Study on modification mechanism of workability and mechanical properties for graphene oxide-reinforced cement composite

Suo, Yuxia; Guo, Rongxin; Xia, Haiting; Yang, Yang; Feng, Yan; Ma, Qianmin

doi:10.1177/1847980420912601

Cited by 38 publications

(21 citation statements)

References 33 publications

(43 reference statements)

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“…The distance between the electrode and the edge of the specimen was kept at 5 mm for all samples. The mixing, casting, demolding and curing processes for all specimens were similar to those in previous works [ 27 ]. To avoid effects caused by moisture and polarization, all specimens were dried for 27 h before testing.…”

Section: Methodssupporting

confidence: 54%

“…According to previous compressive strength test results [ 27 ], samples with w/c = 0.35 feature the best compressive strength, which increases by 24% compared to cement paste without GO. Thus, they were selected for the electrical resistivity test with different moisture contents when GO concentrations change from 0.05 to 0.2 wt.%.…”

Section: Resultsmentioning

confidence: 84%

“…Firstly, GO regulates the hydration product to form a compact microstructure and increases the intrinsic conductivity of the cement matrix through ionic conduction. According to our previous research [ 27 ], the microstructure of cement with appropriate GO concentration (i.e., 0.05 wt.%) indicates a more compact and regular microstructure since the cracks and holes decrease. As a result, a conductive path in cement is easy to form and resistivity decreases.…”

Section: Resultsmentioning

confidence: 94%

“…As a result, a conductive path in cement is easy to form and resistivity decreases. For cement without GO or with a high content of GO (i.e., 0.15 wt.%), loose and irregular microstructures are observed [ 27 ], which destroy the conductive path and increase resistivity, as shown in Figure 2 b. Secondly, well-dispersed GO plays a certain role in decreasing electrical resistivity, because conductivity of the GO sheet (13 S/m) is much higher than that of the cement matrix (0.0105–0.0451 S/m) and deionized water (0.0004 S/m). For the specimens with concentrations over 0.05 wt.%, their resistivities are close to or higher than the control specimen.…”

Section: Resultsmentioning

confidence: 99%

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Study of Piezoresistive Behavior of Smart Cement Filled with Graphene Oxide

et al. 2021

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A cement-based piezoelectric composite, modified by graphene oxide (GO), was prepared to study piezoresistive capacity. The testing confirms that GO is more effective than other carbon nanomaterials at improving piezoresistive sensitivity of cement-based composites, because the content of GO in cement paste was much lower than other carbon nanomaterials used in previously published research. Further investigation indicates that the addition of GO significantly improved the stability and repeatability for piezoresistive capacity of cement paste under cycle loads. Based on experiment results, the piezoresistive sensitivity of this composite depended on GO content, water-to-cement weight ratio (w/c) and water-loss rate, since the highest piezoresistive gauge factor value (GF = 35) was obtained when GO content was 0.05 wt.%, w/c was 0.35 and water-loss rate was 3%. Finally, microstructure analysis confirmed that conductivity and piezoresistivity were achieved through a tunneling effect and by contacting conduction that caused deformation of GO networks in the cement matrix.

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Section: Methodssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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Study of Piezoresistive Behavior of Smart Cement Filled with Graphene Oxide

et al. 2021

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“…Tong et al [ 24 ] found GO significantly improved the compressive strength of concrete but had little effect on its freeze-thaw resistance. At the same time, GO promoted the generation of high-density gels, reduced the porosity of the paste, and improved the chloride ion erosion resistance [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphene Oxide on Properties of Alkali-Activated Slag

et al. 2021

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Alkali-activated materials, a new kind of low-carbon cement, have received extensive attention. While in order to obtain excellent functions, the modification of alkali-activated materials by nano-materials has become one of the important research directions of alkali-activated materials. Therein, the hydration property, mechanical properties, and action mechanism of the alkali-activated slag with and without graphene oxide (GO) were analyzed and evaluated. Results showed the compressive strength of mortar decreased at 3 days and 28 days by adding GO. While the flexural strength of mortar cured for different ages increased with increasing GO content, and the flexural strength increasing rate reached up to 15.94% at 28 days, thus, the toughening effect of GO was significant. GO accelerated the hydration process of alkali-activated slag because the functional groups offered nucleation sites to induce the generation of more hydration products. Furthermore, the addition of GO increased the number of harmless pores and reduced the pore size, but also introduced a large number of harmful pores, resulting in the reduction of compressive strength.

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