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Chinese Journal of Materials Research  2018, Vol. 32 Issue (3): 233-240    DOI: 10.11901/1005.3093.2016.679
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Microstructure and Properties for Composites of Graphene Oxide/Cement
Shenghua LV1(), Jia ZHANG1, Xiaoqian LUO1, Linlin ZHU1, Caihui NI2
1 College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
2 Nantong New Building Materials Co. Ltd., Nantong 226299, China;
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Shenghua LV, Jia ZHANG, Xiaoqian LUO, Linlin ZHU, Caihui NI. Microstructure and Properties for Composites of Graphene Oxide/Cement. Chinese Journal of Materials Research, 2018, 32(3): 233-240.

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Abstract  

Graphene oxide (GO) nanosheets were prepared via oxidation treatment of graphite and then the dispersion liquid of which was prepared by ultrasound vibration in. The thickness and plane size of GO nanosheets are less than 11.95 nm and within 50~900 nm respectively. There are many chemical groups such as hydroxyl, carbonyl and epoxy groups on GO nanosheets. The prepared composite of graphene oxide/cement composited of ordinary cement and 0.03% GO nanosheets presents the regular micromorphology of ordinary cement, which consists of polyhedron-like cement hydration crystals by interweaving, penetrating and embedding each other. The compressive and flexural strength of the composite of GO/cement after curing for 28 days increase by 76.2% and 86.1% respectively, in comparison to that of the ordinary cement without GO addition, correspondingly the porosity and average pore diameter as well as cracks decrease obviously too.
Key words:  inorganic non-metallic materials      graphene oxide      cement matrix      cement hydration products      microstructure     
Received:  29 January 2017     
ZTFLH:  TU528.572  
Fund: Supported by National Natural Science Foundation of China (No. 21276152), Scientific and Technological Coordinate Project of Shaanxi Province (No. 2016KTCL01-14).
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Articles by authors
Shenghua LV
Jia ZHANG
Xiaoqian LUO
Linlin ZHU
Caihui NI

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.679     OR     https://www.cjmr.org/EN/Y2018/V32/I3/233

Fig.1  FTIR (a) and XPS spectra (b) of graphite and GO
Fig.2  AFM image and size distribution of GO nanosheets (a) AFM images of GO sheets, (b, c and d) Side view of AFM images of GO nanosheets, (e) Size distribution of GO nanosheets
Fig.3  SEM images of control samples without GO and at 28 d (a) Magnified 500 times; (b) Magnified 5000 times; (c) Magnified 200000 times
Fig.4  SEM images of cement composites doping with 0.03% GO at 28 d (a) Large-area regular microstructure; (b) Flower-like patterns; (C) Flower-like patterns; (d) Flower-like patterns; (e) Interweaving structure of polyhedron-like cluster crystals; (f) Aggregating structure of polyhedron-like crystals
Fig.5  SEM Images of cement composites at 28 d (a) SEM image at 5 kV; (b) SEM image at 20 kV; (c) SEM image at large magnification; (d) SEM image at 5 kV; (e) SEM image at 20 kV; (f) SEM image at large magnification
Component and content/%
C O Ca Al Si Mg Fe S
Control sample* 2.46 35.92 43.27 3.26 10.48 1.49 1.51 1.61
EDS1 7.07 34.91 38.97 3.49 9.06 3.59 1.68 1.21
EDS2 4.32 37.19 38.51 5.34 9.39 3.65 1.12 1.48
EDS3 7.46 31.57 39.28 5.26 9.49 2.49 1.10 1.35
EDS4 3.11 10.49 37.69 3.33 8.65 3.49 2.06 1.29
Table 1  Element composites of cement hydration crystals
Fig.6  XRD patterns of cement hydration products
Total pore area/m2g-1 Median pore diameter/nm Average pore diameter/nm Apparent density/gmL-1 Porosity/%
Control sample 26.3 35.4 43.5 2.31 35.52
GO/cement composites 12.6 15.3 16.2 2.45 11.38
Table 2  Pore structure of hardened cement paste mixed with GONs at 28 d
GO dosage/% Compressive strength/MPa Flexural strength/MPa
3 d 7 d 28 d 60 d 3 d 7 d 28 d 60 d
0 21.8±1.1 30.4±1.4 43.6±1.1 45.3±1.0 2.8±0.14 5.6±0.2 8.2±0.4 9.2±0.5
0.03 32.7±1.3 51.8±1.5 77.5±1.8 79.6±1.9 5.6±0.2 8.5±0.4 15.7±0.6 16.2±0.6
Table 3  Compression and flexural strength of the cement composites
Fig.7  Regulation mechanism of GO on cement hydration products and its microstructure (a) hydration (b) template effect (c) regular flower-like structure
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