Universitaet Dortmund

Universität Dortmund

Armin Just

Bernhard Middendorf

Juergen Neisecke

Jürgen Neisecke

The invention relates to an expanded concrete composed of binder-containing mixtures, preferably having binders composed of Portland cement as specified in DIN EN 197 or of mixtures of hydraulic, latent-hydraulic and/or pozzolanic binders, having binders, water with a fraction of 20-60% by mass based on the mass of the binder in the mixture, chemical gas-forming agent, preferably in the form of aluminum powder, at 0.05-0.25% by mass, based on the mass of the binder, for forming mostly air pores in the expanded concrete, wherein the gas-forming agent in the form of a powder forms a mixture of different particle sizes, concrete additives such as in particular microsilica and/or flyash with a fraction of 0.5-25% by mass, based on the mass of the binder, concrete admixtures of mostly liquefying character and at a fraction of 0.5-5% by mass, based on the mass of the binder, wherein the distribution of the air pores of different sizes in the matrix of the expanded concrete, depending on its consistency, makes possible a compressive strength up to 30 N/mmafter curing, and the expanded concrete is air-curing at atmospheric pressure under normal ambient temperature. In addition, a method is proposed of producing such an expanded concrete, and also a test method of determining the fresh concrete properties of an expanded concrete according to the invention.

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Dortmund, Germany

Armin Just