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

Sustainability

Cinzia Buratti¹  Elisa Moretti¹  Elisa Belloni¹ 

[1] Department of Industrial Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia (PG), Italy; E-Mails:

关键词: aerogel based plasters;    silica aerogel;    thermal and acoustic performance;    refurbishment of buildings;   

DOI  :  10.3390/su6095839

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.