Gilka-Bötzow, Albrecht ; Folino, Paula ; Maier, Andreas ; Koenders, Eduardus A. B. ; Caggiano, Antonio (2023)
Triaxial Failure Behavior of Highly Porous Cementitious Foams Used as Heat Insulation.
In: Processes, 2021, 9 (8)
doi: 10.26083/tuprints-00019535
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
This work reports a detailed experimental study that is aimed at investigating the failure mechanisms of highly porous cementitious foams used as heat insulation under triaxial stress states. The designed target dry density of the considered foam mixture was 180 kg/m³ by setting the water-to-cement ratio of the considered cement paste to 0.4. The mechanical experiments were accompanied by thermal tests to observe the effect that specific air void structures have on the resulting insulation properties and by micro-to-meso geometric studies to identify and classify the inner structure of the considered mineralized foams. Unconfined compressive strengths were performed first, obtaining peak stresses of 0.252, 0.283, 0.223, and 0.251 (results in MPa), corresponding to peak strains of 39.0, 28.6, 45.3, and 20.6 (in ×10⁻³ mm/mm), respectively. Moreover, three triaxial confinement levels of 33%, 66%, and 90% of the mean uniaxial compressive strength (fc) were adopted. The results showed that a 33% confinement may cause a strength increase and an almost perfect elastic–plastic stress–strain behavior. However, higher levels of confinements (i.e., 66% and 90%) produced very unstable behaviors in terms of the final strength and stress–strain response.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Gilka-Bötzow, Albrecht ; Folino, Paula ; Maier, Andreas ; Koenders, Eduardus A. B. ; Caggiano, Antonio |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Triaxial Failure Behavior of Highly Porous Cementitious Foams Used as Heat Insulation |
| Sprache: | Englisch |
| Publikationsjahr: | 14 November 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2021 |
| Ort der Erstveröffentlichung: | Basel |
| Verlag: | MDPI |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Processes |
| Jahrgang/Volume einer Zeitschrift: | 9 |
| (Heft-)Nummer: | 8 |
| Kollation: | 15 Seiten |
| DOI: | 10.26083/tuprints-00019535 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/19535 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | This work reports a detailed experimental study that is aimed at investigating the failure mechanisms of highly porous cementitious foams used as heat insulation under triaxial stress states. The designed target dry density of the considered foam mixture was 180 kg/m³ by setting the water-to-cement ratio of the considered cement paste to 0.4. The mechanical experiments were accompanied by thermal tests to observe the effect that specific air void structures have on the resulting insulation properties and by micro-to-meso geometric studies to identify and classify the inner structure of the considered mineralized foams. Unconfined compressive strengths were performed first, obtaining peak stresses of 0.252, 0.283, 0.223, and 0.251 (results in MPa), corresponding to peak strains of 39.0, 28.6, 45.3, and 20.6 (in ×10⁻³ mm/mm), respectively. Moreover, three triaxial confinement levels of 33%, 66%, and 90% of the mean uniaxial compressive strength (fc) were adopted. The results showed that a 33% confinement may cause a strength increase and an almost perfect elastic–plastic stress–strain behavior. However, higher levels of confinements (i.e., 66% and 90%) produced very unstable behaviors in terms of the final strength and stress–strain response. |
| Freie Schlagworte: | highly porous cementitious composites, concrete foams, ultralightweight concrete, air voids, poro-(meso)-structure, thermal insulating properties, mechanical characterization |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-195358 |
| Zusätzliche Informationen: | This article belongs to the Special Issue Foam Matrix Composites: Preparation and Application |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 624 Ingenieurbau und Umwelttechnik |
| Fachbereich(e)/-gebiet(e): | 13 Fachbereich Bau- und Umweltingenieurwissenschaften 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Werkstoffe im Bauwesen 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Statik und Konstruktion |
| Hinterlegungsdatum: | 14 Nov 2023 13:36 |
| Letzte Änderung: | 15 Nov 2023 11:05 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Triaxial Failure Behavior of Highly Porous Cementitious Foams Used as Heat Insulation. (deposited 14 Nov 2023 13:36) [Gegenwärtig angezeigt]
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