Zhang Haiming, Gan Xingyu, Lu Zeyu, Li Laibo, Lu Lingchao
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China.
Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.
Nanomaterials (Basel). 2025 Mar 8;15(6):419. doi: 10.3390/nano15060419.
Graphene oxide (GO) significantly enhances cement hydration at the nanoscale; however, its tendency to complex and agglomerate with Ca⁺ in cement paste remains an unresolved issue. To improve the dispersibility and enhance the reinforcing effect of GO in cement paste, polycarboxylate (PC) superplasticizer was used to disperse GO (PC@GO). This study uniquely divided PC into two parts, with one modifying GO and the other acting as a water-reducing agent, to explore the effects on GO dispersion and analyze the rheological, carbon emission, mechanical, and hydration properties of cement paste. The experimental results show that the dispersion of GO modified by PC was improved, resulting in a significant enhancement in the performance of the cement paste containing PC@GO. The flexural and compressive strength of cement paste containing PC@GO cured for 7 days increased by 23.7% and 12.6%, respectively, meanwhile, the carbon-to-strength ratio (CI) decreased by 14.8%. In addition, the hydration acceleration period shortened by 7.50%, and the water absorption and porosity of the cement paste containing PC@GO decreased by 35.2% and 45.3%, respectively. Incorporating PC@GO into cement paste significantly enhances the dispersion of GO, substantially improves its mechanical properties, and positions it as a promising solution for the development of high-performance cementitious materials.
氧化石墨烯（GO）在纳米尺度上显著增强水泥水化；然而，其在水泥浆体中与Ca⁺络合和团聚的趋势仍是一个未解决的问题。为了提高氧化石墨烯在水泥浆体中的分散性并增强其增强效果，使用聚羧酸（PC）高效减水剂来分散氧化石墨烯（PC@GO）。本研究独特地将PC分为两部分，一部分用于改性氧化石墨烯，另一部分用作减水剂，以探讨对氧化石墨烯分散性的影响，并分析水泥浆体的流变性能、碳排放、力学性能和水化性能。实验结果表明，经PC改性的氧化石墨烯的分散性得到改善，使得含有PC@GO的水泥浆体性能显著增强。养护7天的含有PC@GO的水泥浆体的抗折强度和抗压强度分别提高了23.7%和12.6%，同时，碳强度比（CI）降低了14.8%。此外，水化加速期缩短了7.50%，含有PC@GO的水泥浆体的吸水率和孔隙率分别降低了35.2%和45.3%。将PC@GO掺入水泥浆体中显著提高了氧化石墨烯的分散性，大幅改善了其力学性能，并使其成为开发高性能胶凝材料的一种有前景的解决方案。
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