Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Performance improvement of Portland-limestone cement by mechanochemical activation
Abstract This study investigates mechanochemical activation with alkanolamine-based agents for improving the material performance of Portland-Limestone Cement (PLC). By using 0.1 wt% of diethanolisopropanolamine during grinding process, a noticeable improvement of compressive strength (>100 % increase in 28 days) was confirmed for PLC containing 20 % limestone due to the favorable interaction between the diethanolisopropanolamine and limestone. Grinding in the presence of diethanolisopropanolamine (1) enlarges the specific surface area when limestone is added, (2) stabilizes ettringite, (3) enhances hydration of ferrite, and (4) leads to form denser hydration products. The hydration of mechanochemically treated cement lowers the formation of portlandite with preferred orientation in (001) direction and leads to more formation of amorphous and AFm phases, independent of the presence of limestone. The limestone powder in mechanochemically activated PLC enhances the ferrite dissolution and the production of monocarbonate, which contributes to the significant improvement of compressive strength.
Performance improvement of Portland-limestone cement by mechanochemical activation
Abstract This study investigates mechanochemical activation with alkanolamine-based agents for improving the material performance of Portland-Limestone Cement (PLC). By using 0.1 wt% of diethanolisopropanolamine during grinding process, a noticeable improvement of compressive strength (>100 % increase in 28 days) was confirmed for PLC containing 20 % limestone due to the favorable interaction between the diethanolisopropanolamine and limestone. Grinding in the presence of diethanolisopropanolamine (1) enlarges the specific surface area when limestone is added, (2) stabilizes ettringite, (3) enhances hydration of ferrite, and (4) leads to form denser hydration products. The hydration of mechanochemically treated cement lowers the formation of portlandite with preferred orientation in (001) direction and leads to more formation of amorphous and AFm phases, independent of the presence of limestone. The limestone powder in mechanochemically activated PLC enhances the ferrite dissolution and the production of monocarbonate, which contributes to the significant improvement of compressive strength.
Performance improvement of Portland-limestone cement by mechanochemical activation
Lee, Jihoon (Autor:in) / Lothenbach, Barbara (Autor:in) / Moon, Juhyuk (Autor:in)
17.12.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Limestone Additions to Portland Cement
| British Library Conference Proceedings | 1993
Accelerated Carbonation of Portland Limestone Cement
| British Library Online Contents | 2014