33407 2304-6295 2 87 2020 1-50

RAR RUS 7-12 Peter the Great St. Petersburg Pollytechnic University Shakhova Mariia Anatolevna vatin@mail.ru 0000-0003-4599-8938 Composite Technology and Tooling Ltd. Vasyutkin Evgeny Sergeevich evasyutkin@yandex.ru

Balashiha, Moscow Region, Russian Federation

Glass-reinforced plastic roof for mounted elevator shafts In this paper, the applicability of glass-reinforced plastic in the manufacture of small roofs, specifically roofs for mounted elevator shafts is considered. Advantages and disadvantages of polymeric composite materials are determined by comparing their composite modules with traditional roofing materials. The results obtained during the comparative analysis show that glass-reinforced plastic has a low weight, sufficient strength, high resistance to atmospheric action, conducts heat poorly, is corrosion-resistant and fire-resistant. All these properties provide structures with maintenance-free service life of more than 50 years. The results rationalize the feasibility of using glass-reinforced plastic in the manufacture of small roofs and prove necessity for its innovation in the field of construction and housing and utilities infrastructure 10.18720/CUBS.87.1 69 polymeric composite materials roofs roofing materials glass-reinforced plastic glass fibers glass-fibre mat polyester product forming https://unistroy.spbstu.ru/article/2020.87.1/ 871.pdf

RAR RUS 12-22 6506150284 0000-0003-1139-3164 Moscow State University of Civil Engineering Sainov Mikhail Petrovich mp_sainov@mail.ru

Moscow, Russian Federation

Formation and peculiarities of stress-strain state of rockfill dam concrete face Numerical modeling was used for study of stress-strain state (SSS) of 100 m high rockfill dam seepage control concrete face for a number of alternatives of rockfill deformation and arrangement of an under-face zone. Values of rockfill linear deformation modulus varied from 60 to 480 МPа, and of Poisson’s number they were from 0 to 0.3. The alternatives were considered where the face rested directly on the under-face zone of crushed stone or on concrete bedding. In the last case consideration was made of decrease of shear characteristics in the contact between the face and concrete bedding by arrangement of a bitumen mastic layer. As a result of study there was investigated the role of tangent stresses on the contact of the face with the under-face zone in formation of the concrete face SSS. It was revealed that tangent stresses cause longitudinal forces in the face as well as longitudinal bending. It was shown that presence of bituminous lubrication layer permitted decrease by one third of tangent stresses at the contact and tensile stresses in the face. 10.18720/CUBS.87.2 69 concrete faced rockfill dam (CFRD) stress-strain state friction longitudinal forces bending moment longitudinal bending tension strength https://unistroy.spbstu.ru/article/2020.87.2/ 872.pdf

RAR RUS 23-40 0000-0001-5354-7657 Peter the Great Saint Petersburg Polytechnic University, Saint Petersburg, Russian Federation Rusakov Michael Nikolaevich mishut8rusakov@mail.ru

Saint Petersburg, Russian Federation

0000-0001-9325-2335 Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russian Federation Ismailov Aleksey ismailov-aleksei@mail.ru

St. Petersburg, Russian Federation

Styrene-butadiene-styrene polymers for road construction in the Russian Federation The object of the research are styrene-butadiene-styrene polymers. This article discusses the main properties of polymer-bitumen binders with the addition of German, South Korean, Swedish and Russian SBS polymers. The properties of these materials are compared. The possibility of import substitution of foreign modifiers by Russian ones for the Russian Federation is determined 10.18720/CUBS.87.3 69 Styrene-butadiene-styrene polymer-bitumen binder road oil bitumen modifier import substitution building materials roads https://unistroy.spbstu.ru/article/2020.87.3/ 8703(1).pdf