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The paper describes the study on the operational properties of lightweight composite with density of 150-350 kg/m 3 . It was established that these properties depend on the ratio of porous cement matrix and inclusions of crushed expanded polystyrene packing tare waste per unit volume of the lightweight composite. Studies have demonstrated that when the density of lightweight composite varies in the above mentioned limits, the compressibility amounts to 2.4-0.8 mm, point load -0.38-3.39 kN, dynamic stiffness -35-135 MN/m 3 , and reduction in normalised impact sound pressure level -26-17 dB. The dependences between the established properties and the density of lightweight composite are showed in the equations of regression. Possible versions for the use of lightweight composite in different constructions of floors and roofs are also provided.

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Enclosures that had been built from elements of autoclaved aerated concrete (AAC) often are covered with plasters. Some adhesion problems between plasters and surface exist during the mechanized covering of surfaces of the mentioned enclosures with plaster. Some dispersible additives (vinyl acetate polymer or derivatives of acrylic acid esters) are used to improve the adhesion. Another problem is the increased water absorption of AAC elements, therefore water retarding additives (cellulose esters) are used in the mixture of plasters. Due to insufficient amount of water in the mixture of plasters, the hydration of cement minerals slows down.

DOI: http://dx.doi.org/10.5755/j01.ms.19.2.4441