The use of lightweight concrete can provide specific advantages that are favoring for mitigating seismic risk in building design. On the other hand, a significant reduction of carbon footprint could be possible through the use of geopolymer concrete. However, geopolymer concrete is mostly assessed through small specimens without reinforcement elements. This paper aims to couple the advantage of lightweight mixtures and ambient-cured geopolymerization in reinforced beams. To do this, engineering performance of reinforced lightweight geopolymer concrete was extensively investigated with different aspects. In mixtures, pumice and volcanic tuff aggregates were used with an appropriate gradation. Flexural strength, deflection capacities, initial stiffness, ductility, and energy dissipation capacity of reinforced geopolymer beams were investigated with the proposed configuration. Compressive strength and unit weight of the developed mixtures were also evaluated to meet design requirements for lightweight concrete. Results indicated that certain engineering properties (energy dissipation capacity and initial stiffness) of developed lightweight geopolymer concrete were considerably comparable with lightweight Portland cement-based concrete. Although compressive strength and unit weight of the developed geopolymer mixtures were satisfying, microstructural analysis indicated a weak bonding behavior between paste and lightweight aggregates.

中文翻译：

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常温养护加筋轻质地质聚合物混凝土梁的工程性能

轻质混凝土的使用可以提供有利于减轻建筑设计中的地震风险的特定优势。另一方面，通过使用地质聚合物混凝土可以显着减少碳足迹。然而，地质聚合物混凝土主要通过没有增强元件的小试样进行评估。本文旨在将轻质混合物的优势与增强梁中的常温固化地质聚合相结合。为此，从不同方面对加筋轻质地质聚合物混凝土的工程性能进行了广泛研究。在混合物中，浮石和火山凝灰岩骨料以适当的级配使用。抗弯强度、挠曲能力、初始刚度、延展性、用所提出的配置研究了加筋地质聚合物梁的能量耗散能力。还评估了开发的混合物的抗压强度和单位重量，以满足轻质混凝土的设计要求。结果表明，开发的轻质地质聚合物混凝土的某些工程特性（能量耗散能力和初始刚度）与轻质波特兰水泥基混凝土相当。尽管所开发的地质聚合物混合物的抗压强度和单位重量令人满意，但微观结构分析表明浆料和轻质骨料之间的粘合行为较弱。结果表明，开发的轻质地质聚合物混凝土的某些工程特性（能量耗散能力和初始刚度）与轻质波特兰水泥基混凝土相当。尽管所开发的地质聚合物混合物的抗压强度和单位重量令人满意，但微观结构分析表明浆料和轻质骨料之间的粘合行为较弱。结果表明，开发的轻质地质聚合物混凝土的某些工程特性（能量耗散能力和初始刚度）与轻质波特兰水泥基混凝土相当。尽管所开发的地质聚合物混合物的抗压强度和单位重量令人满意，但微观结构分析表明浆料和轻质骨料之间的粘合行为较弱。