Light weight gypsum-based material manufactured by expanding process with aluminum powder

. The paper presents the preparing method of a light weight gypsum-based material. The raw material foaming principle is applied to the manufacture of aerated autoclavized concrete by hydrogen release in the material mass by the corrosion reaction of aluminum powder in aqueous solution of Ca(OH) 2 . The work originality is the generation method of powder aluminum by microwave melting of metal waste and melt atomization by concentrated nitrogen jets. The product has density between 530-600 kg/m 3 and compressive strength between 1.2-2.2 MPa, being similar to aerated autoclaved concrete, with identical application fields, but low energy costs.