Abstract Sustainable geopolymeric recycled aggregate concrete (RAC) by utilizing environmentally-friendly binder-geopolymer and constructional solid waste-recycled aggregate (RA) will facilitate the sustainability in concrete industry. This study investigated the compressive behavior of sustainable geopolymeric RAC confined by carbon fiber-reinforced polymer (CFRP) jackets. A total of 72 cylindrical fly ash/slag-based geopolymeric concrete specimens, including 48 CFRP-confined specimens and 24 unconfined specimens were fabricated and tested. The testing variables included: coarse aggregate type (i.e., natural aggregate and RA), thickness of CFRP jackets (i.e., 1, 2, and 3 layers) and (iii) slag content (i.e., 0, 10%, 20% and 30% of the total binder by mass). The results indicate that the CFRP confinement remarkably enhances the compressive strength and ultimate strain of geopolymeric concrete, and the enhancement is more pronounced with the increase of CFRP jacket thickness. Moreover, the RA replacement and the inclusion of slag have minor influences on the CFRP confinement performance for the compressive strength, but have obvious effects on the CFRP confinement performance for the ultimate axial strain. Based on the test results, empirical stress and strain models were proposed to predict the ultimate condition of the CFRP-confined geopolymeric concrete.

中文翻译：

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CFRP约束的可持续地质聚合物再生混凝土在轴压下的力学性能

摘要 可持续地聚合物再生骨料混凝土（RAC）通过利用环保粘合剂-地质聚合物和建筑固体废物再生骨料（RA）促进混凝土行业的可持续发展。本研究调查了由碳纤维增强聚合物 (CFRP) 护套限制的可持续地质聚合物 RAC 的压缩行为。共制作并测试了 72 个圆柱形粉煤灰/矿渣基地质聚合物混凝土试件，包括 48 个 CFRP 约束试件和 24 个非约束试件。测试变量包括：粗骨料类型（即天然骨料和 RA）、CFRP 护套的厚度（即 1、2 和 3 层）和 (iii) 炉渣含量（即 0、10%、20% 和 30占总粘合剂的质量百分比）。结果表明，CFRP约束显着提高了地聚合物混凝土的抗压强度和极限应变，并且随着CFRP护套厚度的增加，这种增强作用更加明显。此外，RA置换和夹渣对CFRP的抗压强度约束性能影响较小，但对CFRP极限轴向应变约束性能有明显影响。基于试验结果，提出了经验应力和应变模型来预测CFRP约束地聚合物混凝土的极限状态。RA置换和夹渣对CFRP的抗压强度约束性能影响较小，但对CFRP极限轴向应变约束性能有明显影响。基于试验结果，提出了经验应力和应变模型来预测CFRP约束地聚合物混凝土的极限状态。RA置换和夹渣对CFRP的抗压强度约束性能影响较小，但对CFRP极限轴向应变约束性能有明显影响。基于试验结果，提出了经验应力和应变模型来预测CFRP约束地聚合物混凝土的极限状态。