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P. Jinchang et alii, Frattura ed Integrità Strutturale, 45 (2018) 156-163; DOI: 10.3221/IGF-ESIS.45.13
156
Graphene oxide on the microstructure and mechanical
properties of cement based composite material
Pang Jinchang, Wang Yeming
College of Architecture and Civil Engineering, Nantong Institute of Technology, Nantong, Jiangsu, 226000, China
pjcpangjc@163.com
ABSTRACT. To investigate the mixing amount of graphene oxide and water
cement ratio on the microstructure and mechanical properties of graphene
oxide reinforced cement based composite material, graphene oxide
suspension was developed using improved Hummers method, and the
structure, size and morphology of graphene oxide were represented using
Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and
AFM. The results demonstrated that the bending and compressive strength
of graphene oxide reinforced cement based composite material improved
firstly and then declined with the increase of the mixing amount of graphene
oxide, and moreover the improvement of the bending strength was obvious
than that of the compressive strength. When the content of graphene oxide
was 0.03%, the bending strength reached the maximum, 13.73 MPa. Under a
high water cement ratio, the addition of graphene oxide was more effective in
enhancing the strength of cement mortar. The representation of the
microstructure of cement based composite material with scanning electron
microscope (SEM) suggested that graphene oxide could optimize the
microstructure of cement hydration products, improve the pore structure of
set cement, reduce the volume of micropore in set cement, and increase the
compactness of set cement, i.e. apparently strengthen the toughening effect
of set cement. The research achievements are useful to improve the
mechanical properties of cement based composite materials.
KEYWORDS. Graphene oxide; Cement based composite material; Mechanical
properties.
Citation: Jinchang, P., Yeming, W., Graphene
oxide on the microstructure and mechanical
properties of cement based composite
material, Frattura ed Integrità Strutturale, 45
(2018) 156-163.
Received: 25.03.2018
Accepted: 02.06.2018
Published: 01.07.2018
Copyright: © 2018 This is an open access
article under the terms of the CC-BY 4.0,
which permits unrestricted use, distribution,
and reproduction in any medium, provided the
original author and source are credited.
INTRODUCTION
oncrete is the most extensively applied cement based composite material [1, 2] which is composed of cement, dinas,
rebars and reinforced fibers. Concrete has been extensively applied in the construction of buildings, roads, bridges
and dams for its advantages of extensive source of raw materials, low cost, simple preparation techniques and high
strength [3-6]. With the development of the construction field, concrete which was a traditional structural material with high
bearing capacity has developed to be more functional and environmental-friendly. Currently, high performance concrete
(HPC), an important development direction of concrete, is a cement based composite material with high strength, durability
C
http://www.gruppofrattura.it/VA/45/16.mp4
P. Jinchang et alii, Frattura ed Integrità Strutturale, 45 (2018) 156-163; DOI: 10.3221/IGF-ESIS.45.13
157
and workability [7, 8]. The cement composites have a noticeable feature of relatively high compressive strength and low
tensile and flexural strength, which belong to brittle materials. New carbon materials such as carbon fibers and carbon
nanotubes were used to enhance the strength of cement composites or provide the cement composites with improved
thermal performance. Nevertheless, the reinforcing materials such as carbon fibers and carbon nanotubes only play a
physical role in the cement composites and take no participation in the hydration and microstructural modification of the
cement, especially the pore structure and crystalline structure of cement paste. The dispersion of carbon fibers and carbon
nanotubes in the cement matrix is also challenging because of the hydrophobic surface of these reinforcing materials [9-11].
Therefore, it is urgent to find a new material which cannot only disperse uniformly in the aqueous system of hydrated
cement, but also improve the toughness of hardened cement paste by microstructural modifications. Graphene oxide is an
intermediate product in graphene preparation, which has many advantages as a reinforcing material such as excellent
mechanical, electrical and thermal properties [12-14]. It is easy to disperse uniformly in cements, which is beneficial to the
reinforcing effect. But the study on modifying traditional cement with graphene oxide is just getting started. Some scholars
have investigated the modification of cement based composite material with graphene oxide. Cao et al. [9] added the
modified graphene into cement and found that the addition of graphene could produce promotion and template effects on
the formation of hydrate crystal product to improve the strength and tenacity of cement-based materials. Babak et al. [15]
studied the mechanical properties of graphene oxide reinforced cement based composite material and found that the tensile
strength had an improvement of 48% when the weight proportion of graphene oxide was 1.5%. In the study of Liang et al.
