Zhao Xin, Qiu Li, Kong Deyu, Huang Yangfei, Liu Jintao
Department Disaster Mitigation Structure, College of Civil Engineering, Tongji University, Shanghai 200092, China.
College of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310018, China.
Materials (Basel). 2023 Oct 6;16(19):6571. doi: 10.3390/ma16196571.
This work experimentally studies the mechanical properties and microstructure of cementitious composites reinforced with a three-dimensional graphene-carbon nanotube (CNT) hybrid. Firstly, the graphene-CNT (GC) hybrid is dispersed in cement pastes using ultrasonication and surfactant, and then, the effect of the GC hybrid on the early hydration of the cement pastes is investigated. The experimental results show that adding the GC hybrid shortens the setting stage of cement hydration and accelerates the early hydration process. Moreover, the macro- and micro-mechanical properties of each group are evaluated. The 7- and 28-day strength of the cement pastes improves with addition of the GC hybrid. Finally, the microstructural analysis demonstrates that the GC hybrid is reasonably well distributed in cement and forms a spatial network, which could bridge the cracks and compact the cementitious matrix.
本研究通过实验研究了三维石墨烯 - 碳纳米管（CNT）杂化物增强水泥基复合材料的力学性能和微观结构。首先，使用超声处理和表面活性剂将石墨烯 - CNT（GC）杂化物分散在水泥浆体中，然后研究GC杂化物对水泥浆体早期水化的影响。实验结果表明，添加GC杂化物缩短了水泥水化的凝结阶段并加速了早期水化过程。此外，还评估了每组的宏观和微观力学性能。添加GC杂化物后，水泥浆体的7天和28天强度有所提高。最后，微观结构分析表明，GC杂化物在水泥中分布合理，形成了空间网络，能够桥接裂缝并压实水泥基体。
