FORECASTING LIMIT OF FIRE RESISTANCE OF WALLS OF BUILDINGS WITH EXPANSION JOINTS FILLED WITH FIRE-RESISTANT FOAM

The technique of predicting the fire resistance of the expansion joints of walls filled with fire-resistant foam collapsing during thermal exposure of a fire have been made. Expansion joint is a gap between the individual parts of the structure facilities, allowing their relative movement caused by thermal expansion of materials. Expansion joints protect the building from the masonry breaks, cracks, distortions and shifts. Filling of expansion joints by foam made to seal the structure. Existing methods of evaluating the properties of protective material on the basis of a classification test based on the fact that the heating structure increases with the massiveness and attenuated with increasing thickness of the protective layer while maintaining the structural integrity during heat exposure. The developed method is based on the assumptions: 1) for the destruction of equal amounts of foam requires summing equal amounts of heat; 2) heat to the surface of the foam, located in a gap between the walls, mainly due to applied radiation. The data obtained from the developed procedure gives satisfactory agreement with the published literature on the test results.