Anhydrite/aerogel composites for thermal insulation

Sanz Pont, Daniel and Sanz Arauz, David and Bedoya Frutos, Cesar and Flatt, Robert J. and López Andrés, Sol (2015). Anhydrite/aerogel composites for thermal insulation. "Materials and Structures", v. 49 (n. 9); pp. 3647-3661. ISSN 1359-5997. https://doi.org/10.1617/s11527-015-0746-8.

Description

Title: Anhydrite/aerogel composites for thermal insulation
Author/s:
  • Sanz Pont, Daniel
  • Sanz Arauz, David
  • Bedoya Frutos, Cesar
  • Flatt, Robert J.
  • López Andrés, Sol
Item Type: Article
Título de Revista/Publicación: Materials and Structures
Date: 2015
ISSN: 1359-5997
Volume: 49
Subjects:
Faculty: E.T.S. Arquitectura (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

High performance thermal insulating composite materials can be produced with mineral binders and hydrophobic aerogel particles through a hydrophilization process for the latter with surfactants. The present study is focused on the development of aerogel/calcium sulfate composites by the hydrophilization of hydrophobic silica aerogel particles through a polymer-based surfactant. Its effects on the microstructure and hydration degree are examined as well as their relation to the resulting mechanical and physical properties. Results show that composites with an around 60 % of aerogel by volume can achieve a thermal conductivity <30 mW/m × K. Interestingly, a surfactant addition of 0.1 % by wt% of the water in the mixtures provides better material properties compared to a surfactant wt% addition of 5 %. However, it has been found around 40 % entrained air, affecting the material properties by reducing the binder and aerogel volume fractions within the composites. Moreover, gypsum crystallization starts to be inhibited at aerogel volume fractions >35 %. Towards material optimization, a model for the calculation of thermal conductivity of composites and an equation for the compressive strength are proposed.

More information

Item ID: 41140
DC Identifier: http://oa.upm.es/41140/
OAI Identifier: oai:oa.upm.es:41140
DOI: 10.1617/s11527-015-0746-8
Official URL: http://link.springer.com/article/10.1617/s11527-015-0746-8
Deposited by: Memoria Investigacion
Deposited on: 23 Jun 2016 11:08
Last Modified: 01 Apr 2020 10:36
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