Příprava a ověření vlastností lehčených žáromateriálů

Abstract

This work deals with preparation and verification of properties of aluminosilicates lightweight refractory materials. The first part is focused on thermal and thermomechanical properties of refractory materials, which include heat resistance, dimensional stability, resistance to deformation in the heat, thermal conductivity, thermal expansion and more. Further, the refractory materials are classified according to their shape: shape and unshaped materials, lightweight materials and dense materials and the used materials on materials silisa, fireclay or high alumina. At the end of the theoretical part there is the most common use of these materials in industry and other sectors. The experimental part is focused on physical and mechanical properties of refractory materials. This section describe all the tests made did on samples from concrete which include: network analysis, bulk density, compressive strength, flexural strength and density criteria. Amon the criteria for determining is the density, bulk density, true and apparent porosity and water absorption. The conclusion is a comparation of the above mentioned properties of prepared samples depending on the composition of the mixture from which they were prepared on firing temperature, the amount added water and the amount of cement.