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Comparison of Different Aerogel Granules for Use as Aggregate in Concrete

Welsch, Torsten and Vievers, Yannick and Schnellenbach-Held, Martina and Bialuschewski, Danny and Milow, Barbara (2023) Comparison of Different Aerogel Granules for Use as Aggregate in Concrete. Gels. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/gels9050406. ISSN 2310-2861.

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In previous work of this group, a structural lightweight concrete was developed by embedding silica aerogel granules in a high-strength cement matrix. This concrete, called high-performance aerogel concrete (HPAC), is a lightweight building material characterized by its simultaneous high compressive strength and very low thermal conductivity. Besides these features, high sound absorption, diffusion permeability, water repellence and fire resistance qualify HPAC as an interesting material for the construction of single-leaf exterior walls without any further insulation. During the development of HPAC, the type of silica aerogel was found to majorly influence both fresh and hardened concrete properties. To clarify these effects, a systematic comparison of SiO2 aerogel granules with different levels of hydrophobicity as well as different synthesis methods was conducted in the present study. The granules were analyzed for their chemical and physical properties as well as their compatibility in HPAC mixtures. These experiments included determinations of pore size distribution, thermal stability, porosity, specific surface and hydrophobicity, as well as fresh/hardened concrete experiments such as measurements of compressive strength, flexural bending strength, thermal conductivity and shrinking behavior. It was found that the type of aerogel has a major influence on the fresh and hardened concrete properties of HPAC, particularly compressive strength and shrinkage behavior, whereas the effect on thermal conductivity is not very pronounced.

Item URL in elib:https://elib.dlr.de/198364/
Document Type:Article
Title:Comparison of Different Aerogel Granules for Use as Aggregate in Concrete
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Welsch, TorstenUni Duisburg-EssenUNSPECIFIEDUNSPECIFIED
Schnellenbach-Held, MartinaUni Duisburg-EssenUNSPECIFIEDUNSPECIFIED
Bialuschewski, DannyUNSPECIFIEDhttps://orcid.org/0009-0008-1469-2753147000848
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728UNSPECIFIED
Date:May 2023
Journal or Publication Title:Gels
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:aerogel concrete; aerogel granule; compression strength; lightweight aggregate concrete; silica aerogel; thermal insulation.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - FFAE - Fahrzeugkonzepte, Fahrzeugstruktur, Antriebsstrang und Energiemanagement
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Bialuschewski, Danny
Deposited On:20 Nov 2023 10:02
Last Modified:20 Nov 2023 10:02

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