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An experimental study of the insulation performance of ballastless track slabs reinforced by new fiber composite bars

机译：新型纤维复合筋加固无ast轨道平板保温性能的试验研究。

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摘要

Due to inductive impedance caused by steel meshes in traditional reinforced ballastless track slabs, the electric properties, primarily rail resistance and inductance, of the track circuit are affected by electromagnetic induction between the slabs and the electric current in the rail. This problem results in poor transmission performance through the track circuit. Insulating heat-shrinkable sleeves between the steel meshes have been used to improve the insulation capability of steel meshes in slabs; however, they reduce the bonding performance between the steel bars and concrete. Because of the highly insulating properties of fiber reinforced polymer (FRP) and steel-fiber reinforced polymer composite bar (SFCB), these composite materials have shown promise to overcome the insulation problem. In the study reported in this paper, single and double layer meshes and ballastless track slabs were manufactured and tested for the first time. In the research reported herein, basalt fiber reinforced polymer (BFRP) and SFCB were used in meshes and slabs, respectively. The electric properties of the rail affected by these meshes and slabs were investigated and compared with steel meshes and ordinary reinforced ballastless track slabs (RC). As the test results demonstrated, the signal frequency and distance between the slabs or meshes and the rail had a significant impact on the electric properties of the rail. Furthermore, the variation in rail resistance induced by the slabs or meshes increased drastically, while the change in rail inductance increment varied slowly. BFRP and SFCB used as transverse reinforcement of slabs or meshes reduced the variation in the electric properties of the rail. BFRP reinforced ballastless track slabs had the highest insulating performance, while those with SFCB demonstrated the second highest performance. (C) 2015 Published by Elsevier Ltd.
机译：由于传统增强型无ball轨道板中钢网引起的感应阻抗，轨道电路的电气特性（主要是轨道电阻和电感）受板之间电磁感应和轨道电流的影响。该问题导致通过跟踪电路的较差的传输性能。钢网之间的绝缘热缩套管已被用于提高平板中钢网的绝缘能力。但是，它们降低了钢筋和混凝土之间的粘结性能。由于纤维增强聚合物（FRP）和钢纤维增强聚合物复合棒（SFCB）的高度绝缘性，这些复合材料已显示出有望克服绝缘问题的希望。在本文报道的研究中，单层和双层网以及无ball轨道板是首次制造和测试的。在本文报道的研究中，玄武岩纤维增强聚合物（BFRP）和SFCB分别用于网格和平板中。研究了受这些网格和平板影响的钢轨的电气性能，并将其与钢网格和普通增强型无track轨道平板（RC）进行了比较。如测试结果所示，平板或网格与轨道之间的信号频率和距离对轨道的电性能产生重大影响。此外，由板或网引起的轨道电阻的变化急剧增加，而轨道电感增量的变化则缓慢变化。 BFRP和SFCB用作板或网的横向加强件，减少了钢轨电性能的变化。 BFRP增强的无ball轨道板具有最高的绝缘性能，而具有SFCB的板则表现出第二高的绝缘性能。 （C）2015年由Elsevier Ltd.出版

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