[16], graphite oxide was dispersed to water via ultrasound and blended with polyvinyl alcohol solution. Then polyvinyl
alcohol/graphene oxide composite was prepared by volatilizing solvent via solution casting. When 0.7wt% of graphene
oxide was added, the tensile strength and Young's modulus of the composite was improved76% and 62% respectively
compared to pure polyving alcohol, and moreover the thermal decomposition of the composite was also improved. In this
study, graphene oxide was prepared using oxidation reduction to study the effects of different mixing amount of graphene
oxide and water cement ratio on the mechanical properties (bending and compressive strength) and microstructure of
cement based composite material and analyze the variation rules. This work aims to figure out the influencing mechanism
of the mixing amount of graphene oxide and water cement ratio on graphene oxide reinforced cement based composite
material to lay a basis for the application of graphene oxide in cement based material.
EXPERIMENTAL SCHEME
Experimental materials
aterials included graphite powder (granularity ≤ 30 μm, Sinopharm Chemical Reagent Co., Ltd., China),
concentrated sulfuric acid (H2SO4, 98% mass fraction), potassium permanganate (KMnO4, mass fraction ≥
99.5%), concentrated phosphoric acid (HPO3, mass fraction ≥ 85%), hydrogen peroxide (H2O2, 30% mass
fraction), polycarboxylate superplasticizer, ordinary portland cement P.O.42.5 and ISO standard sand.
Preparation of graphene oxide
1 g of graphite powder and 46 mL of concentrated sulfuric acid were added into a conical flask. The temperature was kept
below 3 °C. Then 6 g of KMnO4 was slowly added during stirring for 2 h of reaction at 15 °C and 10 h (20 h/30 h/40 h)
of reaction at 35 °C; the reactant turned to be green. Then 100 mL of deionized water was slowly added for 30 min of
reaction at 80 °C. After the addition of 15 mL of 30% hydrogen peroxide, the reactant turned to be golden yellow; the
reaction continued for 30 min. Next centrifugation and washing with deionized water were performed until there was no
2
4so in the washing liquid. The value of pH was adjusted to 7.0. It was processed by ultrasonic wave under 500 W for 30
min to obtain graphene oxide dispersion liquid after the addition of polycarboxylate superplasticizer. Its mass fraction was
controlled at 0.2%.
Representation of graphene oxide
The X-Ray Diffraction (XRD) of graphite and graphite oxide were detected using D/max 2200 PC X-ray diffractometer
(Rigaku, Japn). Cu Kα was X-ray source. The test was performed under 40 kV and 40 mA, and the angle was between 2°
and 70°.
IRPrestige-21 Fourier transform infrared spectrometer was used to represent the molecular structure and functional group
of graphene oxide and identify the category of the functional group. Specimens used for Fourier Transform Infrared
Spectroscopy (FTIR) was dried using a dryer and ground into powder. KBr pellet pressing method was used.
M
P. Jinchang et alii, Frattura ed Integrità Strutturale, 45 (2018) 156-163; DOI: 10.3221/IGF-ESIS.45.13
158
The size of graphene oxide nanosheets was detected using SPI3800N/SPA400 atomic force microscope (NSK, Japan). 0.5
% graphene oxide was diluted to 1500 times, and one drop was taken and dried on a monocrystalline silicon piece (10 mm
× 10 mm) at 25 °C.
Preparation of graphene oxide reinforced cement based composite material
It has been found that the addition of a small amount of nanometer material can significantly improve various performances
of composite materials [17, 18]. In this study, the mass fraction of graphene oxide was set as 0%, 0.01%, 0.03%, 0.05% and
0.07% to study the effects of the mixing amount of graphene oxide on the mechanical properties of test specimens. Water
cement ratio is an important parameter determining the strength, working performance and durability of cement based
composite material [19]. Water cement ratio was set as 0.35, 0.4, 0.45 and 0.5 to investigate the variation rules of the
mechanical strength of specimens under the same mixing amount of graphene oxide and different water cement ratio. 0.2%
polycarboxylate superplasticizer was added to all the specimens to solve the problem of reduced fluidity caused by the
addition of graphene oxide [20].
According to the preparation techniques described in Method of testing cements - Determination of strength (GB17671-
1999), cement mortar was put into a mould in a size of 40 mm ×40 mm × 160 mm for curing. Then the test specimens
were developed as per the mix proportion shown in Tab. 1 for the compressive and bending strength tests. All the specimens
were demoulded after 24 h of maintenance and then maintained in water under standard conditions, i.e. 20 °C and 90%
relative humidity, before test.
