Kychkin Anatoly K, Gavrilieva Anna A, Vasilieva Alina A, Kychkin Aisen A, Lebedev Mikhail P, Sivtseva Anastasia V
V.P. Larionov Institute of Physical and Technical Problems of the North Siberian Branch Russian Academy of Sciences, 1 Oktyabrskaya Street, Yakutsk 677980, Russia.
Federal Research Center, The Yakut Scientific Centre of the Siberian Branch of the Russian Academy of Sciences, 2 Petrovskogo Str., Yakutsk 677000, Russia.
Polymers (Basel). 2021 Dec 10;13(24):4325. doi: 10.3390/polym13244325.
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.
本文提出了一种评估玄武岩纤维增强环氧树脂（BFRE）钢筋在极寒亚北极气候环境中破坏情况的简单方法。该方法包括比较未暴露和暴露的BFRP钢筋实验获得的长期吸湿动力学曲线。在60℃温度和98±2%相对湿度下进行了306天的吸湿试验。由于低水平的水分饱和度（<0.41%重量），增塑作用可忽略不计；由于BFRP钢筋的纤维含量高，聚合物网络的溶胀和结构松弛可忽略不计；由于进入玄武岩纤维的水分量比环氧树脂粘结剂中的少得多，因此水分向玄武岩纤维中的扩散可忽略不计。这些假设使得建立一个三阶段扩散模型成为可能。观察到随着BFRP钢筋直径的增加，缺陷密度的增加是制造周期性型材技术的结果。直径为6、10或18mm的BFRP钢筋在雅库茨克气候条件下暴露28个月后，扩散系数分别平均增加了82.7%、56.7%和30%，而众所周知强度指标有所提高。
