Micromechanical Properties of GO-RC Interface Transition Zone under Freeze-Thaw Cycles

被引：0
|
作者：
Guo K. [1 ]
Ma H. [1 ]
Yang F. [1 ]
Zhao T. [1 ]
机构：
[1] School of Civil Engineering, Shenyang Jianzhu University, Shenyang
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2020年 / 23卷 / 01期
关键词：
Freeze-thaw cycle; Graphene oxide(GO); Interfacial transition zone(ITZ); Microstructure; Recycled concrete(RC);
D O I：
10.3969/j.issn.1007-9629.2020.01.034
中图分类号：
学科分类号：
摘要：
In order to study the effect of graphene oxide(GO) on the interface transition zone(ITZ) of recycled concrete under freeze-thaw cycle, the mechanical properties of the interfacial transition zone of aggregate-new mortar(AG-NM) and new mortar-old mortar(NM-OM) were studied by nano-indentation technique. The results show that the mechanical properties of graphene oxide recycled concrete(GO-RC) and ordinary recycled concrete(ORC) decrease in varying degrees after 100 freeze-thaw cycles. Due to the condensation nucleus effect of GO in the hydration process, the number of high strength hydration products is increased in ITZ. The volume fraction of high density calcium silicate hydrate(HD C-S-H) is 7.02%14.10% higher than that in the ORC. Elastic modulus of GO-RC increases by 14.79%17.74% and its hardness increases by 42.11%60.80% in ITZ. According to the relationship between the microscopic mechanical properties and the macroscopic mechanical properties of concrete, it can be concluded that graphene oxide can enhance the microstructure of the recycled concrete so as to improve the frost resistance. © 2020, Editorial Department of Journal of Building Materials. All right reserved.
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页码：230 / 238
页数：8
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