Strength and deformation characteristics of modern PU-foams economy class

The work was done the analysis of the strength and deformation characteristics of the modern PU-foams, and the rationale for their application in erection to joints of window assemblies adjoined to wall openings. The study of PU-foam econocom segment was made. The analysis of the system “window unit-erection joint” under the influence of the existing complex of loads and actions was performed. The assessment of linear temperature deformations of PVC, aluminum and wood windows was made. Laboratory tests of five types of PU-foams were made. The following PU-foam characteristics were determined: density, tensile strength and elongation at break. It was found that at the average PU- foams density less than 13,46 kg/m3, their average tensile strength and elongation at break were 0,058 MPa and 1,37%, respectively. The obtained indicators were significantly lower than the standard values. It was determined that modern PU-foams economy segment, presented on the russian market, have a limited scope and can only be used for the windows not affected by significant changes in operating temperatures (located indoors, protected from direct sunlight), as well as any wooden windows. For installation of large-format color PVC windows it is necessary to use PU-foams with the relative elongation at break not less than 10%.

A.P. KONSTANTINOV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
V.S. SEMENOV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)

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