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A platform for research: civil engineering, architecture and urbanism
Testing of freeze-thaw resistance portland cement compositions by low temperature dilatometry
Concreting during the of winter necessitates the knowledge of the beginning of ice formation and extension strain. In this study the chemistry of cement hardening processes is investigated and the frost-resistance of cocrete with multifunctional complex anti-freeze admixtures at negative temperatures was measured by low-temperature dilatometry. The temperature of the beginning of ice formation and extension strain of rapid solidification mortars and concrete depending on water-cement ratio, grade of cements and amount of anti-freeze admixtures were determined. The reason for the difference lies in the nature of alkali metal salts on the structure forming processes in Portland cement and concrete resistance at negative and signchangeable temperatures were elucidated by measuring the time of setting of ordinary and gypsum-free Portland cements. Whereas NaCl, NaNO3, NaNO2 do not affect the setting behavior, sodium carbonate and silicate as well as potassium salts resulted in a sharp acceleration of the setting and the loss of th plastic properties in the system . The destructive role of gypsum dihydrate in Portland cement containing carbonates, silicates, sulphates and potassium was established.
Testing of freeze-thaw resistance portland cement compositions by low temperature dilatometry
Concreting during the of winter necessitates the knowledge of the beginning of ice formation and extension strain. In this study the chemistry of cement hardening processes is investigated and the frost-resistance of cocrete with multifunctional complex anti-freeze admixtures at negative temperatures was measured by low-temperature dilatometry. The temperature of the beginning of ice formation and extension strain of rapid solidification mortars and concrete depending on water-cement ratio, grade of cements and amount of anti-freeze admixtures were determined. The reason for the difference lies in the nature of alkali metal salts on the structure forming processes in Portland cement and concrete resistance at negative and signchangeable temperatures were elucidated by measuring the time of setting of ordinary and gypsum-free Portland cements. Whereas NaCl, NaNO3, NaNO2 do not affect the setting behavior, sodium carbonate and silicate as well as potassium salts resulted in a sharp acceleration of the setting and the loss of th plastic properties in the system . The destructive role of gypsum dihydrate in Portland cement containing carbonates, silicates, sulphates and potassium was established.
Testing of freeze-thaw resistance portland cement compositions by low temperature dilatometry
Sanitsky, M.A. (author) / Melnyk, V.M. (author) / Loza, M.Z. (author) / Shichnenko, I.V. (author)
1997
8 Seiten, 2 Bilder, 6 Quellen
Conference paper
English
Portlandzement , dynamische Prüfung , Frostbeständigkeit , Einfrieren , Dilatometrie , Zusatzstoff , Beton , chemische Zusammensetzung , Wasser , Wasser-Zement-Wert , Taupunkt , Verarbeitungsbereich , Weichmacher , Wasserabbinden von Zement , Elastizitätsmodul , mechanische Festigkeit , anorganisches Salz , hydraulisches Ansteifen , Natriumcarbonat , Natriumsilicat , Abbindebeschleuniger , Gips , Frostschutzmittel , Eisbildung
Testing of freeze-thaw resistance portland cement compositions by low temperature dilatometry
| British Library Conference Proceedings | 1997
Freeze-Thaw Resistance of Field and Laboratory Produced Portland Cement Pervious Concrete
| British Library Conference Proceedings | 2016