A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Macrodefect-free cements: Chemistry and impact of the environment
To control and improve the moisture resistance is a long felt necessity of the MDF cements, chemical approaches together with material science contribute to the progress. Present results support our previous hypothesis about the impregnation or barier effect of poly-P on the MDF cements and enlarge the validity of this hypothesis to the blends of SAFB clinker, Portland cement and HPMC or poly-P. Compactness of Al(Fe)-O-P cross-links increases the intrinsic density and, consequently, impregnates the system against the uptake of moisture. In a sense of the theory of functional polymers, the intensity of grafting of polymer chains to the surface of grains increases if poly-P is used and with the prolonged processing. The scope of moisture attack on MDF cements synthesized from the blends of SAFB clinker, Portland cement and HPMC or poly-P, as quantified using mass changes as measure of moisture resistance, is strongly affected by the nature of polymer. The addition of Portland cement in the raw mix improves the moisture resistance of MDF cements. Thermal analysis shows: i) the irreversible mass gain of 3 - 10 % is arisen from carbonation and secondary hydration of cement grains and ii) the Al(Fe)-O-C(P) crosslinks remain intact in the moist environment at either ambient or extreme levels of humidity.
Macrodefect-free cements: Chemistry and impact of the environment
To control and improve the moisture resistance is a long felt necessity of the MDF cements, chemical approaches together with material science contribute to the progress. Present results support our previous hypothesis about the impregnation or barier effect of poly-P on the MDF cements and enlarge the validity of this hypothesis to the blends of SAFB clinker, Portland cement and HPMC or poly-P. Compactness of Al(Fe)-O-P cross-links increases the intrinsic density and, consequently, impregnates the system against the uptake of moisture. In a sense of the theory of functional polymers, the intensity of grafting of polymer chains to the surface of grains increases if poly-P is used and with the prolonged processing. The scope of moisture attack on MDF cements synthesized from the blends of SAFB clinker, Portland cement and HPMC or poly-P, as quantified using mass changes as measure of moisture resistance, is strongly affected by the nature of polymer. The addition of Portland cement in the raw mix improves the moisture resistance of MDF cements. Thermal analysis shows: i) the irreversible mass gain of 3 - 10 % is arisen from carbonation and secondary hydration of cement grains and ii) the Al(Fe)-O-C(P) crosslinks remain intact in the moist environment at either ambient or extreme levels of humidity.
Macrodefect-free cements: Chemistry and impact of the environment
Drabik, M. (author) / Galikova, L. (author) / Mojumdar, S.C. (author)
2001
4 Seiten, 11 Quellen
Conference paper
English
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