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The role of calcium ions and lignosulphonate plasticiser in the hydration of cement
Experiments involving equilibrium dialysis, conductivity, X-ray diffraction analysis (XRD), differential thermal analysis (DTA) and isothermal titration calorimetry (ITC) have been carried out to investigate the role of calcium ions and polymeric plasticisers in cement/admixture hydration. Results from a study of lignosulphonic acid, sodium salt, acetate as a plasticiser shows that a plasticiser has dual role; one mainly as a kinetic inhibitor (poison) in cement hydration mechanism and the other as a dispersant. Evidence of a weak Ca 2+ binding to lignosulphonate sulphonic moieties was found at low ionic strengths of 0.1 M using ITC. No evidence of formal Ca2+ binding to lignosulphonate sulphonic acid moieties was found using equilibrium dialysis at higher ionic strength of 1 M (ionic strengths of 0.4 M are typically found in Portland cement pore solution), as is often suggested in cement/admixture literature.
The role of calcium ions and lignosulphonate plasticiser in the hydration of cement
Experiments involving equilibrium dialysis, conductivity, X-ray diffraction analysis (XRD), differential thermal analysis (DTA) and isothermal titration calorimetry (ITC) have been carried out to investigate the role of calcium ions and polymeric plasticisers in cement/admixture hydration. Results from a study of lignosulphonic acid, sodium salt, acetate as a plasticiser shows that a plasticiser has dual role; one mainly as a kinetic inhibitor (poison) in cement hydration mechanism and the other as a dispersant. Evidence of a weak Ca 2+ binding to lignosulphonate sulphonic moieties was found at low ionic strengths of 0.1 M using ITC. No evidence of formal Ca2+ binding to lignosulphonate sulphonic acid moieties was found using equilibrium dialysis at higher ionic strength of 1 M (ionic strengths of 0.4 M are typically found in Portland cement pore solution), as is often suggested in cement/admixture literature.
The role of calcium ions and lignosulphonate plasticiser in the hydration of cement
Grierson, L.H. (author) / Knight, J.C. (author) / Maharaj, R. (author)
Cement and Concrete Research ; 35 ; 631-636
2005
6 Seiten, 22 Quellen
Article (Journal)
English
Hydratisieren , Reaktionskinetik , Thermodynamik , Isotherme , Titration , Röntgenbeugung , Röntgenanalyse , Differenzialthermoanalyse , Kalorimetrie , Calciumverbindung , Berechnung , Calciumnitrat , Temperaturmessung , Lignosulfonat , Plastifiziermittel , Portlandzement , Wasserabbinden von Zement
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