Dipta Iftekhar, Ng Kam, Chadwick Jacob, Lau Chooi Kim, Yu Hua, Johnson Patrick Alfred
Department of Civil and Architectural Engineering and Construction Management, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA.
Department of Chemical Engineering, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA.
Materials (Basel). 2025 Jun 12;18(12):2774. doi: 10.3390/ma18122774.
Past studies have offered insights into how graphite-derived graphene oxide (GDGO) can improve the mechanical properties and alter microstructural characteristics of concrete. These advantages can significantly impact the construction industry regarding cost, sustainability, and efficiency. However, the high cost of GDGO can make commercial implementation unattainable. This paper comprehensively investigates coal-derived GO as a cost-saving alternative to commercial GDGO while achieving comparable concrete performance. Different GO proportions were incorporated into concrete mixes through laboratory experiments to determine the effect on mechanical properties and microstructures. In this research, concrete mixes were formulated by replacing a portion of cement with coal-derived GO and adding this GO as an additive to concrete at varying percentages (0.05%, 0.10%, 0.25%, 0.50%, 1%, and 1.5% by weight of cement). The study revealed flexural, split tensile, and compressive strength improvements of 3.3%, 2.3%, and 21.2%, respectively, at a minimal 0.05 wt.% GO replacement. Optimal inclusions of GO as an additive ranging from 0.05 to 0.25 wt.% were identified to exhibit a maximum increase in mechanical properties. More precisely, adding 0.10 weight percent of GO as an additive to concrete showed increases in flexural, split tensile, and compressive strengths of 14.05%, 9.7%, and 34.2%, respectively. Furthermore, detailed analyses, including modulus of elasticity, Poisson's ratio, heat of hydration, and microstructural analysis provided comprehensive insights into the enhanced mechanical performance of GO-incorporated concrete. Additionally, the study revealed a lower Ca/Si ratio in GO concrete, further validating the reinforcing properties of the GO.
过去的研究深入探讨了石墨衍生的氧化石墨烯（GDGO）如何改善混凝土的力学性能并改变其微观结构特征。这些优势在成本、可持续性和效率方面会对建筑业产生重大影响。然而，GDGO的高成本使得商业应用难以实现。本文全面研究了煤衍生的氧化石墨烯（GO）作为商业GDGO的一种节省成本的替代品，同时实现可比的混凝土性能。通过实验室实验将不同比例的GO掺入混凝土混合料中，以确定其对力学性能和微观结构的影响。在本研究中，通过用煤衍生的GO替代一部分水泥，并以不同百分比（按水泥重量的0.05%、0.10%、0.25%、0.50%、1%和1.5%）作为添加剂添加到混凝土中来配制混凝土混合料。研究表明，在最低0.05 wt.%的GO替代量下，弯曲强度、劈裂抗拉强度和抗压强度分别提高了3.3%、2.3%和21.2%。确定了作为添加剂的GO的最佳掺入量范围为0.05至0.25 wt.%，以实现力学性能的最大提高。更确切地说，向混凝土中添加0.10重量百分比的GO作为添加剂时，弯曲强度、劈裂抗拉强度和抗压强度分别提高了14.05%、9.7%和34.2%。此外，详细分析，包括弹性模量、泊松比、水化热和微观结构分析，为含GO混凝土增强的力学性能提供了全面的见解。此外，研究还发现GO混凝土中的Ca/Si比更低，进一步验证了GO的增强性能。
