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Sustainability 2014, 6(9), 5839-5852; doi:10.3390/su6095839

Development of Innovative Aerogel Based Plasters: Preliminary Thermal and Acoustic Performance Evaluation

1
Department of Industrial Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia (PG), Italy
2
Agosti Nanotherm s.r.l., Via San Giacomo 23, 39055 Laives (BZ), Italy
*
Author to whom correspondence should be addressed.
Received: 4 June 2014 / Revised: 13 August 2014 / Accepted: 26 August 2014 / Published: 1 September 2014
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Abstract

The thermal and acoustic properties of innovative insulating systems used as building coatings were investigated: Granular silica aerogel was mixed with natural plaster in different percentages. This coating solution is transpiring and insulating, thanks to the use of a natural lime coat and aerogel, a highly porous light material with very low thermal conductivity. The thermal conductivity of the proposed solution was evaluated by means of a Heat Flow meter apparatus (EN ISO 12667), considering different percentages of aerogel. The natural plaster without aerogel has a thermal conductivity of about 0.50 W/m K; considering a percentage of granular aerogel of about 90% in volume, the thermal conductivity of the insulating natural coating falls to 0.050 W/m K. Increasing the percentage of granular aerogel, a value of about 0.018–0.020 W/m K can be reached. The acoustic properties were also evaluated in terms of the acoustic absorption coefficient, measured by means of a Kundt’s Tube (ISO 10534-2). Two samples composed by a plasterboard support, an insulation plaster with aerogel (thicknesses 10 mm and 30 mm respectively) and a final coat were assembled. The results showed that the absorption coefficient strongly depends on the final coat, so the aerogel-based plaster layer moderately influences the final value. The application of this innovative solution can be a useful tool for new buildings, but also for the refurbishment of existing ones. This material is in development: until now, the best value of the thermal conductivity obtained from manufacturers is about 0.015 W/m K. View Full-Text
Keywords: aerogel based plasters; silica aerogel; thermal and acoustic performance; refurbishment of buildings aerogel based plasters; silica aerogel; thermal and acoustic performance; refurbishment of buildings
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Buratti, C.; Moretti, E.; Belloni, E.; Agosti, F. Development of Innovative Aerogel Based Plasters: Preliminary Thermal and Acoustic Performance Evaluation. Sustainability 2014, 6, 5839-5852.

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