Publikacje

Abstract:

The article discusses the thermal insulation properties of autoclaved concretes. The thermal insulation of building materials, and in particular the materials forming external partitions, is an important factor in reducing heat loss from the building, and thus improves the economic situation of the investor (lower costs for heating the building), contributes to the improvement of environmental conditions (lower energy consumption) and is now part of the in the issues of sustainable construction. Autoclaved aerated concrete (ACC) is a very good material with thermal insulation properties. Depending on the bulk density and humidity, aerated concrete has a very favorable thermal conductivity. This fact is of particular importance when designing the optimal value of the Umax heat transfer coefficient, which, according to the standard, for single-layer partitions should be a maximum of 0.5 W/(m2 · K), for multi-layer partitions 0.3 W/(m2·K). In 2021, the aim is for the Umax coefficient for insulated building partitions (construction material + insulation) to be 0.2 W/(m2·K). In order to determine the geometry, size and distribution of pores, the density of concrete samples was measured, the porosity test and the Micro CT analysis (industrial computed tomography) was performed. The tests showed the presence of pores with a size of 0.1 ÷ 100 μm, and the volume of voids in the material was estimated at approximately 50% (RD1 52.53%; RD2 47.33%; RD3 55.06%; RD4 55.16%). As part of the research on the internal structure of the material, the following analyzes were performed: XRF, XRD and SEM with an EDS analyzer.

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Insulated Autoclaved Cellular Concretes and Improvement of Their Mechanical and Hydrothermal Properties