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Lightweight alkali-activated composites containing sintered fly ash aggregate and various amounts of silica aerogel


[ 1 ] Instytut Budownictwa, Wydział Inżynierii Lądowej i Transportu, Politechnika Poznańska | [ P ] employee

Scientific discipline (Law 2.0)

[2.7] Civil engineering, geodesy and transport

Year of publication


Published in

Journal of Building Engineering

Journal year: 2023 | Journal volume: vol. 74

Article type

scientific article

Publication language


  • Alkali-activated materials AAMs
  • Ground granulated blast furnace slag GGBFS
  • Silica aerogel
  • Mechanical properties
  • Thermal properties

EN The use of silica aerogel as a replacement for natural aggregate in cement composites makes it possible to obtain a material with a much lower bulk density and a significantly reduced thermal conductivity coefficient. Unfortunately, this usually leads to a decrease in the mechanical performance of the composite due to the deterioration of adhesion between the silica aerogel and the binder. Lowering the thermal conductivity coefficient is also possible by using lightweight aggregate, which is inherently characterized by increased porosity. Therefore, the combined use of lightweight aggregate and silica aerogel can improve the adverse effect of using aerogel alone. The aim of this study was to design composites based on lightweight sintered aggregate and silica aerogel using alkali-activated ground granulated blast furnace slag as binding material. The effects of silica aerogel at 10, 20 and 30 vol% on bulk density, water absorption, flexural and compressive strength, resistance to temperatures of 450 and 1050 °C, were studied. In addition, the thermal conductivity coefficient, thermal diffusivity and volumetric specific heat of the produced composites were determined. Silica aerogel added at 30 vol% resulted in a reduction of the thermal conductivity coefficient from 0.7 to 0.51 W/(m·K) while maintaining compressive strength of 15.2 MPa. In addition, good resistance to elevated temperature was obtained, the composite with the addition of 20 vol% aerogel subjected to 450 °C was characterized by a compressive strength of 17.8 MPa. A higher proportion of silica aerogel and especially a higher exposure temperature resulted in a drastic decrease in mechanical parameters.

Date of online publication


Pages (from - to)

106879-1 - 106879-16





Article Number: 106879

License type

CC BY-NC-ND (attribution - noncommercial - no derivatives)

Open Access Mode

czasopismo hybrydowe

Open Access Text Version

final published version

Date of Open Access to the publication

in press

Ministry points / journal


Impact Factor

6.4 [List 2022]

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