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Article


Title

Research Development in Silica Aerogel Incorporated Cementitious Composites—A Review

Authors

[ 1 ] Instytut Budownictwa, Wydział Inżynierii Lądowej i Transportu, Politechnika Poznańska | [ 2 ] Instytut Technologii i Inżynierii Chemicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ P ] employee | [ SzD ] doctoral school student

Scientific discipline (Law 2.0)

[2.6] Civil engineering and transport
[6.5] Chemical sciences

Year of publication

2022

Published in

Polymers

Journal year: 2022 | Journal volume: vol. 14 | Journal number: iss. 7

Article type

scientific article

Publication language

english

Keywords
EN
  • silica aerogel
  • insulating materials
  • lightweight cementitious composites
  • mechanical and insulating properties
  • interfacial transition zone
  • porosity
Abstract

EN This paper presents an analysis of research results for silica aerogel cement composites over the past twenty years. Recently, two trends in the development of these composites have been noted, towards structural applications and towards ultralight composites for coatings and renders. Ongoing research shows that important aspects of cementitious composites with good mechanical performance are the proper selection of aggregates and improved adhesion at the silica aerogel–cement binder interface, which will guarantee high compressive strength with the lowest possible thermal conductivity. The best physicomechanical performance of aerogel cement composites with low thermal conductivity below 0.03 W/(m·K) was obtained when cenospheres and aerogel were used in a weight percentage of 5%. In turn, the prerequisites for using aerogel cement composites as coatings for energy-efficient building façades are the use of large amounts of silica aerogel as a substitute for lightweight aggregates or the selection of an optimal composition of lightweight aggregates and aerogel, ensuring the lowest possible thermal conductivity coefficient. Other important standpoints are water transport and moisture protection of the silica aerogel-based coatings. Therefore, in recent years, more and more elements of the hygrothermal performance, porosity and durability of silica aerogel cement composites have been developed. The article also points out the weaknesses of the application of silica aerogel in the cement matrix, the most important of which are the lack of adhesion at the boundary of the aerogel–cement binder, the increased porosity of the composite, the high water absorption capacity and the significant decrease in compressive strength with large volumes of silica aerogel. Solving these issues will certainly contribute to the wider applicability of these materials in the construction industry.

Date of online publication

02.04.2022

Pages (from - to)

1456-1 - 1456-19

DOI

10.3390/polym14071456

URL

https://www.mdpi.com/2073-4360/14/7/1456

Comments

Article number: 1456

License type

CC BY (attribution alone)

Open Access Mode

open journal

Open Access Text Version

final published version

Release date

02.04.2022

Date of Open Access to the publication

at the time of publication

Points of MNiSW / journal

100.0

Impact Factor

4.329 [List 2020]

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