Mechanical Properties and Shrinkage Behavior of Concrete-Containing Graphene-Oxide Nanosheets

Abstract

Graphene oxide (GO) has been widely used as an additive due to its numerous unique properties. In this study, the compressive strength, flexural strength and elasticity modulus of concrete containing 0.02 wt%, 0.05 wt % and 0.08 wt % GO, and its dry shrinkage performance have been experimentally investigated. After the sample preparation, apparatus for compression test and flexural test were used to test the relevant properties of concrete containing GO. The dial indicators were used to measure the shrinkage of samples. The results indicate that GO can considerably improve the compressive strength, flexural strength, and elasticity modulus of concrete at the concrete age of 28 days by 4.04–12.65%, 3.8–7.38%, and 3.92–10.97%, respectively, which are substantially smaller than the increment at the age of 3 d by 5.02–21.51%, 4.25–13.06%, and 6.07–27.45% under a water-cement ratio of 0.35. It was also found that GO can increase the shrinkage strain of concrete. For example, at the age of 60 days, 0.02 wt%, 0.05 wt% and 0.08 wt% GO can increase the shrinkage strain of ordinary concrete by 1.99%, 5.79% and 7.45% respectively under a water-cement ratio of 0.49. The study has advanced our understanding on mechanical and shrinkage behavior of concrete containing GO.

Effect of Graphene Oxide Nanosheets on Physical Properties of Ultra-High-Performance Concrete with High Volume Supplementary Cementitious Materials

“…Based on the current literature and the results from this study, some mechanical properties of NC, UHSC, and UHPC with the addition of graphene nanosheets, GO nanosheets, and GNP are summarized in Table 4. Standard curing was employed for specimens in previous studies [20][21][22]24,34] and UHPC2 in present study while specimens prepared by Wang et al [35] were cured in 25 • C water for 3 months and followed by the air curing (room temperature) for 7 days. Steam curing was used for UHPC4 (see Table 3) in the present study.…”

“…It can be seen that both compressive strength and flexural strength for all types of concrete incorporating graphene nanosheets, GO nanosheets, and GNP were enhanced while the tensile strength (TS) was improved, where such results were available. This can be associated with the both nano size (or nucleation) effect and bridging effect of these nanosheets, with the former promoting the hydration reactions of the cementitious materials for improving the microstructure of concrete and the latter preventing the expansion of the microcracks through concrete matrix [13,34]. For the UHPC with STFB, such as the results given by Ren [24] and Meng et al [30] in addition to this study, the increasing rate of the flexural strength was significantly greater than that of the compressive strength for a given addition of GO nanosheets or GNP, which might be attributed to the improvement of the interface transition zone and the stronger bond between the concrete matrix and STFB [30].…”

Low-Carbon Composite Based on MOC, Silica Sand and Ground Porcelain Insulator Waste

“…As shown in Table 5, all samples reached high compressive strength which is usual for this type of material [11,35] and enables its application in load bearing structures. Both flexural and compressive strength were even higher than observed for 28 day samples of typical ordinary PC concrete by Chen et al [36]. The highest mechanical resistance exhibited material MOC-SPW10.…”

“…Although MOC has been known since 1867, very few researchers have focused on the thermal characteristics of this type of material. Certain exception represent studies [36,40], where authors tested MOC-based materials with silica sand aggregate and bulk density of ~2100 kg•m −3 . They reported on the thermal conductivity of MOC composites in the range of 2.1-2.2 W•m −1 •K −1 , which was lower compared to the thermal conductivity values presented in this paper.…”

Comparison Study on the Adsorption Behavior of Chemically Functionalized Graphene Oxide and Graphene Oxide on Cement

“…Devi et al [ 21 ] explored the compressive and tensile strengths of the mixtures with 0.08% GO, showing a better result compared to the rest of the mixes, and the sorptivity and permeability of the concrete with GO reduced with an increasing GO content. Huang et al [ 22 ] reported that GO can considerably improve the compressive strength, flexural strength, and elasticity modulus of concrete, but GO can increase the shrinkage strain of concrete. However, most of these works were focused on the optimization of the dosage-dependence of GO on the microstructure and macro-performance on hardened cement-based materials without considering that GO has an adverse impact on the flowability of fresh cement [ 23 , 24 , 25 , 26 ].…”