EN 998-1 performance requirements for thermal aerogel-based renders. (10th August 2018)

• Record Type: Journal Article
• Authors: Soares, António; de Fátima Júlio, Maria; Flores-Colen, Inês; Ilharco, Laura M.; Brito, Jorge de
• Is Part Of: Construction & building materials. Volume 179(2018)
• Page Start: 453
• Page End: 460
• Publication Date: 2018-08-10
• Subjects: Aerogel -- Renders -- Porous structure -- Performance -- EN 998-1 -- Thermal insulation; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.05.197
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Performance of renders with aerogel and cement-fly ash. Relevant properties for thermal renders required by EN 998-1 standard. Correlation of renders performance and two hybrid silica aerogels. Key parameters: aerogel pore structure and hydrophobicity. Abstract: Given that silica-based aerogels are appealing nanomaterials as aggregates in thermal renders, two types of hybrid silica aerogels were selected to produce cement-fly ash renders classified as T1, with category CSI in compressive strength, and acceptable water behavior (capillary absorption and moisture vapour transmission). The work highlights the relevance of understanding how each characteristic of the aggregate influences the behaviour of the final render, focusing on EN 998-1 requirements. Correlations between pore and molecular structure of the hybrid aerogels and the corresponding standard properties (compressive strength, capillary absorption and moisture vapour transmission) of the renders are discussed for further improvement of the renders' overall performance.