RT Journal Article
T1 Anhydrite/aerogel composites for thermal insulation
A1 Sanz Pont, Daniel
A1 Sanz Arauz, David
A1 Bedoya, César
A1 Flat, Robert
A1 López De Andrés, María Sol
AB 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.
PB Springer
SN 1359-5997 ; Essn: 1871-6873
YR 2016
FD 2016-09
LK https://hdl.handle.net/20.500.14352/18909
UL https://hdl.handle.net/20.500.14352/18909
LA eng
DS Docta Complutense
RD 13 abr 2025