This study investigates the use of glass fiber reinforced polymer (GFRP) waste powder as a partial replacement for cementitious materials in the synthesis of geopolymer concretes (GPCs), focusing on their durability under freeze-thaw (F-T) conditions. Two types of binary GPCs were synthesized: GFRP powder/ground granulated blast furnace slag (GGBS)-based GPC and GFRP powder/fly ash (FA)-based GPC, with a GFRP powder weight content of 30 %. Single GFRP powder-based, GGBS-based and FA-based GPCs were prepared as reference materials. The F-T resistance was evaluated through mass loss and residual compressive strength (RCS), as well as examining the microstructure using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). Results demonstrated that the mass loss of all GPC samples remained below the critical value of 5 % after 300 cycles. The incorporation of 30 wt% GFRP powder into GGBS-based GPC resulted in improved resistance to F-T damage, increasing the number of cycles endured from 200 to 300. Similarly, adding 30 wt% GFRP powder to FA-based GPC demonstrated enhanced resistance to F-T deterioration, with the number of cycles increasing from 150 to 175. The pore distributions of GFRP powder/FA-based GPC remained relatively unchanged before 200 F-T cycles, indicating it effective resistance against F-T conditions. GFRP powder/GGBS-based GPC exhibited a more uniform and denser microstructure with a reduced presence of pores, even after enduring 300 F-T cycles, making it better equipped to withstand F-T cycles. Furthermore, prediction models were developed to estimate RCS and damage evolution due to F-T conditions, producing accurate results compared to test data. This study presents an effective method for the utilization of GFRP waste as a building material in cold environments.

中文翻译：

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掺GFRP废粉地聚物混凝土抗冻融性能评价


本研究研究了在地质聚合物混凝土（GPC）合成中使用玻璃纤维增​​强聚合物（GFRP）废粉作为水泥材料的部分替代品，重点关注其在冻融（F-T）条件下的耐久性。合成了两种类型的二元 GPC：基于 GFRP 粉末/粒状高炉矿渣 (GGBS) 的 GPC 和基于 GFRP 粉末/粉煤灰 (FA) 的 GPC，其中 GFRP 粉末重量含量为 30%。制备了基于 GFRP 粉末、基于 GGBS 和基于 FA 的单一 GPC 作为参考材料。通过质量损失和残余压缩强度 (RCS) 评估 F-T 抗性，并使用扫描电子显微镜 (SEM) 和压汞孔隙率测定法 (MIP) 检查微观结构。结果表明，300 次循环后，所有 GPC 样品的质量损失仍低于 5% 的临界值。将 30 wt% GFRP 粉末加入到基于 GGBS 的 GPC 中，可提高对 F-T 损伤的抵抗力，将经受的循环次数从 200 次增加到 300 次。同样，将 30 wt% GFRP 粉末添加到基于 FA 的 GPC 中，证明了对 F-T 损伤的抵抗力增强随着循环次数从 150 次增加到 175 次，GFRP 粉末/FA 基 GPC 的孔分布在 200 个 F-T 循环之前保持相对不变，表明其对 F-T 条件具有有效的抵抗力。即使在经历 300 个 F-T 循环后，基于 GFRP 粉末/GGBS 的 GPC 仍表现出更均匀、更致密的微观结构，并且孔隙减少，这使其能够更好地承受 F-T 循环。此外，还开发了预测模型来估计 RCS 和 F-T 条件引起的损伤演变，与测试数据相比，产生准确的结果。 这项研究提出了一种在寒冷环境下利用 GFRP 废料作为建筑材料的有效方法。