Annotation

Ensuring energy efficiency for residential and public buildings is an important issue. It changes the principles of building design and the construction. And it is also directed to optimize the construction time, ensuring the efficient technical and economic indices, to reduce the number of materials, which are used for the structural components of the buildings, without the diminution of their necessary bearing capacity. Those principles can be ensured during the efficient use of the structural elements that are created by combining different building materials with various physical-mechanical, sound-proof, and heat-insulating properties. The innovative types of building structural elements, which will completely satisfy the modern demands for the residential and public buildings, are the layered reinforced concrete – foam concrete floor slabs. The floor slabs are created of different building materials – normal concrete, reinforcement rod, and non-autoclave foam concrete (non-autoclave foam concrete with fiber). The layered reinforced concrete – foam concrete floor slab is structurally formed from the totality of the upper and lower longitudinal beams (these beams are created from the layer of normal concrete and spatial reinforcing cage) between which the layer of the non-autoclave foam concrete (non-autoclave foam concrete with fiber) is arranged. The well-founded indices of the energy efficiency of the layered reinforced concrete – foam concrete floor slabs were received for the practical use of these slabs. The heat transfer resistance of the layered reinforced concrete – foam concrete floor slabs was accepted as a criterion of energy efficiency. The layered reinforced concrete – foam concrete floor slabs with the next geometrical parameters: the width of the upper and lower longitudinal beams is 500 mm; the height of all layered reinforced concrete – foam concrete floor slab is 200 mm, 220 mm, and 240 mm; the height of the layer of normal concrete is 40 mm, 45 mm, 50 mm (the height of floor slab is 200 mm); 45 mm, 50 mm, 55 mm (the height of floor slab is 220 mm) and 50 mm, 55 mm, 60 mm (the height of floor slab is 240 mm) were investigated. The heat transfer resistance of the investigated layered floor slabs was received equal to 0.91…0.52 (m2 · К)/W) depending on the height of floor slabs, the height of the layer of normal concrete in upper and lower longitudinal beams, and the designed grade of the non-autoclave foam concrete by the density. The proposed constructions of floor slabs during their use in residential and public buildings simultaneously ensure the necessary bearing capacity and the execution of sufficiently high modern demands about energy-saving and ecological compatibility.