Resistance to temperature and humidity changes of construction plywood and thermal-insulation boards

Plywood and thermal-insulation boards with phenol-formaldehyde binder (PF), like other composites for construction purposes, must have long-term strength with changing temperature and humidity. The insufficient degree of curing of the phenol-formaldehyde binder reduces the hydrolytic stability of th...

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Autores principales: Fedotov Alexander, Vahnina Tatiana, Susoeva Irina
Formato: article
Lenguaje:EN
Publicado: Peter the Great St. Petersburg Polytechnic University 2021
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Acceso en línea:https://doaj.org/article/d03fbdf25d314cf9a77f1a666d2c6e1a
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spelling oai:doaj.org-article:d03fbdf25d314cf9a77f1a666d2c6e1a2021-11-12T15:54:04ZResistance to temperature and humidity changes of construction plywood and thermal-insulation boards2712-817210.34910/MCE.105.6https://doaj.org/article/d03fbdf25d314cf9a77f1a666d2c6e1a2021-09-01T00:00:00Zhttp://engstroy.spbstu.ru/article/2021.105.06/https://doaj.org/toc/2712-8172Plywood and thermal-insulation boards with phenol-formaldehyde binder (PF), like other composites for construction purposes, must have long-term strength with changing temperature and humidity. The insufficient degree of curing of the phenol-formaldehyde binder reduces the hydrolytic stability of the material. The aim of the study is to increase the long-term strength of materials when exposed to changes in temperature and humidity by improving the structure formation of composites with the introduction of modifying additives in the binder. In the work, the method of cyclic testing of materials “soaking – freezing – thawing – drying” was used. After each cycle, the strength of the samples was determined. Nine modifying additives to the phenol-formaldehyde binder were used – hydrogen peroxide, metal salts, sulfosalicylic acid, dimethylglyoxime. The proportion of additives varied from 0.5 to 1.5 %. Graphic dependences of changes in the strength of PF plywood and thermal-insulation boards from plant waste after cyclic tests are given. Materials on a modified binder have long-term resistance to variable temperature and humidity effects. Plywood on a phenol-formaldehyde binder with the addition of 0.5 % sulfosalicylic acid has, after 15 test cycles, a 2.8 times higher residual strength compared to plywood on an unmodified binder. Thermal-insulation composites from plant waste on a modified binder after cyclic tests have a strength of 9 % higher than plates on an unmodified binder.Fedotov AlexanderVahnina TatianaSusoeva IrinaPeter the Great St. Petersburg Polytechnic Universityarticlewood compositesphenol-formaldehyde bindermodificationstructuretemperaturehumiditystrengthEngineering (General). Civil engineering (General)TA1-2040ENMagazine of Civil Engineering, Vol None, Iss 05 (2021)
institution DOAJ
collection DOAJ
language EN
topic wood composites
phenol-formaldehyde binder
modification
structure
temperature
humidity
strength
Engineering (General). Civil engineering (General)
TA1-2040
spellingShingle wood composites
phenol-formaldehyde binder
modification
structure
temperature
humidity
strength
Engineering (General). Civil engineering (General)
TA1-2040
Fedotov Alexander
Vahnina Tatiana
Susoeva Irina
Resistance to temperature and humidity changes of construction plywood and thermal-insulation boards
description Plywood and thermal-insulation boards with phenol-formaldehyde binder (PF), like other composites for construction purposes, must have long-term strength with changing temperature and humidity. The insufficient degree of curing of the phenol-formaldehyde binder reduces the hydrolytic stability of the material. The aim of the study is to increase the long-term strength of materials when exposed to changes in temperature and humidity by improving the structure formation of composites with the introduction of modifying additives in the binder. In the work, the method of cyclic testing of materials “soaking – freezing – thawing – drying” was used. After each cycle, the strength of the samples was determined. Nine modifying additives to the phenol-formaldehyde binder were used – hydrogen peroxide, metal salts, sulfosalicylic acid, dimethylglyoxime. The proportion of additives varied from 0.5 to 1.5 %. Graphic dependences of changes in the strength of PF plywood and thermal-insulation boards from plant waste after cyclic tests are given. Materials on a modified binder have long-term resistance to variable temperature and humidity effects. Plywood on a phenol-formaldehyde binder with the addition of 0.5 % sulfosalicylic acid has, after 15 test cycles, a 2.8 times higher residual strength compared to plywood on an unmodified binder. Thermal-insulation composites from plant waste on a modified binder after cyclic tests have a strength of 9 % higher than plates on an unmodified binder.
format article
author Fedotov Alexander
Vahnina Tatiana
Susoeva Irina
author_facet Fedotov Alexander
Vahnina Tatiana
Susoeva Irina
author_sort Fedotov Alexander
title Resistance to temperature and humidity changes of construction plywood and thermal-insulation boards
title_short Resistance to temperature and humidity changes of construction plywood and thermal-insulation boards
title_full Resistance to temperature and humidity changes of construction plywood and thermal-insulation boards
title_fullStr Resistance to temperature and humidity changes of construction plywood and thermal-insulation boards
title_full_unstemmed Resistance to temperature and humidity changes of construction plywood and thermal-insulation boards
title_sort resistance to temperature and humidity changes of construction plywood and thermal-insulation boards
publisher Peter the Great St. Petersburg Polytechnic University
publishDate 2021
url https://doaj.org/article/d03fbdf25d314cf9a77f1a666d2c6e1a
work_keys_str_mv AT fedotovalexander resistancetotemperatureandhumiditychangesofconstructionplywoodandthermalinsulationboards
AT vahninatatiana resistancetotemperatureandhumiditychangesofconstructionplywoodandthermalinsulationboards
AT susoevairina resistancetotemperatureandhumiditychangesofconstructionplywoodandthermalinsulationboards
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