No. of
specimen
Cement/g
Water
cement ratio
Standard
sand/g
Graphene
oxide/wt%
Polycarboxylate
superplasticizer/wt
%
1
450
0.35
1350
0
0.2
2 0.35 0.01
3 0.35 0.03
4 0.35 0.05
5 0.4 0
6 0.4 0.03
7 0.45 0
8 0.45 0.03
9 0.5 0
10 0.5 0.03
Table 1: The mix proportion of cement mortar specimens.
Test on the mechanical properties of cement mortar
The test specimens were taken out from water and dried, and then the bending and compressive strength of the specimens
were detected under 50 N/s and 2400 N/s following GB17671-1999. In each group, three test specimens were tested, and
the average value was taken as the final result. Samples were collected from the crashed fracture surface of the test specimens
and immersed in absolute ethyl alcohol to stop hydration, and finally preserved in a vacuum drier. Energy spectrum was
analyzed using an American JSM-6360LV scanning electron microscope (SEM) and a spectrometer.
TEST RESULTS AND ANALYSIS
Analysis of Representation of Graphene Oxide
he XRD spectra of graphite powder and graphite oxide sample are shown in Fig. 1. The peak in the curve (a) of Fig.
1 was the characteristic peak of graphite, and the peak in the curve (b) was the characteristic peak of graphene oxide.
The results demonstrated that the interlayer spacing of graphene oxide increased from 0.33855 nm to 0.83859 nm,
which contributed to the introduction of oxygen-containing groups in graphite nanosheets under oxidation. Oxygen
connected with graphene in the form of a covalent bond, leading to the changes of laminated structure and diffraction peak
deviation of graphene oxide.
T
P. Jinchang et alii, Frattura ed Integrità Strutturale, 45 (2018) 156-163; DOI: 10.3221/IGF-ESIS.45.13
159
Figure 1: The XRD spectra of graphite and graphite oxide.
The FTIR spectrum of graphite oxide is shown in Fig. 2. As shown in Fig. 2, the stretching vibration and bending vibration
peaks of -OH in water molecule were at 3394 cm-1 and 1622 cm-1 respectively, the the stretching vibration and bending
vibration peaks of -OH in hydroxyl group were at 3141 cm-1 and 1401 cm-1 respectively, the stretching vibration peak of -
C=O in carboxyl group and carbonyl group at the edge of graphite oxide nanosheets was at 1727cm-1 , and the stretching
vibration peaks of C-O-C/-C-O were at 1116 cm-1 and 1075 cm-1. The existence of those characteristic peaks suggested that
oxygen-containing groups such as carboxyl group, epoxy group and carbanyl group were introduced in the preparation of
graphite oxide, i.e. graphite has been successfully oxidized.
Figure 2: The FTIR spectrum of graphite oxide.
Figure 3. AFM image of graphene oxide nanosheets.
AFM image of graphite oxide is shown in Fig. 3. It can be seen from Fig. 3 that the size and thickness of graphite oxide
sheet were 100-1000 and 0.7 nm, respectively, indicating that graphite oxide is one or two atom thick layers. It suggested
that the prepared graphite oxide with oxygen-containing functional group on the surface had favorable dispersion and
peeling.
Effects of the Mixing Amount of Graphene Oxide on the Mechanical Properties of the Test Specimens
The bending and compressive strength of the prepared graphene oxide reinforced cement based composite material were
tested, as the results are shown in Tab. 2 and 3.
P. Jinchang et alii, Frattura ed Integrità Strutturale, 45 (2018) 156-163; DOI: 10.3221/IGF-ESIS.45.13
160
No. of
test
specimen
Water
cement
ratio
Mixing amount
of graphene
oxide/(%)
Bending
strength/
MPa
Growth rate
of bending
strength/(%)
Compressive
strength/MPa
Growth rate of
compressive
strength/(%)
1 0.35 0 11.07 65.66
2 0.35 0.01 11.12 0.28 68.07 3.66
3 0.35 0.03 13.73 23.82 72.78 10.86
4 0.35 0.05 9.96 -10.21 55.42 -15.61
Table 2: The basic mechanical properties of cement mortar under different mixing amount of graphene oxide.
