This paper presents the results of an investigation into the use of newly developed thermoplastic-based glass fiber-reinforced polymer (GFRP) bars as reinforcement in concrete structures. GFRP bars made with thermoplastic resins have an advantage over thermosetting-based ones in that they can be shaped after initial production of a straight profile, similar to conventional steel bars. In addition, thermoplastics are tougher, have greater impact resistance, and are more deformable than thermosets. This study assessed the physical and mechanical characteristics of new GFRP bars made with thermoplastic resins and compared them to thermoset-based GFRP bars. The long-term performance of these bars under alkaline exposure simulating a concrete environment was assessed. Moreover, the thermoplastic-based GFRP bars were tested under elevated temperatures of 40 °C and 70 °C. Subsequently, the bar properties were assessed and compared to the values obtained from unconditioned reference specimens. Furthermore, six #3 (10 mm) thermoplastic-based GFRP bars were tested for over 417 d (10,000 h) under different sustained load levels of 20% and 40% of the ultimate tensile strength (UTS) to address their creep evolution and were then compared to that obtained from thermoset-based GFRP bars under the same conditions. The test results reveal that the new thermoplastic-based GFRP bars had good mechanical behavior and could be placed in the same category as high-grade GFRP bars (CSA S807 2019). The GFRP bars showed high long-term durability performance with tensile strength and modulus retentions of 87% and 100%, respectively. The creep strain in the #3 (10 mm) thermoplastic-based GFRP bars under high stress of 40% of UTS was approximately 8% of the initial value after 10,000 h of sustained tensile loading.

本文介绍了使用新开发的热塑性基玻璃纤维增​​强聚合物（GFRP）钢筋作为混凝土结构增强材料的研究结果。用热塑性树脂制成的GFRP棒材比基于热固性的GFRP棒材具有优势，因为它们可以在最初生产出直线型材后成型，类似于传统的钢棒材。此外，热塑性塑料比热固性塑料更坚韧，具有更高的抗冲击性和更易变形。这项研究评估了用热塑性树脂制成的新型GFRP棒的物理和机械特性，并将其与基于热固性的GFRP棒进行了比较。评估了这些钢筋在碱性环境下模拟混凝土环境的长期性能。此外，在40°C和70°C的高温下测试了基于热塑性塑料的GFRP条。随后，评估棒的性能，并将其与从无条件参考样品中获得的值进行比较。此外，在20％和40％的极限抗拉强度（UTS）的不同持续载荷水平下，对六根3号（10 mm）热塑性塑料GF3棒进行了417 d（10,000 h）的测试，以应对其蠕变演变，然后与在相同条件下从热固性GFRP棒中获得的棒材进行比较。测试结果表明，新的基于热塑性塑料的GFRP钢筋具有良好的机械性能，可以与高档GFRP钢筋归为同一类别（CSA S807 2019）。GFRP钢筋具有很高的长期耐久性能，拉伸强度和模量保持率分别为87％和100％。