PSI - Issue 30

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceDirect Structural Integrity Procedia 00 (2020) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000–000

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ScienceDirect

Procedia Structural Integrity 30 (2020) 186–192

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Moisture diffusion in basalt-plastic reinforcing bars was investigated during exposing samples in the North conditions for 28 months and in a desiccator above the distilled water surface for 306 days at a temperature of 60 °C. The highest moisture absorption of the initial samples and the exposed samples of BPR does not exceed 0.35%. The initial kinetics of moisture saturation of the initial and exposed samples is similar; the rate of relative mass change is at its maximum at the beginning and reaches a plateau after about 100 days. Due to formation and development of micro- and macrodamages, the kinetics of moisture saturation of exposed samples to an extremely cold climate has a variation. Internal stresses arise in basalt-plastic reinforcement and epoxy anhydride binder in cold climates, owing to the unequal thermal expansion of basalt fiber, and cause the formation of microcracks. The experimental kinetics was approximated by Fick's law under constant boundary conditions for 6 mm diameter reinforcement bars. A significant change in diffusivity from 16% to 56% and decrease in 20% of maximum moisture saturation for exposed BPR samples in comparison with the stored in warehouse confirms the initial stage of degradation mechanism of reinforcing bars, particularly, uneven destruction of the surface layer and post-curing of the epoxy binder. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Moisture diffusion in basalt-plastic reinforcing bars was investigated during exposing samples in the North conditions for 28 m nths and in a desiccator above the distilled water surfac for 306 days at a temperatur of 60 °C. T e highest moisture absorptio of the initial samples and the exposed samples of BPR does not exc ed 0.35%. The initial kinet cs of satu ati of the init al and expo ed sampl s is imil r; th rate of relative mass change is at its maximum at the beginning and reaches a pla eau af er about 100 day . Du to for ation and d velopment of micro- and m croda ges, the kin tics of moisture saturation of xposed s mples to an extremely cold clim te has a variation. Internal stresses arise in basalt-plastic rein orcement and ep xy anhydride binder in cold climates, owing to the unequal thermal expa sion of bas lt fiber, nd cause the formation of microcracks. The experim ntal kinetics wa approxima ed by Fick's law under constant oundary conditions for 6 mm diameter re nf rcement bars. A s gnificant change in diffusivity from 16% to 56% and decrease in 20% of maximum moisture saturation for exposed BPR samples in comp rison with the s ored in wareh use co firms the initial stage of degradati n m ch nism f reinforcing bars, particularly, uneven destruc ion of the surface layer and p st-curing of the epoxy binder. © 2020 The Autho s. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of EURASTRENCOLD - 2020 guest editors K ywords: rebar; climatic aging; atm sp eric testing; fickian diffusion; moist re absorption IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) The experimental evaluation of the diffusion coefficient and the moisture saturation of basalt fiber reinforced rebar with an anhydride curing agent after climate aging in a cold climate Vasilieva A.A. a,b *, Gavrilieva A.A. a , Sivtseva A.V. a , Kychkin A.K. a , Petrova N.N. c a Larionov Institute of the Physical-Technical Problems of the North SB RAS, Yakutsk b The Yakut Scientific Centre of the Siberian Branch of the Russian Academy of Sciences, Yakutsk 677980, Russia c M.K. Ammosov North-Eastern Federal University, Yakutsk 677000, Russia IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) The experimental evaluation of the diffusion coefficient and the moisture saturation of basalt fiber reinforced rebar with an anhydride curing agent after climate aging in a cold climate Vasilieva A.A. a,b *, Gavrilieva A.A. a , Sivtseva A.V. a , Kychkin A.K. a , Petrova N.N. c a Larionov Institute of the Physical-Technical Problems of the North SB RAS, Yakutsk b The Yakut Scientific Centre of the Siberian Branch of the Russian Academy f Sciences, Yakutsk 677980, Russia c M.K. Ammosov North-Eastern Federal University, Yakutsk 677000, Russia Abstract Abstract Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Keywords: rebar; climatic aging; atmospheric testing; fickian diffusion; moisture absorption

* Corresponding author. Tel.: +7-914-109-90-21. E-mail address: kiir@mail.ru * Corresponding author. Tel.: +7-914-109-90-21. E-mail ad ress: kiir@mail.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of the EURASTRENCOLD - 2020 guest editor 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der the responsibility of the EURASTRENCOLD - 2020 gu st editor

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors 10.1016/j.prostr.2020.12.029