کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4913858 | 1428774 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
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چکیده انگلیسی
Due to its high aspect ratio and outstanding tensile strength, graphene oxide (GO) can dramatically reduce the brittleness of cement-based materials. In this paper, GO nanosheets were successfully synthesised using the modified Hummers' method. Effects of the GO on the fluidity, mechanical properties of alkali-activated slag (AAS) mortars and the microstructure of the AAS pastes were studied. It is found that addition of the GO caused a significant reduction in fluidity and a slight decrease in the compressive strength of the hardened mortars. However, the GO improved the flexural strengths by 20% with a dosage of 0.01 wt% after 7 days. Large-scale layered double hydroxides (LDHs) were observed using SEM, the compositions of which were identified and EDS and XRD. A possible mechanism of the formation of LDHs in the GO-AAS system is proposed. Due to the Mg2+/Al3+ decomposed from the slag and the Al(OH)4â formed in the high pH condition in the GO-AAS system, the reaction pathway of LDHs can be regarded as aMg2++Al(OH)4-+(2a-2)OH-+xH2O+A-âMgaAl(OH)2+2aA·xH2O(s) This research provides a further understanding of the effect of graphene oxide which has a potential application of GO in AASC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 132, 1 February 2017, Pages 290-295
Journal: Construction and Building Materials - Volume 132, 1 February 2017, Pages 290-295
نویسندگان
Xiao Hong Zhu, Xiao Juan Kang, Kai Yang, Chang Hui Yang,