The effectiveness of two amorphous silica based wastes, rice husk ash and volcanic ash powders, used to act as structural reinforcement and partial replacement of metakaolin in porous matrices for thermal isolation was assessed. Both wastes produced colloidal phase that contributed to improve the reactivity and homogeneity of the matrices enhancing the mechanical strength. Rounded pores were obtained in relation with significant reduction of the interpore partitions under controlled addition of the blowing agent. The bulk thermal conductivity decreased from 0.6 to less than 0.15 W m-1 K-1 with the increase of the concentration of blowing agent. The final matrix presented pore size distribution and pore connectivity that allows analytical description and prediction of their effective thermal conductivity.Results demonstrated that clear relations can be established among the viscosity of the pastes, chemical composition, amount of blowing agent and the volume expansion/pore size distribution.

Recycled natural wastes in metakaolin based porous geopolymers for insulating applications / Ngouloure, Zénabou N. M.; Nait Ali, Benoît; Zekeng, S.; Kamseu, Elie; Melo, U. C.; Smith, D.; Leonelli, Cristina. - In: JOURNAL OF BUILDING ENGINEERING. - ISSN 2352-7102. - ELETTRONICO. - 3:(2015), pp. 58-69. [10.1016/j.jobe.2015.06.006]

Recycled natural wastes in metakaolin based porous geopolymers for insulating applications

KAMSEU, Elie;LEONELLI, Cristina
2015

Abstract

The effectiveness of two amorphous silica based wastes, rice husk ash and volcanic ash powders, used to act as structural reinforcement and partial replacement of metakaolin in porous matrices for thermal isolation was assessed. Both wastes produced colloidal phase that contributed to improve the reactivity and homogeneity of the matrices enhancing the mechanical strength. Rounded pores were obtained in relation with significant reduction of the interpore partitions under controlled addition of the blowing agent. The bulk thermal conductivity decreased from 0.6 to less than 0.15 W m-1 K-1 with the increase of the concentration of blowing agent. The final matrix presented pore size distribution and pore connectivity that allows analytical description and prediction of their effective thermal conductivity.Results demonstrated that clear relations can be established among the viscosity of the pastes, chemical composition, amount of blowing agent and the volume expansion/pore size distribution.
2015
3
58
69
Recycled natural wastes in metakaolin based porous geopolymers for insulating applications / Ngouloure, Zénabou N. M.; Nait Ali, Benoît; Zekeng, S.; Kamseu, Elie; Melo, U. C.; Smith, D.; Leonelli, Cristina. - In: JOURNAL OF BUILDING ENGINEERING. - ISSN 2352-7102. - ELETTRONICO. - 3:(2015), pp. 58-69. [10.1016/j.jobe.2015.06.006]
Ngouloure, Zénabou N. M.; Nait Ali, Benoît; Zekeng, S.; Kamseu, Elie; Melo, U. C.; Smith, D.; Leonelli, Cristina
File in questo prodotto:
File Dimensione Formato  
Journal of Building Engineering 3 2015 58–69.pdf

Accesso riservato

Descrizione: Articolo pubblicato
Tipologia: Versione pubblicata dall'editore
Dimensione 3.32 MB
Formato Adobe PDF
3.32 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
1106447.pdf

Open Access dal 05/07/2017

Tipologia: Versione dell'autore revisionata e accettata per la pubblicazione
Dimensione 150.83 kB
Formato Adobe PDF
150.83 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1106447
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 41
  • ???jsp.display-item.citation.isi??? 40
social impact