Influence of Graphite Powder on the Mechanical and Acoustic Emission Characteristics of Concrete

He, Wei; Hao, Wenru; Meng, Xia; Zhang, Pengchong; Sun, Xu; Shen, Yongjun

doi:10.3390/buildings12010018

Cited by 13 publications

(6 citation statements)

References 32 publications

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“…The relationship between D s and the porosity can be seen in Figure 5a. Many researchers confirmed that the fine pores less than 50 nm dominantly affect the shrinkage behavior of concrete [36,61,[99][100][101][102][103][104]. The V 2.5-50 nm values estimated from Table 4 are shown in Table 7.…”

Section: Fractal Dimension Of Pore Surface (D S )mentioning

confidence: 85%

Influence of MgO on the Hydration and Shrinkage Behavior of Low Heat Portland Cement-Based Materials via Pore Structural and Fractal Analysis

Wang

Liu

et al. 2022

Fractal Fract

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Currently, low heat Portland (LHP) cement is widely used in mass concrete structures. The magnesia expansion agent (MgO) can be adopted to reduce the shrinkage of conventional Portland cement-based materials, but very few studies can be found that investigate the influence of MgO on the properties of LHP cement-based materials. In this study, the influences of two types of MgO on the hydration, as well as the shrinkage behavior of LHP cement-based materials, were studied via pore structural and fractal analysis. The results indicate: (1) The addition of reactive MgO (with a reactivity of 50 s and shortened as M50 thereafter) not only extends the induction stage of LHP cement by about 1–2 h, but also slightly increases the hydration heat. In contrast, the addition of weak reactive MgO (with a reactivity of 300 s and shortened as M300 thereafter) could not prolong the induction stage of LHP cement. (2) The addition of 4 wt.%–8 wt.% MgO (by weight of binder) lowers the mechanical property of LHP concrete. Higher dosages of MgO and stronger reactivity lead to a larger reduction in mechanical properties at all of the hydration times studied. M300 favors the strength improvement of LHP concrete at later ages. (3) M50 effectively compensates the shrinkage of LHP concrete at a much earlier time than M300, whereas M300 compensates the long-term shrinkage more effectively than M50. Thus, M300 with an optimal dosage of 8 wt.% is suggested to be applied in mass LHP concrete structures. (4) The addition of M50 obviously refines the pore structures of LHP concrete at 7 days, whereas M300 starts to refine the pore structure at around 60 days. At 360 days, the concretes containing M300 exhibits much finer pore structures than those containing M50. (5) Fractal dimension is closely correlated with the pore structure of LHP concrete. Both pore structure and fractal dimension exhibit weak (or no) correlations with shrinkage of LHP concrete.

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Section: Fractal Dimension Of Pore Surface (D S )mentioning

confidence: 85%

Influence of MgO on the Hydration and Shrinkage Behavior of Low Heat Portland Cement-Based Materials via Pore Structural and Fractal Analysis

Wang

Liu

et al. 2022

Fractal Fract

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“…A viable solution to improve the mixture properties for a better damage resistance is to add steel or carbon fibers or conductive fillers. [ 38 ] Next, we demonstrate how a conductive filler, i.e., graphite powder, can significantly reduce the initial concrete cracking while enabling a nanogenerator‐integrated concrete system.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Nanogenerator‐Integrated Metamaterial Concrete Systems for Smart Civil Infrastructure

et al. 2023

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Creating multifunctional concrete materials with advanced functionalities and mechanical tunability is a critical step toward reimagining the traditional civil infrastructure systems. Here, the concept of nanogenerator‐integrated mechanical metamaterial concrete is presented to design lightweight and mechanically tunable concrete systems with energy harvesting and sensing functionalities. The proposed metamaterial concrete systems are created via integrating the mechanical metamaterial and nano‐energy‐harvesting paradigms. These advanced materials are composed of reinforcement auxetic polymer lattices with snap‐through buckling behavior fully embedded inside a conductive cement matrix. We rationally design their composite structures to induce contact‐electrification between the layers under mechanical excitations/triggering. The conductive cement enhanced with graphite powder serves as the electrode in the proposed systems, while providing the desired mechanical performance. Experimental studies are conducted to investigate the mechanical and electrical properties of the designed prototypes. The metamaterial concrete systems are tuned to achieve up to 15% compressibility under cycling loading. The power output of the nanogenerator‐integrated metamaterial concrete prototypes reaches 330 µW. Furthermore, the self‐powered sensing functionality of the nanogenerator concrete systems for distributed health monitoring of large‐scale concrete structures is demonstrated. The metamaterial concrete paradigm can possibly enable the design of smart civil infrastructure systems with a broad range of advanced functionalities.

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“…Besides, with the increase of the replacement ratio of BGF, the compressive strength decreased while the compressive strength of the specimen with SGF did not change. This is because the flake shape is also weak in compression [ 45 ]. The BGF led to lower compressive strength due to the larger flake shape.…”

Section: Resultsmentioning

confidence: 99%

Effect of Types of Microparticles on Vibration Reducibility of Cementitious Composites

Park

Pyo

2022

Materials

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The vibration-reducing ability of construction materials is generally described by the damping ratio of the materials. Previously, many studies on the damping ratio of concrete have been done, such as the addition of rubber, polymer, fiber, and recycled aggregates in the concrete. However, the application of these materials in construction is limited due to their drawbacks. This paper investigated the effect of the replacement ratio and the size of the hollow glass microspheres (HGM), cenospheres (CS), and graphite flakes (GF) on the damping ratio of mortar. Furthermore, rubber particles (RP), aluminum powder (AP), and natural fiber (NF) were investigated to find if they have a combination effect with HGM. The half-power bandwidth method was conducted to obtain the damping ratio at 28 days of curing, and the compressive and flexural strength tests were also conducted to study the mechanical properties of mortar that contained HGM, CS, and GF. The results show that increases in the size of HGM and the replacement ratio of sand with HGM lead to an increase in the damping ratio. Moreover, RP and NF do not provide a combination effect with HGM on the damping ratio, whereas the application of AP results in a drastic compressive strength decrease even with an increase in damping ratio when incorporated with HGM. Besides, an increase in the replacement percentage of CS also leads to an improvement in the damping ratio, and a smaller size and higher replacement ratio of GFs can improve the damping ratio compared to other additives. As a result, CS and GF are more effective than HGM. 50% replacement ratio of CS slightly reduced the compressive strength by 6.4 MPa while improving the damping ratio by 15%, and 10% replacement ratio of samller GF can enhance the flexural strength by over 4.55% while increasing the damping ratio by 20.83%.

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Influence of Graphite Powder on the Mechanical and Acoustic Emission Characteristics of Concrete

Cited by 13 publications

References 32 publications

Influence of MgO on the Hydration and Shrinkage Behavior of Low Heat Portland Cement-Based Materials via Pore Structural and Fractal Analysis

Influence of MgO on the Hydration and Shrinkage Behavior of Low Heat Portland Cement-Based Materials via Pore Structural and Fractal Analysis

Multifunctional Nanogenerator‐Integrated Metamaterial Concrete Systems for Smart Civil Infrastructure

Effect of Types of Microparticles on Vibration Reducibility of Cementitious Composites

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