Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Characterization of reactive MgO-modified calcium sulfoaluminate cements upon carbonation
Abstract This study characterizes reactive MgO-modified calcium sulfoaluminate (CSA) cement upon carbonation. Paste samples were fabricated by replacing CSA cement with reactive MgO at levels of 0, 5, 10, and 20 wt%. The samples were cured for 56 days and further cured at a CO2 concentration of 3% for 28 days. MgO incorporation into the CSA cement favored the formation of monosulfate over ettringite. Externally supplied MgO in the CSA cement reduced Al uptake in C-A-S-H and formed hydrotalcite as a secondary phase, which is associated with a reduction in the carbonation degree. In addition, the incorporated MgO inhibited the carbonation of ettringite and monosulfate, while more C-A-S-H and aluminum hydroxide were formed in neat CSA cement upon carbonation, showing the nearly full decomposition of ettringite and monosulfate. The tetrahedral Al network of the MgO-modified sample was not altered upon carbonation, indicating that MgO modified the route of carbonation.
Characterization of reactive MgO-modified calcium sulfoaluminate cements upon carbonation
Abstract This study characterizes reactive MgO-modified calcium sulfoaluminate (CSA) cement upon carbonation. Paste samples were fabricated by replacing CSA cement with reactive MgO at levels of 0, 5, 10, and 20 wt%. The samples were cured for 56 days and further cured at a CO2 concentration of 3% for 28 days. MgO incorporation into the CSA cement favored the formation of monosulfate over ettringite. Externally supplied MgO in the CSA cement reduced Al uptake in C-A-S-H and formed hydrotalcite as a secondary phase, which is associated with a reduction in the carbonation degree. In addition, the incorporated MgO inhibited the carbonation of ettringite and monosulfate, while more C-A-S-H and aluminum hydroxide were formed in neat CSA cement upon carbonation, showing the nearly full decomposition of ettringite and monosulfate. The tetrahedral Al network of the MgO-modified sample was not altered upon carbonation, indicating that MgO modified the route of carbonation.
Characterization of reactive MgO-modified calcium sulfoaluminate cements upon carbonation
Seo, Joonho (Autor:in) / Yoon, H.N. (Autor:in) / Kim, Seonhyeok (Autor:in) / Wang, Zhen (Autor:in) / Kil, Taegeon (Autor:in) / Lee, H.K. (Autor:in)
07.05.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Carbonation of calcium sulfoaluminate mortars
| Elsevier | 2017
MINERALIZER FOR CALCIUM SULFOALUMINATE TERNESITE CEMENTS
| Europäisches Patentamt | 2016
MINERALIZER FOR CALCIUM SULFOALUMINATE TERNESITE CEMENTS
| Europäisches Patentamt | 2018
Themed issue on Calcium Sulfoaluminate Cements
| TIBKAT | 2019
FLUXES/MINERALIZERS FOR CALCIUM SULFOALUMINATE CEMENTS
| Europäisches Patentamt | 2016