The role of sucrose on enhancing properties of graphene oxide reinforced cement composites containing fly ash

Wei, Zhiqiang; Wang, Yuangui; Qi, Meng; Bi, Junfeng; Yang, Sen; Yuan, Xiaoya

doi:10.1016/j.conbuildmat.2021.123507

Cited by 20 publications

(9 citation statements)

References 43 publications

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“…When HO-G was added to a mortar at a content of 0.03% by cement mass, the NEW content was increased by 8% compared to that of the reference specimen. This suggested that a certain amount of HO-G could accelerate the hydration process of the cement paste to some degree at the early stage so that more hydration products were formed . After curing for 3 days, the NEW content of the pastes containing HO-G was generally higher than that of the reference samples.…”

Section: Resultsmentioning

confidence: 99%

“…The corresponding height profiles of the GO nanosheets (Figure S2b) reveal that the thickness of GO was about 1.9 nm, which composed of 2− 3 layers. 37 The AFM image (Figure S2c,d) of TRGO exhibited irregular shapes with a thickness of about 2.4 nm, which corresponded to multilayer graphene (6−7 layers), 38 while the HO-G sheet of the microscale lateral size (∼2 μm) was observed and its thickness was around 1.9 nm (Figure S2e,f), corresponding to three or four graphene layers, 25 indicating that TRGO layers were vigorously exfoliated under mechanical shear forces during the preparation of HO-G. The XRD patterns of GO, TRGO, and HO-G are presented in Figure S3.…”

Section: Resultsmentioning

confidence: 99%

“…This suggested that a certain amount of HO-G could accelerate the hydration process of the cement paste to some degree at the early stage so that more hydration products were formed. 37 After curing for 3 days, the NEW content of the pastes containing HO-G was generally higher than that of the reference samples. With the curing age increased to 28 days, a significant increase in the NEW content of the specimen incorporation of HO-G was observed, and its promotion was more progressive at higher content of HO-G, indicating that the addition of HO-G enhanced the degree of cement hydration, which was in good accordance to the above XRD analysis.…”

Section: Chloride-ion Penetrationmentioning

confidence: 86%

“…After curing for different ages, the samples were soaked in ethyl alcohol for 24 h and then ground to powder until it was passed through an 80 μm sieve and then predried at 65 °C in a vacuum oven until the weight remained unchanged. Approximately 1–2 g of dried sample powder was dehydrated at 1000 °C for 3 h. The NEW content was calculated by the following formula () where CW is the NEW content (%), L is the cement loss of ignition (1.25), m 1 is the weight of the sample before testing (g), m 2 is the weight of the sample after testing (g).…”

Section: Methodsmentioning

confidence: 99%

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Hydroxylated Graphene: A Promising Reinforcing Nanofiller for Nanoengineered Cement Composites

et al. 2021

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A very low dosage of graphene oxide (GO) can enhance the mechanical durability of cement composites, but the reinforcing enhancement is highly dependent on the uniform dispersion of graphene in the matrix. Carboxylic groups at GO nanosheets have a decisive effect on GO aggregation in an alkaline cement solution because they have a strong complexation ability with aqueous Ca2+ released by cement hydration and subsequently crosslinks the adjacent graphene sheets, causing the immediate coagulation of GO. The available methods of homogeneously dispersing GO in a cement slurry cannot completely eliminate this carboxylic-crosslinking-induced GO coagulation. In this study, many hydroxyl groups were introduced onto the edge and planar nanosheets to prepare water-soluble hydroxylated graphene (HO-G) by facile ball milling. The structure of HO-G was thoroughly characterized in detail, and its dispersion behavior in pure water and Ca(OH)2 was extensively investigated. These results showed that the prepared HO-G exhibited good hydrophilicity and excellent colloidal dispersion ability against high pH and Ca2+ ions compared to GO. The effect of HO-G on the workability, mechanical strength, and chloride penetrability of a cement mortar was further studied. At a content of 0.03% by cement mass, HO-G provided 28.62 and 21.19% enhancements of compressive strength and 3.85 and 7.89% enhancements of flexural strength at 3 and 28 days, respectively, while the non-steady-state migration coefficient decreased by 31.51% compared to the reference mortar. Compared to GO, a lower dosage of HO-G exhibited a similar reinforcing effect to cement composites with little adverse impact on the fluidity of the fresh cement slurry. Moreover, the addition of HO-G could refine the pore structure, accelerate the hydration process of cement to some degree, and generate more hydration products so that the structure of the cement mortar was densified. Considering its environmentally friendly preparation, HO-G, as a promising reinforcing nanofiller, could provide a new solution to develop nanoengineered cement composites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Chloride-ion Penetrationmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

