Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Reactivity of Calcined Clay in Alite-Calcium Sulfoaluminate Cement Hydration
Alite-calcium sulfoaluminate (ACSA) cement is a low energy cement which contains both alite (C3S) and ye’elmite (C4A3$). Blending of ACSA with calcined clay would be a possibility to further decrease the CO2 balance of ACSA. Clay with 40–50 % kaolinite content was calcined in a static furnace at 750 °C for 30 min. The pozzolanic reaction of the calcined clay was studied using the reaction between calcite, portlandite and calcined clay under controlled pH conditions (in 0.1 and 0.3 M KOH solutions). The portlandite consumptions up to 7 days were characterized by thermogravimetric analysis (TGA) and used to determine the reaction degree of the calcined clay using thermodynamic modelling. Calcined clay showed a high reactivity during the first days. This initial high reactivity of the clay observed in the pozzolanity test agrees with the results of the ACSA-clay blends obtained by X-ray diffraction and thermogravimetric analysis, where significant portlandite consumption by added clay was observed during the first days of hydration. After 28 days the ACSA blends with 10 % calcined clay show a significant higher compressive strength than the plain ACSA.
Reactivity of Calcined Clay in Alite-Calcium Sulfoaluminate Cement Hydration
Alite-calcium sulfoaluminate (ACSA) cement is a low energy cement which contains both alite (C3S) and ye’elmite (C4A3$). Blending of ACSA with calcined clay would be a possibility to further decrease the CO2 balance of ACSA. Clay with 40–50 % kaolinite content was calcined in a static furnace at 750 °C for 30 min. The pozzolanic reaction of the calcined clay was studied using the reaction between calcite, portlandite and calcined clay under controlled pH conditions (in 0.1 and 0.3 M KOH solutions). The portlandite consumptions up to 7 days were characterized by thermogravimetric analysis (TGA) and used to determine the reaction degree of the calcined clay using thermodynamic modelling. Calcined clay showed a high reactivity during the first days. This initial high reactivity of the clay observed in the pozzolanity test agrees with the results of the ACSA-clay blends obtained by X-ray diffraction and thermogravimetric analysis, where significant portlandite consumption by added clay was observed during the first days of hydration. After 28 days the ACSA blends with 10 % calcined clay show a significant higher compressive strength than the plain ACSA.
Reactivity of Calcined Clay in Alite-Calcium Sulfoaluminate Cement Hydration
RILEM Bookseries
Scrivener, Karen (Herausgeber:in) / Favier, Aurélie (Herausgeber:in) / Chitvoranund, Natechanok (Autor:in) / Lothenbach, Barbara (Autor:in) / Sinthupinyo, Sakprayut (Autor:in) / Winnefeld, Frank (Autor:in)
Calcined Clays for Sustainable Concrete ; Kapitel: 46 ; 373-379
RILEM Bookseries ; 10
08.05.2015
7 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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