Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thermal behavior of acidic and alkali activated laterite based geopolymer: a comparative study
Laterite soils account for 70% of Cameroon territory. The present study aims to investigate the thermal behavior of geopolymer from both thermally activated lateritic clay and indurated laterite at 700°C. The resulting calcined powder was consolidated with phosphoric acid (PA) and alkaline solution (AS), and after 28 days of cure, the geopolymer then was heated at 200°C, 400°C, 600°C, 800°C and 1000°C. At room temperature (25°C), applying an acidic medium developed best mechanical performance (85.6 MPa) using highly indurated laterite (CUPA) than clayey-rich laterite (EMPA) that gave 44.86 MPa. Increasing the heating temperature up to 1000°C greatly affected the samples consolidated with an acid solution than with alkaline medium. This suggests the best stability of N-A-S-H than phosphate binder at high temperature. The high performance of acid-activated samples is related to the alteration of iron minerals in acid medium allowing the formation of Fe-O-P bonds, while the decrease in compressive strength with the increase of heating temperature up to 1000°C is related to the dehydroxylation of formed binder phases that weakened the structure.
Thermal behavior of acidic and alkali activated laterite based geopolymer: a comparative study
Laterite soils account for 70% of Cameroon territory. The present study aims to investigate the thermal behavior of geopolymer from both thermally activated lateritic clay and indurated laterite at 700°C. The resulting calcined powder was consolidated with phosphoric acid (PA) and alkaline solution (AS), and after 28 days of cure, the geopolymer then was heated at 200°C, 400°C, 600°C, 800°C and 1000°C. At room temperature (25°C), applying an acidic medium developed best mechanical performance (85.6 MPa) using highly indurated laterite (CUPA) than clayey-rich laterite (EMPA) that gave 44.86 MPa. Increasing the heating temperature up to 1000°C greatly affected the samples consolidated with an acid solution than with alkaline medium. This suggests the best stability of N-A-S-H than phosphate binder at high temperature. The high performance of acid-activated samples is related to the alteration of iron minerals in acid medium allowing the formation of Fe-O-P bonds, while the decrease in compressive strength with the increase of heating temperature up to 1000°C is related to the dehydroxylation of formed binder phases that weakened the structure.
Thermal behavior of acidic and alkali activated laterite based geopolymer: a comparative study
Belinga Essama Boum, Raphael (Autor:in) / Mvondo Owono, Francois (Autor:in) / Kaze, Cyriaque Rodrigue (Autor:in) / Essomba Essomba, Juste Constant (Autor:in) / Souleymanou, Bakary (Autor:in) / Deutou Nemaleu, Juvenal Giogetti (Autor:in) / Ntamak-Nida, Marie Joseph (Autor:in)
Geosystem Engineering ; 25 ; 225-238
02.11.2022
14 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Thermal Properties of Alkali-Activated Geopolymer Composites Incorporating Carbon Nanotubes
| Springer Verlag | 2024
Geopolymer Microstructure and Hydration Mechanism of Alkali-Activated Fly Ash-Based Geopolymer
| British Library Conference Proceedings | 2012
Geopolymer or Alkali Activated Stabilised Earth Bricks
| Springer Verlag | 2022
Underwater anti-dispersion alkali-activated geopolymer concrete
| Europäisches Patentamt | 2021