Assessment of Extremely Cold Subarctic Climate Environment Destruction of the Basalt Fiber Reinforced Epoxy (BFRE) Rebar Using Its Moisture Uptake Kinetics

Polymers

Mikhail P. Lebedev¹  Alina A. Vasilieva¹  Aisen A. Kychkin¹  Anna A. Gavrilieva²  Anastasia V. Sivtseva²  Anatoly K. Kychkin² 

[1] Federal Research Center, The Yakut Scientific Centre of the Siberian Branch of the Russian Academy of Sciences, 2 Petrovskogo Str., Yakutsk 677000, Russia;V.P. Larionov Institute of Physical and Technical Problems of the North Siberian Branch Russian Academy of Sciences, 1 Oktyabrskaya Street, Yakutsk 677980, Russia;

关键词: destruction;    cold climate;    epoxy binder;    basalt fiber;    BFRP;    rebar;   

DOI  :  10.3390/polym13244325

来源: DOAJ

【 摘 要 】

A quite simple method is proposed for the assessment of extremely cold subarctic climate environment destruction of the basalt fiber reinforced epoxy (BFRE) rebar. The method involves the comparison of experimentally obtained long-term moisture uptake kinetic curves of unexposed and exposed BFRP rebars. A moisture uptake test was carried out at the temperature of 60 °C and relative humidity of 98 ± 2% for 306 days. The plasticization can be neglected because of low-level moisture saturation (<0.41% wt.); the swelling and structural relaxation of the polymer network can be neglected due to the high fiber content of BFRP rebar; moisture diffusion into the basalt fibers can be neglected since it is a much lesser amount than in the epoxy binder. These assumptions made it possible to build a three-stage diffusion model. It is observed that an increase in the density of defects with an increase in the diameter of the BFRP rebar is the result of the technology of manufacturing a periodic profile. The diffusion coefficient of the BFRP rebar with a 6, 10, or 18 mm diameter increased at an average of 82.7%, 56.7%, and 30%, respectively, after exposure to the climate of Yakutsk during 28 months, whereas it was known that the strength indicators had been increased.

【 授权许可】

Unknown