In this paper,the dispersion mechanism of thermal reduction graphene oxide(TRGO)and graphene oxide(GO)in cement mortar environment was studied,and the effect of single and multiple mixing of these two conductive phases on the mechanical/electrical properties of mortar was explored.The results show that GO can promote the dispersion of TRGO in calcium-rich and high-alkali environment,and the optimal disper-sion mass ratio is 3∶10 wt％.Compared with TRGO mixed alone,the compound mixing of GO promotes the formation of sheet structure and interweaving of mortar hydration products,which significantly improves me-chanical properties.When GO:TRGO=0.3∶1.0 wt％,the flexural and compressive strength of 28 d cements increases by 21.34％and 34.52％compared with single mixed TRGO,but the mechanical properties decrease with the increase of mixing amount.The electrical conductivity of cement mortar increases with the increase of GO and TRGO conductive phases.When GO∶TRGO=0.12∶0.4 wt％,the resistivity of the 28-day age cement shows a sudden change,indicating that the system has a percolation threshold.Under the optimal dispersion ra-tio,when TRGO'amount exceeds 0.7 wt％,the increasing content on the resistivity tends to be flat and lower,implying that 0.7 wt％TRGO is the threshold of adding content to the resistivity.
关键词
氧化石墨烯/热还原氧化石墨烯/砂浆/力学性能/电学性能
Key words
graphene oxide/thermal reduction of graphene oxide/mortar/mechanical properties/electrical proper-ties
维普
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