Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hydration of ferrite-rich Portland cement: Evaluation of Fe-hydrates and Fe uptake in calcium-silicate-hydrates
Highlights Ferrite-Rich Portland cement produces denser microstructure at an early age compared with ordinary Portland cement. Fe-siliceous hydrogarnet is the main Fe-containing phase in the hydrated cement. Fe(III) ions exist as Fe(OH)4 − in the high-pH pore solution. C-S-H adsorbs Fe(OH)4 − via surface complexation reaction and around 2 wt% of Fe incorporated C-S-H [C-(F)-S-H] is produced in the hydrated cement.
Abstract The hydration process in ferrite-rich cement (FC) and its pore structure have been investigated by experimental and thermodynamic modelling techniques. X-ray diffraction (XRD)/Rietveld analysis, thermogravimetry (TG), and mercury intrusion porosimetry (MIP) were performed to study the hydration process, pore volume-pore size distributions, and Fe uptake in calcium-silicate-hydrate (C-S-H). Similar phases were found in both FC and ordinary Portland cement (OPC). The hydration degree of FC was higher at the early stage compared with that of OPC; however, the hydration of OPC exceeded that of FC after 14 days because the high amount of C2S in OPC promoted the late hydration. The XRD-TG results revealed relatively similar Fe uptake by C-S-H in both FC and OPC. The thermodynamic model confirmed the formation of a high amount of Fe phases in FC. Moreover, the model predictions agreed well with the experimental results, demonstrating the accuracy of the proposed model for FC.
Hydration of ferrite-rich Portland cement: Evaluation of Fe-hydrates and Fe uptake in calcium-silicate-hydrates
Highlights Ferrite-Rich Portland cement produces denser microstructure at an early age compared with ordinary Portland cement. Fe-siliceous hydrogarnet is the main Fe-containing phase in the hydrated cement. Fe(III) ions exist as Fe(OH)4 − in the high-pH pore solution. C-S-H adsorbs Fe(OH)4 − via surface complexation reaction and around 2 wt% of Fe incorporated C-S-H [C-(F)-S-H] is produced in the hydrated cement.
Abstract The hydration process in ferrite-rich cement (FC) and its pore structure have been investigated by experimental and thermodynamic modelling techniques. X-ray diffraction (XRD)/Rietveld analysis, thermogravimetry (TG), and mercury intrusion porosimetry (MIP) were performed to study the hydration process, pore volume-pore size distributions, and Fe uptake in calcium-silicate-hydrate (C-S-H). Similar phases were found in both FC and ordinary Portland cement (OPC). The hydration degree of FC was higher at the early stage compared with that of OPC; however, the hydration of OPC exceeded that of FC after 14 days because the high amount of C2S in OPC promoted the late hydration. The XRD-TG results revealed relatively similar Fe uptake by C-S-H in both FC and OPC. The thermodynamic model confirmed the formation of a high amount of Fe phases in FC. Moreover, the model predictions agreed well with the experimental results, demonstrating the accuracy of the proposed model for FC.
Hydration of ferrite-rich Portland cement: Evaluation of Fe-hydrates and Fe uptake in calcium-silicate-hydrates
Noguchi, Natsumi (Autor:in) / Siventhirarajah, Krishnya (Autor:in) / Chabayashi, Takashi (Autor:in) / Kato, Hiroyoshi (Autor:in) / Nawa, Toyoharu (Autor:in) / Elakneswaran, Yogarajah (Autor:in)
21.03.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| Engineering Index Backfile | 1934
| Engineering Index Backfile | 1935
| Online Contents | 2008
| British Library Conference Proceedings | 2008