A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
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 (editor) / Favier, Aurélie (editor) / Chitvoranund, Natechanok (author) / Lothenbach, Barbara (author) / Sinthupinyo, Sakprayut (author) / Winnefeld, Frank (author)
2015-05-08
7 pages
Article/Chapter (Book)
Electronic Resource
English
Synthesis and hydration of alite-calcium sulfoaluminate cement
| Online Contents | 2016
Synthesis and hydration of alite-calcium sulfoaluminate cement
| Online Contents | 2017
Characterization of Limestone Calcined Clay Cement Made with Calcium Sulfoaluminate Clinker
| Springer Verlag | 2024
Characterization of Limestone Calcined Clay Cement Made with Calcium Sulfoaluminate Clinker
| Springer Verlag | 2024
Study on synthesis and performance of alite-strontium calcium sulfoaluminate cement
| Online Contents | 2012