This paper presents an experimental and analytical study on the age-dependent mechanical properties of geopolymer concrete. The effect of total aggregate content and the ratio of sand-to-total aggregate content on the engineering properties of geopolymer concrete has been investigated. Geopolymer concrete cubes, prisms, and cylinders were prepared and tested for evaluation of the engineering properties of geopolymer concrete at the times of 3, 7, 28, 56, 90, and 180 days. The experimentally obtained results showed that the combination of 70% of the total aggregate by volume and 0.35 by weight the ratio of sand-to-total aggregate had been given the maximum strength of fly ash-based geopolymer concrete. The assessment of available models for the calculation of age-dependent modulus of elasticity and compressive strength with experimental results has been studied as well. An analytical model has been suggested for predicting the modulus of elasticity and compressive strength of geopolymer concrete at any age. The proposed models showed a good match with the experimental results. The present experimental and analytical study will be helpful in the production and design of geopolymer concrete structures.

中文翻译：

---

粉煤灰基聚合物混凝土的抗压强度和弹性模量

本文介绍了地质聚合物混凝土随年龄变化的力学性能的实验和分析研究。研究了总骨料含量和砂与总骨料的比例对地聚合物混凝土工程性能的影响。制备并测试地质聚合物混凝土立方体、棱柱和圆柱体，以评估地质聚合物混凝土在 3、7、28、56、90 和 180 天的工程性能。实验得到的结果表明，70%的总体积骨料和0.35重量比的砂与总骨料的组合已经给出了粉煤灰基地质聚合物混凝土的最大强度。还研究了用于计算与年龄相关的弹性模量和抗压强度的可用模型的评估以及实验结果。已经提出了一种分析模型来预测任何年龄的地质聚合物混凝土的弹性模量和抗压强度。所提出的模型与实验结果表现出良好的匹配。目前的实验和分析研究将有助于地质聚合物混凝土结构的生产和设计。