Geopolymer concrete (GPC) with Glass fibre-reinforced polymer (GFRP) bars can provide a better construction system with high sustainability, high durability, and adequate strength. Few studies deal with the combination of these materials. The present investigation obtains the flexural capacity and behaviour of GPC and ordinary Portland concrete beams reinforced with GFRP bars (GFRP-RGPC and GFRP-ROPC, respectively). Twelve beams consisting of nine GFRP-RGPC and three GFRP-ROPC beams were cast and tested by using the four-point bending test over an active span of 2000 mm. Rebar ratio, compressive strength, and concrete types were taken as the variables. Initial cracking load, ultimate load capacity, load–deflection behaviour, Load–strain curves, crack width, the number of cracks and failure modes, were studied. Experimental results of beams were compared with the proposed equations provided by ACI 440.1R-15, CSA S806-12, and parabolic stress block method. The Results showed the decrease of deflection and increase of first cracking load by increasing the compressive strength. A slight increase in the deflection of GFRP-RGPC beams and approximately the same value of ultimate load were observed. GFRP-RGPC beams also recorded a higher value of crack width compared with GFRP-ROPC beams. The parabolic stress block method predicted the flexural capacity of the beams close to the experimental results rather than ACI 440.1R-15 and CSA S806-12.

中文翻译：

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用玻璃纤维增​​强聚合物棒加固的地质聚合物混凝土梁的抗弯能力和性能

具有玻璃纤维增​​强聚合物 (GFRP) 钢筋的地质聚合物混凝土 (GPC) 可以提供具有高可持续性、高耐久性和足够强度的更好的施工系统。很少有研究涉及这些材料的组合。本研究获得了 GPC 和用 GFRP 钢筋（分别为 GFRP-RGPC 和 GFRP-ROPC）加固的普通波特兰混凝土梁的抗弯能力和性能。由 9 根 GFRP-RGPC 和 3 根 GFRP-ROPC 梁组成的 12 根梁通过使用四点弯曲试验在 2000 毫米的活动跨度上进行铸造和测试。钢筋比率、抗压强度和混凝土类型作为变量。研究了初始开裂载荷、极限载荷能力、载荷-挠度行为、载荷-应变曲线、裂纹宽度、裂纹数量和失效模式。梁的实验结果与 ACI 440.1R-15、CSA S806-12 和抛物线应力块法提供的建议方程进行了比较。结果表明，随着抗压强度的增加，挠度减小，一次开裂载荷增加。观察到 GFRP-RGPC 梁的挠度略有增加，极限载荷值大致相同。与 GFRP-ROPC 梁相比，GFRP-RGPC 梁还记录了更高的裂纹宽度值。抛物线应力块法预测的梁的抗弯能力接近实验结果，而不是 ACI 440.1R-15 和 CSA S806-12。结果表明，随着抗压强度的增加，挠度减小，一次开裂载荷增加。观察到 GFRP-RGPC 梁的挠度略有增加，极限载荷值大致相同。与 GFRP-ROPC 梁相比，GFRP-RGPC 梁还记录了更高的裂纹宽度值。抛物线应力块法预测的梁的抗弯能力接近实验结果，而不是 ACI 440.1R-15 和 CSA S806-12。结果表明，随着抗压强度的增加，挠度减小，一次开裂载荷增加。观察到 GFRP-RGPC 梁的挠度略有增加，极限载荷值大致相同。与 GFRP-ROPC 梁相比，GFRP-RGPC 梁还记录了更高的裂纹宽度值。抛物线应力块法预测的梁的抗弯能力接近实验结果，而不是 ACI 440.1R-15 和 CSA S806-12。