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Hydroxylated Graphene: A Promising Reinforcing Nanofiller for Nanoengineered Cement Composites

et al. 2021

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“…The negative effect of GO on the fluidity of cementitious composites has been fully established. A recent finding by Wei et al [ 31 ] revealed a decrease of 7.9%, 10.0%, and 13.1% in the fluidity of fly ash—cement mortar containing 0.01, 0.02, and 0.03 wt.% of GO, respectively. In the same vein, Lee et al [ 32 ] reported a decrease in the slump of cementitious composite by 22.7–45.5% with the addition of GO.…”

Section: Introductionmentioning

confidence: 91%

Effects of Graphene Oxide and Crumb Rubber on the Fresh Properties of Self-Compacting Engineered Cementitious Composite Using Response Surface Methodology

et al. 2022

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Graphene oxide-modified rubberized engineered cementitious composite (GO-RECC) is attracting the attention of researchers because of the reported benefits of the GO and crumb rubber (CR) on the strength and deformation properties of the composite. While it is well established that GO negatively affects the workability of cementitious composites, its influence on the attainment of the desired self-compacting (SC) properties of ECC has not yet been thoroughly investigated, especially when combined with crumb rubber (CR). In addition, to simplify the number of trial mixes involved in designing SC-GO-RECC, there is a need to develop and optimize the process using Design of Experiment (DOE) methods. Hence, this research aims to investigate and model using response surface methodology (RSM), the combined effects of the GO and CR on the SC properties of ECC through the determination of T500, slump flow, V-funnel, and L-box ratio of the SC-GORECC as the responses, following the European Federation of National Associations Representing for Concrete (EFNARC) 2005 specifications. The input factors considered were the GO by wt.% of cement (0.02, 0.04, 0.06, and 0.08) and CR as a replacement of fine aggregate by volume (5, 10, and 15%). The results showed that increasing the percentages of GO and CR affected the fresh properties of the SC-GORECC adversely. However, all mixes have T500 of 2.4 to 5.2 s, slump flow of 645 to 800 mm, V-funnel time of 7.1 to 12.3 s, and L-box ratio (H2/H1) of 0.8 to 0.98, which are all within acceptable limits specified by EFNARC 2005. The developed response prediction models were well fitted with R2 values ranging from 91 to 99%. Through the optimization process, optimal values of GO and CR were found to be 0.067% and 6.8%, respectively, at a desirability value of 1.0.

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Graphene oxide synthesis using a top–down approach and discrete characterization techniques: a holistic review

2021

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The role of sucrose on enhancing properties of graphene oxide reinforced cement composites containing fly ash

Cited by 20 publications

References 43 publications

Hydroxylated Graphene: A Promising Reinforcing Nanofiller for Nanoengineered Cement Composites

Hydroxylated Graphene: A Promising Reinforcing Nanofiller for Nanoengineered Cement Composites

Effects of Graphene Oxide and Crumb Rubber on the Fresh Properties of Self-Compacting Engineered Cementitious Composite Using Response Surface Methodology

Graphene oxide synthesis using a top–down approach and discrete characterization techniques: a holistic review

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