Thermodynamics and cement science

Damidot, D.; Lothenbach, Barbara; Herfort, Duncan; Glasser, F. P.

doi:10.1016/j.cemconres.2011.03.018

Cited by 217 publications

(141 citation statements)

References 97 publications

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“…Thermodynamic data has shown that the constitution of minor phases, AFm and AFt is very sensitive to temperature and the activity of anions, especially CO 3 2-, SO 4 2-and OH -, and that the resulting distribution of anions is temperature dependent over short temperature ranges, examples are given in the range 0-40°C by Matschei and others [4,13,14].…”

Section: Introductionmentioning

confidence: 99%

Strätlingite: compatibility with sulfate and carbonate cement phases

Okoronkwo

Glasser

2015

Mater Struct

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The silicate AFm, strätlingite, has been shown to be stable in high aluminosilicate cement systems but its stability with respect to the anion content of hydrated Portland cement paste is unknown. The stability of strätlingite in the presence of sulfate and carbonate phases relevant to cement systems are reported. Results show that strätlingite persists at the sulfate activity conditioned by gypsum, ettringite and at carbonate activity conditioned by the presence of calcite, carbonate AFm, or carbonate AFt. Structural incorporation of anions such as carbonate or sulfate in strätlingite was not observed in the temperature range 20-85°C.

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Section: Introductionmentioning

confidence: 99%

Strätlingite: compatibility with sulfate and carbonate cement phases

Okoronkwo

Glasser

2015

Mater Struct

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“…However, efforts focused on the link between mineral alteration and diffusion and less on the detailed chemical interactions between cementitious cations and organic acids. In particular, applying thermodynamics to cement science has proved to be a very valuable approach and has been in use for many decades now [23]. In particular, thermodynamic modelling efficiently supports the assessment of the durability of a cement paste in organic environments.…”

Section: Introductionmentioning

confidence: 99%

“…acetic, citric, oxalic and succinic acids. A first, essential, step was to obtain thermodynamic constants concerning their polyacidity, their organometallic complexes of Al and Ca, and their Ca-salt solubility as the relevance of speciation modelling depends directly on the completeness and quality of the thermodynamic data [23]. Little attention has been paid to organic acid data in cement science, so acid titration was modelled and simplified stability diagrams were drawn up in a second stage.…”

Section: Introductionmentioning

confidence: 99%

Interactions between hydrated cement paste and organic acids: Thermodynamic data and speciation modeling

Windt

Bertron

Larreur-Cayol

et al. 2015

Cement and Concrete Research

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Abstract.Interactions of short-chain organic acids with hydrated cement phases affect structure durability in the agro-food and nuclear waste industries but can also be used to modify cement properties. Most previous studies have been experimental, performed at fixed concentrations and pH, without quantitatively discriminating among polyacidity effects, or complexation and salt precipitation processes. This paper addresses such issues by thermodynamic equilibrium calculations for acetic, citric, oxalic, succinic acids and a simplified hydrated CEM-I. The thermodynamic constants collected from the literature allow the speciation to be modelled over a wide range of pH and concentrations. Citric and oxalic had a stronger chelating effect than acetic acid, while succinic acid was intermediate. Similarly, Ca-citrate and Ca-oxalate salts were more insoluble than Ca-acetate and Ca-succinate salts. Regarding aluminium complexation, hydroxyls, sulphates, and acid competition was highlighted. The exploration of acid mixtures showed the preponderant effect of oxalate and citrate over acetate and succinate.

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“…Além dos benefícios ambientais, a principal contribuição da adição de fino calcário em matrizes cimentícias é dada pelo efeito físico, uma vez que a quantidade de CaCO 3 que pode reagir é limitada pelo teor de sulfato e alumina presente no cimento (DAMIDOT et al, 2011;MATSCHEI;LOTHENBACH;GLASSER, 2007). Segundo Scrivener, Crumbie e Laugesen (2004), a porosidade e a extensão da interface irão depender do tamanho mínimo das partículas presentes na matriz.…”

Section: Introductionunclassified

Efeito do teor e da dispersão de fino calcário na aderência substrato-matriz cimentícia

2016

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Resumoste artigo tem como objetivo avaliar o efeito do teor e da dispersão de partículas de fino calcário em substituição ao ligante para a aderência substrato-matriz cimentícia. Para tal, foram produzidas argamassas com 0%, 30% e 60% de substituição do teor de cimento por fino calcário, de granulometria inferior à do cimento; também foi avaliada a dispersão das partículas pela adição de 0,02% de dispersante à base de policarboxilato às argamassas aplicadas sobre blocos cerâmicos hidrofugados. O comportamento reológico das argamassas, medido por reometria rotacional, variou conforme o teor de fino calcário e o uso de dispersante. Apesar da redução das propriedades mecânicas, a substituição de 60% de ligante por finos calcários combinado ao uso de dispersante pode aumentar a aderência em 76%. O acréscimo de aderência pode ser explicado pelo aumento da área de contato entre a argamassa e o substrato. Essa conclusão é de interesse prático, pois mostra que é possível reduzir a quantidade de ligante da matriz sem afetar sua resistência de aderência. Palavras

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Thermodynamics and cement science

Cited by 217 publications

References 97 publications

Strätlingite: compatibility with sulfate and carbonate cement phases

Strätlingite: compatibility with sulfate and carbonate cement phases

Interactions between hydrated cement paste and organic acids: Thermodynamic data and speciation modeling

Efeito do teor e da dispersão de fino calcário na aderência substrato-matriz cimentícia

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