Anhydrite/aerogel composites for thermal insulation



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Sanz Pont, Daniel and Sanz Arauz, David and Bedoya, César and Flat, Robert and López Andrés, Sol (2016) Anhydrite/aerogel composites for thermal insulation. Materials and Structures, 49 (9). pp. 3647-3661. ISSN 1359-5997 ; Essn: 1871-6873

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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.

Item Type:Article
Uncontrolled Keywords:Aerogel; Surfactant; Anhydrite; Composite; SEM; Thermal insulation
Subjects:Sciences > Geology > Mineralogy
ID Code:58008
Deposited On:05 Dec 2019 17:07
Last Modified:09 Jun 2020 11:11

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