No. of test
specimen
Water
cement
ratio
Mixing amount
of graphene
oxide/(%)
Bending
strength/
MPa
Growth rate
of bending
strength/(%)
Compressive
strength/MPa
Growth rate of
compressive
strength/(%)
1 0.35 0 11.07 65.66
3 0.35 0.03 11.13 23.82 72.78 10.86
5 0.4 0 10.41 63.84
6 0.4 0.03 11.85 10.49 67.95 6.42
7 0.45 0 9.32 60.44
8 0.45 0.03 10.94 17.41 65.66 8.60
9 0.5 0 5.77 30.57
10 0.5 0.03 9.98 73.10 52.66 72.36
Table 3: The basic mechanical properties of cement mortar under different water cement ratios.
Figure 4: The variation of the bending and compressive strength of graphene oxide reinforced cement based composite material with
the changes of the mixing amount and water-cement ratio of graphene oxide.
Fig. 4(a) described the variation rules of the mechanical properties of graphene oxide reinforced cement based composite
material with the variation of the mixing amount of graphene oxide when the water-cement ratio was 0.35. As shown in the
figure, the influence of the mixing amount of graphene oxide on the compressive and bending strength of the test specimens
was consistent, i.e. increase firstly and then decrease; the compressive and bending strength was maximum when the mixing
amount of graphene oxide was 0.03%, and there was a growth rate of 23.83% and 10.85%, indicating that the improvement
of the bending strength was more obvious when the mixing amount of graphene oxide was within a certain range; when the
mixing amount exceeded 0.03%, the bending and compressive strength had significant decline and even became lower than
that of the blank samples. The first reason might be water demand significantly improved after the addition of cement-
based materials because of the extremely large surface energy and specific surface area of graphene oxide. Zhu [21] found
that the slump of cement paste which contained 0.05% graphene oxide reduced by 41.7%, which revealed that water demand
sharply increased with the increase of the content of graphene oxide. The second reason might be graphene oxide was prone
to gather because of van der Waals attraction when the content of graphene oxide was high. Moreover, many water
molecules around were absorbed, leading to inconsistent water-cement ratio and uneven hydrate formation.
Fig. 4(b) shows the variation rules of the mechanical properties of compound cement mortar under different water cement
ratio. The mechanical performance of the test specimens which were mixed with graphene oxide was superior to that of the
specimens which were not mixed with graphene oxide, and the larger the water-cement ratio, the lower the strength of the
P. Jinchang et alii, Frattura ed Integrità Strutturale, 45 (2018) 156-163; DOI: 10.3221/IGF-ESIS.45.13
161
test specimens. But when the water-cement ratio increased from 0.45 to 0.5, the strength of the test specimens which were
not mixed with graphene oxide significantly declined, and the bending and compressive strength changed more gently.
When the water-cement ratio was 0.5, the growth rates of the bending and compressive strength of the test specimens which
were not mixed with graphene oxide were maximum, 73.09% and 72.35% respectively. On one hand, residual water
evaporated during setting and hardening of cement paste, leading to the generation of large pores; on the other hand,
graphene oxide was prone to fill in the micro-pores of the cement paste to improve the structure under a high water cement
ratio. But graphene oxide as a nanometer material cannot fill in the large pores left after evaporation of water; therefore, the
overall decrease tendency of the strength did not change with the variation of the water cement ratio.
Effects of graphene oxide on the microstructure of graphene oxide reinforced cement-based composite material
Fig. 5 exhibits the SEM images of the test specimens under different mixing amount of graphene oxide (0, 0.01%, 0.03%
and 0.05%). The calcium silicate hydrate (CSH) gel and calcium hydroxide (CH) grew in the test specimens which were not
mixed with graphene oxide. There were many pores in the hardened cement paste, and the insufficient ettringite inside the
pores led to loose connection. But a large amount of ettringite scattering on the surface failed to play the roles of filling and
connection, which was not beneficial to the structure of cement mortar. With the addition of graphene oxide, tiny CSH gels
in a size of 1 μm distributed on the surface of cement particles like a roll leaf (Fig. 5(b)). When the content of graphene
oxide was 0.03%, the structure of the hardened cement paste was significantly improved, no isolated hydration products
were observed, and CSH structure in the shape of roll leaf which became more even and compact covered on the surface
of other crystals and cement particles (Fig. 5(c)). When the content of graphene oxide was 0.05%, a compact and even
structure which was composed of various hydrates was observed, but large pores and cracks appeared in the surrounding
and flocculent CSH gel scattered on the surface (Fig. 5(d)).
