Effect & Mechanisms of Carbon Nanotube on Early Age Hydration Performance of Cement-Based Materials

Описание: Presented By: Zhen Li, Harbin Engineering University
The macroscale properties of cement-based materials are largely depended on their hydration performance. The effects and mechanisms of graphene oxide (GO)/graphene (GR) on the hydration performance of cement-based materials are not clear and should be further investigated. This paper aims at studying the effect of GO (0.01 wt.% and 0.03 wt.%) and GR (0.1 wt.%, 0.3 wt.% and 0.5 wt.%) on the hydration performance of cement-based materials, respectively. Results demonstrated that the addition of 0.01 wt.% and 0.03 wt.% GO has a limited accelerating effect on the cement hydration of fly ash-cement-based materials (FA-CBM) at the early stage. However, it can affect the overall hydration of FA-CBM by accelerating the secondary hydration of FA at the later stage. In addition, GO can decrease the total pore volume and the harmful pore volume, refine the CH crystal. The peaks of the heat flow and the total cumulative hydration heat of CBM can be improved by 0.34h and 8.08 J/g due to the inclusion of 0.1 wt.% of GR. Furthermore, GR can increase the polymerization degree of C-S-H and the amount of CH crystal, which may be helpful to improve the macroscale properties of CBM.