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Changes of thermal events of macrodefect-free (MDF) cements due to the deterioration in the moist atmosphere
Sulfoaluminate ferrite belite (SAFB) clinker premixed with Portland cement in mass ratio 85:15 was combined with hydroxypropylmethyl cellulose (HPMC) or sodium poly-phosphate (poly-P) for the macrodefect-free (MDF) process and subsequent moisture treatment. Mass changes as the measure of the moisture resistance and thermoanalytical traces of MDF cements gave useful information. The mass change depends more on the humidity than on the composition (polymer and inorganic constituents) of the MDF cement or duration of the original MDF cement synthesis. The values of mass changes at 100% relative humidity (RH) and at ambient conditions are affected by the nature of the polymer, poly-P being highly advantageous. Attack by environmental water and carbon dioxide increases the contents of C4 (A,F)S over bar H12(AFm) and CaCO3, represented by thermogravimetry (TG) effects at 250 degree C and differential thermal analysis (DTA) peaks at 600-700 degree, respectively. In contrast, the quantity of cross-linking, where the decomposition of Al(Fe)-O-C(P) bonds typically produces TG-DTA effects at 250-550 degree C, remains intact during the moisture attack.
Changes of thermal events of macrodefect-free (MDF) cements due to the deterioration in the moist atmosphere
Sulfoaluminate ferrite belite (SAFB) clinker premixed with Portland cement in mass ratio 85:15 was combined with hydroxypropylmethyl cellulose (HPMC) or sodium poly-phosphate (poly-P) for the macrodefect-free (MDF) process and subsequent moisture treatment. Mass changes as the measure of the moisture resistance and thermoanalytical traces of MDF cements gave useful information. The mass change depends more on the humidity than on the composition (polymer and inorganic constituents) of the MDF cement or duration of the original MDF cement synthesis. The values of mass changes at 100% relative humidity (RH) and at ambient conditions are affected by the nature of the polymer, poly-P being highly advantageous. Attack by environmental water and carbon dioxide increases the contents of C4 (A,F)S over bar H12(AFm) and CaCO3, represented by thermogravimetry (TG) effects at 250 degree C and differential thermal analysis (DTA) peaks at 600-700 degree, respectively. In contrast, the quantity of cross-linking, where the decomposition of Al(Fe)-O-C(P) bonds typically produces TG-DTA effects at 250-550 degree C, remains intact during the moisture attack.
Changes of thermal events of macrodefect-free (MDF) cements due to the deterioration in the moist atmosphere
Drabik, M. (author) / Mojumdar, S.C. (author) / Galikova, L. (author)
Cement and Concrete Research ; 31 ; 743-747
2001
5 Seiten, 16 Quellen
Article (Journal)
English
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