Scholarly record
THERMOGRAVIMETRIC ANALYSIS OF THE SURFACE COATINGS OF STEEL CONSTRUCTIONS
Abstract
Nowadays, steel constructions and their elements are used for their properties. One of their advantages is, for example, their low weight in comparison with their load capacity. Also, quick assembly is one of their advantages. On the other hand, there are disadvantages which are associated with changes of properties under thermal stress. There are no significant changes up to a temperature of 350°C, but steel loses their load capacity between 500-700 °C [1], [2]. Because of that, in many cases these constructions are treated with the fire-retardant coatings. Fire-retardant coatings are used for their capability to increase their resistance to the effects of heat. For example, Lucherini [3] and his team performed an experimental study with thin intumescent coatings. They monitored the beginning of the coating?s reaction depending on the temperature. In many cases, steel construction is treated only with anticorrosive coatings. An anticorrosive coating protects constructions against the adverse effects of the environment in which they occur. Anticorrosive systems were tested as a fire protection coating by Mensinger and Gaigl [4], [5]. In this case, hot dip galvanized steel elements were exposed to thermal heat. The results proved the improved behaviour of these hot dip galvanized steel elements in comparison with untreated elements or elements with a layer of rust. In our experimental measurement, steel plates were treated with surface treatments according to the manufacturer?s instructions. Several types of coatings in shades of black and white were used for this experiment. Treated steel plates were exposed to different level of heat radiation for 30 minutes. The effects of the thermal load by a radiation component on these selected anticorrosive coatings and steel elements were monitored and evaluated. The temperature and heat flux density was monitored and also visual damage and paint compactness was evaluated. The results proved the different resistance of individual types of paints [6]. Samples of used coatings were prepared and subsequently subjected to thermal analysis for a comprehensive evaluation of the resistance. Thermal analysis is used for monitored processes, for example oxidation, dehydration or other. These processes occur when the test sample is heated or cooled. The thermal analysis is a set of methods which monitored changes in mass, release, or consumption of heat, and other areas, such as a volume changes or the evolution/absorption of gases [7]. Weight loss according to time and increasing temperature was monitored in a thermogravimetric analysis, but a differential scanning calorimetry analysis was also performed. The results confirmed the greatest resistance from a paint named Hempathane. This coating also showed the greatest visual compactness and resistance during the heat load. Depending on the extent of the damage, the level of the thermal load of the steel construction could be assessed in practice.
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References9
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