A comprehensive study on enhancing the fire resistance of Glass Fiber-Reinforced Polymer (GFRP) reinforced concrete columns and slabs

本项目的目的是提供一个全面的调查玻璃纤维增强聚合物（GFRP）钢筋混凝土构件在火灾中，即柱和板。这项研究将有三个主要的实验阶段：（1）标准拔出测试的MST酒吧在环境室;（2）中期和全尺寸的标准火灾测试将进行GFRP钢筋混凝土板与膨胀涂料在板的端部;和（3）全尺寸柱完全GFRP钢筋将在标准火灾下进行测试，在北美的第一次。迄今为止，FRP钢筋在高温下的粘结强度的损失和退化已被确定为FRP-钢筋混凝土（RC）元件相比，钢RC元件的防火性能较差的主要原因。试验结果表明，当FRP筋两端温度低于其玻璃化转变温度时，FRP筋的粘结破坏将得到明显改善。为了实现这一目标，建议保护FRP RC构件的锚固区不受直接火灾的影响，以延迟温度传播到锚固区的嵌入式FRP钢筋中。最近，具有非常薄的层的膨胀型涂料的应用已经显示出具有延迟温度传播到混凝土中的有希望的结果。薄膜膨胀型涂料可以极大地保护结构元件免受火灾中可能发生的严重温度的影响。膨胀型涂料是传统被动防火层的一种易于应用且具有成本效益的替代品。上述试验将用于检查GFRP钢筋混凝土柱的性能，以及GFRP箍筋和GFRP纵向钢筋在火灾期间的行为。通过此次合作，MST Rebar将对GFRP RC柱的耐火性充满信心，并提供切实可行的措施来提高GFRP RC板的耐火性。加拿大规范，如CSA-S806，是专门为推广GFRP RC结构而制定的。这项研究的结果将为加拿大制定CSA-S806规定提供知识。

This project aims to provide a holistic investigation of Glass fibre reinforced polymer (GFRP) reinforced concrete members in fire, namely columns and slabs. This research will have three main experimental phases: (1) standard pullout tests on MST bars in an environmental chamber; (2) intermediate and full-scale standard fire tests will be conducted on GFRP-reinforced concrete slabs with intumescent coating at the ends of the slabs; and (3) a full-scale column entirely reinforced with GFRP bars will be tested under standard fire for the first time in North America. To date, the loss and degradation of bond strength of FRP reinforcing bars at high temperatures has been identified as the main cause of the inferior fire performance of FRP-reinforced concrete (RC) elements compared to steel RC ones. The test results have revealed that if temperatures at both ends of an FRP bar remain below its glass transition temperature the bond failure of the FRP RC member will significantly improve. To achieve this, the anchorage zones in FRP RC members are recommended to be protected from direct fire exposures to delay the temperature propagation into the embedded FRP reinforcing bars at the anchorage zones. Recently, the application of intumescent coatings with very thin layers has shown promising results with delayed temperature propagation into the concrete. The thin-film intumescent coatings greatly protect structural elements against severe temperatures that can occur in fires. The intumescent coatings are an easy-to-apply and cost-effective alternative to conventional passive fire protection layers. The previously mentioned tests will be used to examine the performance of GFRP reinforced concrete columns, as well as the behaviour of GFRP stirrups and GFRP longitudinal bars during a fire. Through this partnership, MST Rebar will be confident in the fire resistance of GFRP RC columns and offer practical measures to enhance the fire resistance of GFRP RC slabs. Canadian codes, such as CSA-S806, are specifically developed to promote GFRP RC structures. The outcome of this research will provide knowledge in developing provisions for CSA-S806 in Canada.