Abstract Early-age strength and fracture toughness of alkali-activated geopolymer cementitious materials are important factors affecting their engineering application. In this paper, early-age mechanical properties of reduced Graphene Oxide(rGO) geopolymer cement composites were investigated. By contrast to Graphene Oxide(GO), rGO have showed a competitive advantage in early-age mechanical properties of alkali-activated geopolymer cement. With 0.06 wt% rGO geopolymer cement composite, 1 day and 3 days flexural strength increased by 66.7% and 40%, 1 day and 3 days compressive strength increased by 28.5% and 23.9%, respectively, compared to the blank sample without rGO. The results indicated that the incorporation of rGO played a greater role in the flexural strength of geopolymer cement than on the compressive strength and promoted the development of fracture toughness. This provided a basis for application of rGO in geopolymer cement based materials.

中文翻译：

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还原氧化石墨烯对地质聚合物水泥早期力学性能的影响

摘要 碱活化地质聚合物胶凝材料的早期强度和断裂韧性是影响其工程应用的重要因素。在本文中，研究了还原氧化石墨烯（rGO）地质聚合物水泥复合材料的早期力学性能。与氧化石墨烯（GO）相比，rGO 在碱活化地质聚合物水泥的早期力学性能方面表现出竞争优势。与不含 rGO 的空白样品相比，使用 0.06 wt% rGO 地质聚合物水泥复合材料，1 天和 3 天的抗弯强度分别增加了 66.7% 和 40%，1 天和 3 天的抗压强度分别增加了 28.5% 和 23.9%。结果表明，rGO 的掺入对地聚合物水泥的抗弯强度比对抗压强度的作用更大，并促进了断裂韧性的发展。这为rGO在地质聚合物水泥基材料中的应用提供了基础。