graduate student
Russian Federation
employee
Russian Federation
employee
Russian Federation
employee
Russian Federation
UDC 691.175.664
CSCSTI 67.09
Russian Classification of Professions by Education 08.06.01
Russian Library and Bibliographic Classification 383
Russian Trade and Bibliographic Classification 541
Introduction. In modern construction, di- and polyisocyanate-based foams are widely used for sealing and providing thermal and sound insulation where translucent structures meet wall openings. Modern architectural solutions that involve increasing glazing areas lead to increased loads on installation joints due to temperature and wind effects. Therefore, assessing the deformation resistance of polymer sealing materials is essential. The aim of this study is to experimentally evaluate the adhesive and deformation properties of four brands of industrial mounting foams and to analyze their applicability taking into account the design features of mounting joints. Materials and Methods. This article presents the results of a comprehensive assessment of the adhesion and deformation properties of industrial polyurethane-based foams from various manufacturers, widely used in the Russian construction market. The studies were conducted in accordance with the requirements of GOST 30971-2012 and GOST R 59599-2021. The adhesion strength of mounting foams to typical bases (D500 aerated concrete and B25 concrete in combination with a PVC profile) and deformation resistance under cyclic loads with an amplitude of 8, 11 and 15% are considered. Results. It was found that all industrial grades of polyurethane foams exceed the minimum adhesion requirement (at least 0.05 MPa) in terms of adhesion properties. It was also discovered that industrial polyurethane foams do not meet Class A standards for deformation resistance. Based on calculations according to GOST 30971-2012, the influence of joint width on deformation levels, particularly in horizontal joints, is demonstrated. It is noted that failure of the polyurethane foams to meet Class A standards does not invalidate the tested polyurethane foams. Calculating the deformation capacity of the assembly joint showed that the actual deformation amplitude depends heavily on the joint width. For example, for a horizontal joint 20 mm wide, the deformation is 9.72%, while for a 60 mm wide joint, it is only 3.24%. This indicates that even Class B polyurethane foams can be successfully used in structures with properly designed joint geometry. Conclusions. The key engineering solution when using Class B foams is to increase the width of the mounting joint, especially for horizontal joints, where deformation is almost twice as great as in vertical joints. The obtained experimental data allow for the informed selection of mounting foams for sealing joints depending on the design and climatic operating conditions. The development of highly elastic polyurethane foams for use in building structures subject to high deformations is a pressing issue in modern construction materials science due to the trend toward increasing the dimensions of translucent structures.
mounting foam, polyurethane foam, adhesion, deformation resistance, adhesive strength
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