Особенности применения напыляемой гидроизоляции мостовых сооружений при пониженных температурах

Abstract

The paper concerns the mechanism of bugholes formation (breach) in the waterproofing layer on the slope of the macro-roughness protrusion associated with the temperature and flow rate of the sprayed mixture, cooling time, width, and height of the macro-roughness protrusion. The point bugholes formation occurs on the slopes of areas with maximum irregularities (the greatest depth of the depression relative to the adjacent ledge). Taking into account the results of the production experiment, the research recommends ones to increase the temperature of the sprayed mixture to 70-80 °C to ensure the polymerization rate of the mixture up to 1-2 minutes. Meanwhile, the bubble of the vapor-air mixture does not have time to reach the surface of the sprayed layer and burst with the formation of a bugholes (a defect in the integrity of the waterproofing layer of the bridge structure). The paper shows the prospects of mass application of sprayed polymer three layer waterproofing of bridge structures and the accumulation of new theoretical knowledge in the construction and repairing of bridges.