Revealing the dependence of the physiochemical and mechanical properties of cement composites on graphene oxide concentration

Abstract

This paper presents a comprehensive study to evaluate the influence of graphene oxide (GO) concentration on the physiochemical and mechanical properties of cement mortar composites. Scanning electron micrographs (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR) characterizations were performed to understand the correlation between physicochemical and observed axial tension and compression properties of GO-cement mortar composites. The results show considerable concentration dependence, with the optimum concentration of 0.1% GO that increases the tensile and compressive strength of the composite by 37.5% and 77.7%, respectively. These results are explained by the stronger bonding of calcium silicate hydrate (C-S-H) components in the cement matrix in the presence of GO sheets and the dependence of their dispersions and possible aggregation.

Self‐Assembled Graphene Hydrogel Composites for Selective Dye Removal

“…With rGOH, the carbonyl CO stretching (1730 cm −1 ), aromatic CC (1620 cm −1 ), carboxy CO (1415 cm −1 ), epoxy CO (1228 cm −1 ), and CO (1070 cm −1 ) which were observed are all within the ranges reported elsewhere. [ 9,35 ] For the rGOSH, the spectra below 800 cm −1 (Figure 5), which is the fingerprint region of starch, exhibit the skeletal mode vibration of glucose pyranose rings. [ 36 ] The peak in the region of 950–900 cm −1 , attributes to the skeletal mode vibration of α‐1,4 glycosidic bond (CHOCH) between the pyranose rings.…”

Evaluation of the dispersion of metakaolin–graphene oxide hybrid in water and cement pore solution: can metakaolin really improve the dispersion of graphene oxide in the calcium-rich environment of hydrating cement matrix?

“…[1][2][3][4][5][6][7][8][9][10] For instance, with 0.05% of GO incorporation in mortar samples, the 28 days compressive and tensile strength was increased by 41% and 25%, respectively, compared to the plain sample. 11 Also, the reinforced cement paste sample with GO dosage of 0.05% showed Young's modulus approximately 18% higher than the reference one. 12 On the negative side, the main challenge that may limit the use of GO arises from its dispersion status in cementitious host matrices as the GO nanosheets tend to agglomerate owing to intense van der Waals forces among them coupled with their high surface area.…”

Investigating the reinforcing mechanism and optimized dosage of pristine graphene for enhancing mechanical strengths of cementitious composites

“…This leads to the agglomeration of PRGs and the formation of multi-layers PRGs, resulting in the hindrance to the enhancement of PRGs to the hydration process, as well as their interaction with cementitious gels. 27,49,53 Figs. 3(c) and 4(c) show the optimal PRG range for both compression and tension at 7 day and 28 day ages of PRGcement based mortars.…”