A comparative study on shrinkage characteristics of graphene oxide (GO) and graphene nanoplatelets (GNPs) modified alkali-activated slag cement composites

Zhu, Xiaohong; Kang, Xiaojuan; Deng, Jiaxin; Yang, Kai; Yu, Linwen; Chen, Yang

doi:10.1617/s11527-021-01695-w

Cited by 26 publications

(4 citation statements)

References 46 publications

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“…However, some scholars have found that the relationship between the flexural strength of HFRNC and λ H is more consistent with the quadratic function. [61,66] In this paper, the quadratic function relationship is considered to establish the strength prediction model of GPC in the case of both single fiber and hybrid fiber, as shown in Formula (11). When fiber content exceeds a certain value, defects may occur due to the reduction in fiber spacing, resulting in the deterioration of matrix properties.…”

Section: Establishment Of Bending-strength Prediction Modelmentioning

confidence: 99%

“…[5] However, with in-depth study of GPC in recent years, researchers have gradually found that GPC has similar problems to ordinary concrete, such as high brittleness, low flexural strength, poor toughness, and poor crack resistance, and so on. [9][10][11][12] Such shortcomings will lead to local cracking in practical engineering applications, which will result in the premature corrosion of reinforcement in structural members, reducing the bearing capacity and durability of structures or members. [13,14] This can also explain why the current research on GPC mostly stays at the material level and is difficult to be put into engineering application.…”

Section: Introductionmentioning

confidence: 99%

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Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Zhao

Wang

et al. 2022

Structural Concrete

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In order to study the effect of different types of fibers on the bending properties of geopolymer concrete (GPC), a series of fiber‐reinforced geopolymer concrete (FRGPC) samples were prepared, and their flexural properties were evaluated by four point bending test and bending toughness evaluation index. Then, based on the fiber characteristic value (λ), a new bending strength prediction model and a three‐dimensional (3D) curved surface prediction model of the bending toughness of FRGPC are proposed and fitted. Finally, a new method for the selection of fibers in GPC is designed by calculating the derivative of the quadratic relationship between fiber reinforcement factor (S) and λ. The results show that all types of fibers have a certain effect on improving the bending strength of GPC samples, and the lifting rate is end‐hook steel fiber (SF), basalt fiber (BF), and short polyethylene polypropylene fiber (SPPF), from high to low. Mixing the above types of fibers with long polypropylene fibers (LPPF) will produce better performance. Among them, the hybrid fiber‐containing SF has the best performance. The bending performance prediction model deduced in this paper has a good correlation coefficient, which can be used to predict the bending performance of FRGPC. By making dS/dλ = 0 can calculate the optimal λ, and this λ can maximize the parameter S and guide the selection of optical fibers.

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Section: Establishment Of Bending-strength Prediction Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Zhao

Wang

et al. 2022

Structural Concrete

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“…It also has a low permeability. Zhu et al [59,60] studied the effects of GO and GNP on the performances of slag PPC composites and evidenced that the fillers accelerated the hydration degree. Chintalapudi et al [32] dispersed GO in fly ash PPC and found dense hydrated crystals formed by GO, which improved the compressive strength of the CCMs.…”

Section: Cement Matrixmentioning

confidence: 99%

Electrical, Piezoresistive and Electromagnetic Properties of Graphene Reinforced Cement Composites: A Review

Yue

Wang

et al. 2021

Nanomaterials

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Due to their excellent combination of mechanical and physical properties, graphene and its derivatives as reinforcements have been drawing tremendous attention to the development of high-performance and multifunctional cement-based composites. This paper is mainly focused on reviewing existing studies on the three material properties (electrical, piezoresistive and electromagnetic) correlated to the multifunction of graphene reinforced cement composite materials (GRCCMs). Graphene fillers have demonstrated better reinforcing effects on the three material properties involved when compared to the other fillers, such as carbon fiber (CF), carbon nanotube (CNT) and glass fiber (GF). This can be attributed to the large specific surface area of graphene fillers, leading to improved hydration process, microstructures and interactions between the fillers and the cement matrix in the composites. Therefore, studies on using some widely adopted methods/techniques to characterize and investigate the hydration and microstructures of GRCCMs are reviewed and discussed. Since the types of graphene fillers and cement matrices and the preparation methods affect the filler dispersion and material properties, studies on these aspects are also briefly summarized and discussed. Based on the review, some challenges and research gaps for future research are identified. This review is envisaged to provide a comprehensive literature review and more insightful perspectives for research on developing multifunctional GRCCMs.

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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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A comparative study on shrinkage characteristics of graphene oxide (GO) and graphene nanoplatelets (GNPs) modified alkali-activated slag cement composites

Cited by 26 publications

References 46 publications

Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Electrical, Piezoresistive and Electromagnetic Properties of Graphene Reinforced Cement Composites: A Review

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

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