Effect of graphene oxide (GO) on the hydration and dissolution of alite in a synthetic cement system

Zhu, Xiaohong; Kang, Xiaojuan

doi:10.1007/s10853-019-04266-1

Cited by 23 publications

(9 citation statements)

References 35 publications

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“…A significant difference of the alkaline treating agent from other procedures consists in formation of the fibers ( Figs. 10 c and A5 ) typical for tricalcium silicate (C 3 S, alite) present in the slag materials [44] , [45] .…”

Section: Resultsmentioning

confidence: 99%

Ultrasound irradiation as an effective tool in synthesis of the slag-based catalysts for carboxymethylation

Kholkina

Kumar

Eränen

et al. 2021

Ultrasonics Sonochemistry

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Highlights Synthesis of low-cost catalysts from desulfurization slag. Application of ultrasonication for process intensification. Increase of surface area from 6 to 49 m 2 /g. Development of texture and crystal morphology. Strong improvement of catalytic activity in carboxymethylation of cinamyl alcohol.

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Section: Resultsmentioning

confidence: 99%

Ultrasound irradiation as an effective tool in synthesis of the slag-based catalysts for carboxymethylation

Kholkina

Kumar

Eränen

et al. 2021

Ultrasonics Sonochemistry

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show abstract

“…For instance, the improvement in the flexural strength of specimen S7G5 was about 13%, compared with 17% at seven days. This implies the role of GO in accelerating the hydration process at early stages, resulting in more dense and interlocked hydration products [ 23 , 46 ]. Another observed result reveals that those specimens with high SF content, compared with the GO ratio, started to gain more strength at 28 days than at 7 days.…”

Section: Resultsmentioning

confidence: 99%

“…The second step to improve the GO performance in the cement composite is to overcome the possible re-agglomeration of graphene sheets in the cement matrix. One of the main reasons that would trigger such aggregation is the formation of a very basic medium after the dissolution of cement minerals: alite (C 3 S), belite (C 2 S), aluminate (C 3 A), and ferrite (C 4 AF), which increases the concentration of the divalent calcium ions (Ca ++ ) within the cement matrix at the early stages of the hydration process [ 23 , 24 ]. Many measures have been used before to maintain the dispersion of the GO within the cement matrix, such as mechanical ultra-sonication and the use of surfactants [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Use of Graphene Oxide and Silica Fume in Cement-Based Composites

et al. 2021

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Incorporation of graphene oxide (GO) and silica fume (SF) to cement composites enhances their mechanical properties if suitable proportional amounts of GO and SF are used. This study presents a simplified approach to determine experimentally the optimum GO and SF contents that should be added to the cementitious mixture to obtain a proper and stable dispersion of GO sheets within the cement matrix. Composite mortar specimens with different GO and SF contents were designed and tested under flexural and compression loading. The phase formation and the microstructure of selected samples were also investigated to give an in-depth interpretation of the test results. The main criterion to determine the GO and SF contents was the ultimate strength required of the GO–cement composite. It was found that there was a composite interaction between the SF and GO contents in the cementitious mixture, which an envelope surface could describe if all other mix design parameters are kept constant.

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“…Graphene oxide (GO) and graphene nanoplatelets (GNPs) may be two of the most widely used GBNFs to tune the material properties of CBMs [10,11]. Compared with GO, that is widely used to enhance the mechanical properties of CBMs due to its stronger surface actions [12][13][14], GNPs that are composed of several layers of graphene with the diameter of several microns and thickness of less than 100 nanometers shows benefits to enhance the electrical properties of CBMs owing to its high electrical conductivity [15]. The improvement in the mechanical properties of CBMs by GBNFs is generally attributed to the enhanced cement hydration, tightly packed, and uniformly distributed hydration crystals, and decreased or eliminated cracks and flaws of the material matrix [16].…”

Section: Introductionmentioning

confidence: 99%

May the Piezoresistivity of GNP-Modified Cement Mortar Be Related to Its Fractal Structure?

et al. 2021

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High piezoresistivity of cement-based composites tuned by conductible fillers provides a feasible way to develop self-sensing smart structures and buildings. However, the microstructural mechanisms remain to be properly understood. In the present work, the piezoresistivity of cement mortar with different dosages of graphene nanoplatelets (GNPs) was investigated, and the microstructure was assessed by electron scanning microscopy (SEM) and mercury intrusion porosimetry (MIP). Two surface fractal models were introduced to interpret the MIP data to explore the multi-scale fractal structure of the GNP-modified cement mortars. Results show that the incorporation of GNPs into cement mortar can roughen the fracture surfaces due to the GNPs’ agglomeration. Gauge factor (GF) rises and falls as GNP content increases from 0% to 1% with the optimal piezoresistivity observed at GNP = 0.1% and 0.05%. The GF values of the optimum mortar are over 50 times higher than those of the reference mortar. Fractal dimensions in macro and micro fractal regions change with GNP content. Analysis shows that the fractal dimensions in micro region decrease first and then increase with the increase of GF values. GNPs not only impact the fractal structure of cement mortar, but also alter the tunneling and contact effects that govern the piezoresistivity of composite materials.

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Effect of graphene oxide (GO) on the hydration and dissolution of alite in a synthetic cement system

Cited by 23 publications

References 35 publications

Ultrasound irradiation as an effective tool in synthesis of the slag-based catalysts for carboxymethylation

Ultrasound irradiation as an effective tool in synthesis of the slag-based catalysts for carboxymethylation

Efficient Use of Graphene Oxide and Silica Fume in Cement-Based Composites

May the Piezoresistivity of GNP-Modified Cement Mortar Be Related to Its Fractal Structure?

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