Spray-on polymer waterproofing finishing structure for bridge structures, taking into account thermophysical modeling

This article investigates the issues related to the spray-on polymer waterproofing finishing structure of bridge structures at low temperatures, with a focus on thermophysical modeling and macroroughness normalization. Through patent research and a comparative analysis of polymeric materials for waterproofing bridge structures, the chosen object of study is the domestically manufactured polymeric material (three-layer structure) called «Hydroflex-1», along with its close analogues that exhibit adhesion to concrete and metal, homogeneous strength properties, suitable operating temperature range, fewer structural layers, and the longest proven service life. The author presents the process and results of computational modeling regarding the thermophysical interaction between the distribution of a flat flame of the waterproofing hot mixture and a treated surface. The results of mathematical thermophysical modeling are validated through the visualization of the temperature field of the sprayed hot waterproofing layer using a thermal imager. The calculation error deviates by no more than 5°C from the results of full-scale measurements. The formation of point caving occurs on the slopes of areas with maximum irregularities, which is influenced by the temperature and flow rate of the sprayed mixture, cooling time, as well as the angle and height of the macroroughness ledge. The technology for the spray-on structure of a three-layer polymeric waterproofing finishing for steel-reinforced concrete and metal orthotropic slabs of bridge structures during repair at low temperatures below 10°C has been improved. This improvement aims to extend the construction season by considering thermophysical modeling and normalizing geometric and statistical parameters of macroroughness. Additionally, the results of ranking the dominant factors influencing the thermophysical interaction are taken into account.