Lee Chaewon, Lee Hoyoung, An Jinwoo, Nam Boo Hyun
Department of Civil Engineering, College of Engineering, Kyung Hee University, Yongin 17104, Republic of Korea.
Department of Civil Engineering, College of Engineering and Computer Science, The University of Texas at Rio Grande Valley, Edinburg, TX 78539, USA.
Materials (Basel). 2025 Aug 18;18(16):3864. doi: 10.3390/ma18163864.
Geopolymer concrete uses a geopolymer binder instead of traditional Portland cement; thus, it reduces carbon emissions by a significant amount. In this study, Edge-Oxidized Graphene Oxide (EOGO), a carbon-based nanomaterial, was added into a metakaolin-based geopolymer, and its effect on the mechanical and rheological properties of the mixture was investigated. EOGO was added into the mixture at 0% (control), 0.1%, 0.5%, and 1% of the metakaolin mass. Several experiments were conducted to characterize the properties of the metakaolin-EOGO (MKGO) geopolymer, including its compressive strength, free-free resonance column (FFRC), void content, water absorption, setting time, flow, and rheology. It was found that the compressive strength and stiffness showed their maximum values and the void content was minimized at 0.1% EOGO. In addition, as the EOGO addition rate increased, the setting time tended to shorten, and the fluidity tended to decrease. This suggests that 0.1% EOGO is the most optimal content in metakaolin paste. This study confirms that EOGO is an additive material that can improve the performance of metakaolin-based geopolymers and presents opportunities for the development of sustainable construction materials through optimization of EOGO addition.
地聚合物混凝土使用地聚合物粘结剂而非传统的波特兰水泥；因此，它能大幅减少碳排放。在本研究中，将一种碳基纳米材料——边缘氧化石墨烯（EOGO）添加到偏高岭土基地聚合物中，并研究其对混合物力学和流变性能的影响。EOGO按偏高岭土质量的0%（对照）、0.1%、0.5%和1%添加到混合物中。进行了多项实验来表征偏高岭土 - EOGO（MKGO）地聚合物的性能，包括其抗压强度、自由 - 自由共振柱（FFRC）、孔隙率、吸水率、凝结时间、流动性和流变学。结果发现，抗压强度和刚度在EOGO含量为0.1%时达到最大值，孔隙率最小。此外，随着EOGO添加率的增加，凝结时间趋于缩短，流动性趋于降低。这表明0.1%的EOGO是偏高岭土浆体中的最佳含量。本研究证实EOGO是一种能改善偏高岭土基地聚合物性能的添加剂材料，并通过优化EOGO添加量为可持续建筑材料的开发提供了机会。
