO3 [45].”
- Thermodynamic equilibrium calculations in cementitious systems (2010, methodology): “3% CO2) [9], are indicated by dots Materials and Structures (2010) 43:1413–1433 1427”
- Seeding Effect of Nano-CaCO3 on the Hydration of Tricalcium Silicate (2010, background): “additional surface provided by the addition of micro-CaCO3 promoted the nucleation and growth of the hydration products (6).”
- Hydration and strength development in ternary portland cement blends containing limestone and fly ash or metakaolin (2013, background): “9c, a distinct peak around 180 C corresponding to the carboaluminate phases [11,31] is observed.”