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Influence of moderately warm and extremely cold climate on properties of basalt plastic armature
Rods of basalt plastic armature (BPA) of a periodic profile with diameters of 6, 8, 10, 16 and 20 mm on the basis of an epoxy matrix were exposed for 30 months on open stands in a moderately warm marine climate of Gelendzhik and 28 months on similar stands in an extremely cold climate of Yakutsk. Fo...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6305695/ https://www.ncbi.nlm.nih.gov/pubmed/30603695 http://dx.doi.org/10.1016/j.heliyon.2018.e01060 |
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author | Startsev, V.O. Lebedev, M.P. Kychkin, A.K. |
author_facet | Startsev, V.O. Lebedev, M.P. Kychkin, A.K. |
author_sort | Startsev, V.O. |
collection | PubMed |
description | Rods of basalt plastic armature (BPA) of a periodic profile with diameters of 6, 8, 10, 16 and 20 mm on the basis of an epoxy matrix were exposed for 30 months on open stands in a moderately warm marine climate of Gelendzhik and 28 months on similar stands in an extremely cold climate of Yakutsk. For initial and exposed BPA samples, changes of mechanical parameters were determined. After the exposure in Yakutsk, an increase of ultimate compression strength by 4–12% is found, depending on the diameter of rods. After the exposure in Gelendzhik, this indicator decreases by 10–17%. Using methods of thermomechanical analysis and dynamic mechanical analysis, linear thermal expansion coefficient and glass transition temperature of epoxy matrix were measured. In an initial state, a transition from a glassy state to a highly elastic one is discovered: an [Formula: see text]-transition at 118 °C and an [Formula: see text]-transition at 149 °C. After climatic action, there were detected a shift of [Formula: see text]-transition to low temperatures and a shift of [Formula: see text]-transition to higher temperatures. Reasons for the change of temperatures of transitions are weakening of a molecular layer and post-curing of the epoxy matrix in a surface layer. These effects are accompanied by an increase of the linear thermal expansion coefficient, moisture diffusion coefficient and maximum moisture saturation after the climatic action on BPA. Fractographic studies discovered presence of pores in a structure of BPA with sizes up to 10–20 μm, a quantity and size of which increase by 20–40% after the climatic action. In general, the studied BPA has high climatic stability and can be used for a long time under the extreme climatic conditions. |
format | Online Article Text |
id | pubmed-6305695 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-63056952019-01-02 Influence of moderately warm and extremely cold climate on properties of basalt plastic armature Startsev, V.O. Lebedev, M.P. Kychkin, A.K. Heliyon Article Rods of basalt plastic armature (BPA) of a periodic profile with diameters of 6, 8, 10, 16 and 20 mm on the basis of an epoxy matrix were exposed for 30 months on open stands in a moderately warm marine climate of Gelendzhik and 28 months on similar stands in an extremely cold climate of Yakutsk. For initial and exposed BPA samples, changes of mechanical parameters were determined. After the exposure in Yakutsk, an increase of ultimate compression strength by 4–12% is found, depending on the diameter of rods. After the exposure in Gelendzhik, this indicator decreases by 10–17%. Using methods of thermomechanical analysis and dynamic mechanical analysis, linear thermal expansion coefficient and glass transition temperature of epoxy matrix were measured. In an initial state, a transition from a glassy state to a highly elastic one is discovered: an [Formula: see text]-transition at 118 °C and an [Formula: see text]-transition at 149 °C. After climatic action, there were detected a shift of [Formula: see text]-transition to low temperatures and a shift of [Formula: see text]-transition to higher temperatures. Reasons for the change of temperatures of transitions are weakening of a molecular layer and post-curing of the epoxy matrix in a surface layer. These effects are accompanied by an increase of the linear thermal expansion coefficient, moisture diffusion coefficient and maximum moisture saturation after the climatic action on BPA. Fractographic studies discovered presence of pores in a structure of BPA with sizes up to 10–20 μm, a quantity and size of which increase by 20–40% after the climatic action. In general, the studied BPA has high climatic stability and can be used for a long time under the extreme climatic conditions. Elsevier 2018-12-21 /pmc/articles/PMC6305695/ /pubmed/30603695 http://dx.doi.org/10.1016/j.heliyon.2018.e01060 Text en © 2018 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Startsev, V.O. Lebedev, M.P. Kychkin, A.K. Influence of moderately warm and extremely cold climate on properties of basalt plastic armature |
title | Influence of moderately warm and extremely cold climate on properties of basalt plastic armature |
title_full | Influence of moderately warm and extremely cold climate on properties of basalt plastic armature |
title_fullStr | Influence of moderately warm and extremely cold climate on properties of basalt plastic armature |
title_full_unstemmed | Influence of moderately warm and extremely cold climate on properties of basalt plastic armature |
title_short | Influence of moderately warm and extremely cold climate on properties of basalt plastic armature |
title_sort | influence of moderately warm and extremely cold climate on properties of basalt plastic armature |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6305695/ https://www.ncbi.nlm.nih.gov/pubmed/30603695 http://dx.doi.org/10.1016/j.heliyon.2018.e01060 |
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