Comparison of Different Aerogel Granules for Use as Aggregate in Concrete

Author:

Welsch Torsten1ORCID,Vievers Yannick1,Schnellenbach-Held Martina1,Bialuschewski Danny2ORCID,Milow Barbara23ORCID

Affiliation:

1. Institute for Structural Concrete (ISC), University of Duisburg-Essen, 45141 Essen, Germany

2. Institute of Inorganic Chemistry, Nanostructured Cellular Materials, University of Cologne (UoC), 50939 Cologne, Germany

3. German Aerospace Center (DLR), Institute of Materials Research, Aerogels and Aerogel Composites, 51147 Cologne, Germany

Abstract

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.

Publisher

MDPI AG

Subject

Polymers and Plastics,Organic Chemistry,Biomaterials,Bioengineering

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