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.
Highlights
Concrete is the most extensively applied cement based composite material [1, 2] which is composed of cement, dinas, rebars and reinforced fibers
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%
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
Summary
Concrete is the most extensively applied cement based composite material [1, 2] which is composed of cement, dinas, rebars and reinforced fibers. 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. 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%. 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
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