Enhanced dynamic mechanical properties of cement paste modified with graphene oxide nanosheets and its reinforcing mechanism
Enhanced dynamic mechanical properties of cement paste modified with graphene oxide nanosheets and its reinforcing mechanism
复制标题
氧化石墨烯纳米片改性水泥浆体增强动态力学性能及其增强机理
DOI：
10.1016/j.cemconcomp.2018.07.001
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发表时间：
2018-10-01
影响因子：
10.5
通讯作者：
Khayat, Kamal H.
中科院分区：
文献类型：
--
作者：
Long, Wu-Jian;Wei, Jing-Jie;Khayat, Kamal H.
研究了氧化石墨烯（GO）纳米片对水泥浆体静态和动态力学性能以及微观结构的影响。动态机械测试结果表明，含有 0.05、0.10 和 0.20 wt.% GO 的浆料的损耗因子分别改善了 31%、58% 和 77%。当GO含量为0.1 wt.%时，最大储能模量为52%，而GO含量为0.05 wt.%和0.2 wt.%的水泥浆体的28天弯曲和压缩强度分别比对照浆体高12%-26%和2%-21%。对硬化水泥浆体的TGA分析和微观结构分析表明，添加GO可以促进水泥水化，细化毛细孔结构，减少气孔含量，提高浆体的密度。基于内部接触表面、孔隙率和非均匀应力分布分析，还揭示了掺有 GO 的浆料的动态机械性能增强机制。
The effect of graphene oxide (GO) nanosheets on the static and dynamic mechanical properties and microstructure of cement paste has been investigated. The results of dynamic mechanical testing revealed that loss factors of the pastes containing 0.05, 0.10, and 0.20 wt.% of GO were improved by 31%, 58%, and 77%, respectively. The maximum storage modulus of 52% was observed at a GO content of 0.1 wt.%, while the 28-d flexural and compressive strengths of the cement pastes with GO contents of 0.05 and 0.2 wt.% exceeded those of the control pastes by 12%-26% and 2%-21%, respectively. TGA analysis and microstructural analysis of the hardened cement pastes showed that the added GO could promote cement hydration, refine the capillary pore structure, reduce the air voids content, and improve the density of pastes. Dynamic mechanical properties reinforced mechanisms of paste incorporated with GO were also revealed based on the internal contact surfaces, porosity, and non-uniform stress distribution analysis.