(a) The content of graphene oxide was 0. (b) The content of graphene oxide was 0.01%.
(c) The content of graphene oxide was 0.03%. (d) The content of graphene oxide was 0.05%.
Figure 5: The test specimens under different mixing amount of graphene oxide under scanning electron microscope.
P. Jinchang et alii, Frattura ed Integrità Strutturale, 45 (2018) 156-163; DOI: 10.3221/IGF-ESIS.45.13
162
CONCLUSIONS
raphene oxide solution was prepared using the improved Hummers method and mixed with cement mortar to
form cement-based composite material to investigate the effects of different mix proportion on the mechanical
properties and microstructure of graphene oxide reinforced cement based composite material. The following
conclusions were obtained.
(1) When the water cement ratio was fixed. The mechanical strength of cement mortar increased with the increase of the
content of graphene oxide and reached the maximum when the content of graphene oxide was 0.03%; the increase of the
bending strength (23.83%) was the most obvious. Those findings suggested the addition of graphene oxide could greatly
improve the toughness of cement.
(2) When the content of graphene oxide was 0.03%, cement mortar was the same with the traditional cement; the larger the
water cement ratio, the lower the strength. But the specimens which were added with graphene oxide effectively slowed the
decline of the strength of the specimens with high water cement ratio (W/C=0.5). Compared to the blank specimens, the
bending and compressive strength of the specimens which was mixed with graphene oxide had an improvement of 73.09%
and 72.35%.
(3) The analysis of the microstructure suggested that the addition of graphene oxide could affect the growth form and
number distribution of cement hydration products. The filling effect, hydration effect and nucleation effect of graphene
oxide was notable when the content of graphene oxide was within a certain range. Graphene oxide became the zone for
various hydration reactions because of its large specific surface area, which provided a better growth space for hydration
products. It could reduce the porosity of the hardened cement paste and make the structure of cement mortar tighter;
leading to the improved strength and ductibility.
The above research results which were similar to the research results of Xu et al. [22] were meaningful to improve the
bending strength and crack resistance of cement-based materials and extend their service life, which can provide a reference
for the future studies.
ACKNOWLEDGMENTS
his study was supported by the Key Laboratory of Architectural Structure (project no. CP12015005).
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/NLD (Gebruik deze instellingen om Adobe PDF-documenten te maken die zijn geoptimaliseerd voor prepress-afdrukken van hoge kwaliteit. De gemaakte PDF-documenten kunnen worden geopend met Acrobat en Adobe Reader 5.0 en hoger.)
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/ENU (Use these settings to create Adobe PDF documents best suited for high-quality prepress printing. Created PDF documents can be opened with Acrobat and Adobe Reader 5.0 and later.)
>>
/Namespace [
(Adobe)
(Common)
(1.0)
]
/OtherNamespaces [
<<
/AsReaderSpreads false
/CropImagesToFrames true
/ErrorControl /WarnAndContinue
/FlattenerIgnoreSpreadOverrides false
/IncludeGuidesGrids false
/IncludeNonPrinting false
/IncludeSlug false
/Namespace [
(Adobe)
(InDesign)
(4.0)
]
/OmitPlacedBitmaps false
/OmitPlacedEPS false
/OmitPlacedPDF false
/SimulateOverprint /Legacy
>>
<<
/AddBleedMarks false
/AddColorBars false
/AddCropMarks false
/AddPageInfo false
/AddRegMarks false
/ConvertColors /ConvertToCMYK
/DestinationProfileName ()
/DestinationProfileSelector /DocumentCMYK
/Downsample16BitImages true
/FlattenerPreset <<
/PresetSelector /MediumResolution
>>
/FormElements false
/GenerateStructure false
/IncludeBookmarks false
/IncludeHyperlinks false
/IncludeInteractive false
/IncludeLayers false
/IncludeProfiles false
/MultimediaHandling /UseObjectSettings
/Namespace [
(Adobe)
(CreativeSuite)
(2.0)
]
/PDFXOutputIntentProfileSelector /DocumentCMYK
/PreserveEditing true
/UntaggedCMYKHandling /LeaveUntagged
/UntaggedRGBHandling /UseDocumentProfile
/UseDocumentBleed false
>>
]
>> setdistillerparams
<<
/HWResolution [2400 2400]
/PageSize [612.000 792.000]
>> setpagedevice