Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of activation temperature on reaction kinetics in recycled clay waste-calcium hydroxide systems
Obtaining pozzolanic materials from recycling of industrial waste and byproducts is a priority action of environmental policy all over the world. This paper describes the effect of activation conditions on the reaction kinetics in calcined clay waste (CCW)/calcium hydroxide systems. The CCW used in this work shows excellent qualities for use as supplementary cementing material in the manufacture of commercial blended cements. This research work presents an exhaustive study about the kinetics of a pozzolanic reaction in this cementing system. The results obtained by different techniques (DTA/TG, X-ray diffraction, and SEM/EDAX) confirm that the activation con- ditions (in the range 700 to 800 deg C and 2 to 5 h of retention) have a direct effect on the formation and evolution of hydrated phases. Low activation temperatures favor the CSH gels' formation, while at higher temperatures aluminates (C4AH13) and aluminum silicate hydrates (C4ASH8, hydrotalcites) are predominant.
Influence of activation temperature on reaction kinetics in recycled clay waste-calcium hydroxide systems
Obtaining pozzolanic materials from recycling of industrial waste and byproducts is a priority action of environmental policy all over the world. This paper describes the effect of activation conditions on the reaction kinetics in calcined clay waste (CCW)/calcium hydroxide systems. The CCW used in this work shows excellent qualities for use as supplementary cementing material in the manufacture of commercial blended cements. This research work presents an exhaustive study about the kinetics of a pozzolanic reaction in this cementing system. The results obtained by different techniques (DTA/TG, X-ray diffraction, and SEM/EDAX) confirm that the activation con- ditions (in the range 700 to 800 deg C and 2 to 5 h of retention) have a direct effect on the formation and evolution of hydrated phases. Low activation temperatures favor the CSH gels' formation, while at higher temperatures aluminates (C4AH13) and aluminum silicate hydrates (C4ASH8, hydrotalcites) are predominant.
Influence of activation temperature on reaction kinetics in recycled clay waste-calcium hydroxide systems
Einfluss der Aktivierungstemperatur auf die Reaktionskinetik in recycelten Tonabfall-Calciumhydroxid-Systemen
Frias, Moises (Autor:in) / Largo, Olga R. (Autor:in) / Jiminez, Rosario Garcia (Autor:in) / Vegas, Inigo (Autor:in)
Journal of the American Ceramic Society ; 91 ; 4044-4051
2008
8 Seiten, 11 Bilder, 5 Tabellen, 32 Quellen
Aufsatz (Zeitschrift)
Englisch
Zement , Ton (Mineral) , Abfallstoff , Recycling-Gut , Calciumhydroxid , Mehrstoffsystem , Aktivieren , Temperatureinfluss , Reaktionskinetik , puzzolanische Reaktion , Puzzolanzement , Calcinieren , Differenzialthermoanalyse , Thermogravimetrie , Röntgenbeugung , Rasterelektronenmikroskopie , energiedispersive Röntgenspektrometrie , Phasenzusammensetzung , Phasenumwandlung , Hydratation , Aluminat , Aluminiumsilicathydrat , chemische Zusammensetzung , Gelbildung , Hydrotalkit , Kristallmorphologie
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