Investigation on the Air Permeability and Pore Structure of Concrete Subjected to Carbonation under Compressive Stress

Zhang, Cheng; Shi, Xinyu; Wang, Ling; Yao, Yan

doi:10.3390/ma15144775

Cited by 8 publications

(2 citation statements)

References 63 publications

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“…For the relationship between fractal dimension and rutting depth, we only analyze the fractal results of section 2-A, and the results are shown in Figure 11 . The fractal dimension is related to the complexity and disorder of surface morphology, and more complex image surfaces have higher fractal dimensions [ 30 ]. In general, the fractal dimension of air voids increases with the increase in loading times.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Rutting Damage by the Change of Air-Void Characteristics in the Asphalt Mixture Based on Two-Dimensional Image Analysis

et al. 2022

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In the process of the rutting test, the air-void characteristics in asphalt mixture specimens are a dynamic change process. It is of great significance to systematically study the correlation between the change of air-void characteristics and the depth of the rutting slab and establish a relationship with damage. In this paper, the air-void information of rutting specimen sections with different loading cycles (500, 1000, 1500, 2000, 2500, and 3000 times) is obtained by two-dimensional image technology. The dynamic change process of the micro characteristics of internal air voids of two graded asphalt mixtures (AC-13 and AC-16) under cyclic wheel load is analyzed, and it is used as an index to characterize the microstructure damage of the asphalt mixture. The results show that the variation of air-void distribution, air-void shape characteristics, and air-void fractal dimension with the loading process can well characterize the permanent deformation law of the rutting slab. The fractal dimension of the air void increases with the increase in load. It is a dynamic process in which the air-void content changes with crack initiation and propagation. After rutting deformation, the total air-void area and average air-void size of the sample increase, and the total air-void number decreases. Because microcracks are formed in the specimen after rutting damage, the aspect ratio of the air void increases, and the roundness value decreases.

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Section: Resultsmentioning

confidence: 99%

Characterization of Rutting Damage by the Change of Air-Void Characteristics in the Asphalt Mixture Based on Two-Dimensional Image Analysis

et al. 2022

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“…Vivid observation of the cracking during carbonation is never an easy task. For traditional methods such as scanning electron microscopy (SEM) [ 46 ] or mercury intrusion porosimetry (MIP) [ 47 ], even though their precision level are sufficient for the observation of cracks, the pretreatment is indispensable. Since new cracks may generate along the pretreatment, the observation of the cracking is less trustable.…”

Section: Discussionmentioning

confidence: 99%

Investigation on the Carbonation Behavior of Alkali-Activated Pastes Served under Windy Environments

Cui

Shen²,

Shen³

et al. 2023

Materials

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Most reinforced concrete structures serve under windy environments, and the carbonation resistance under that circumstance exhibits significant difference from that under the steady (no wind) environment. In this study, a windy environment was simulated using one self-developed wind tunnel, and alkali-activated slag/fly ash paste specimens were adopted for the carbonation under variant windy environments. Meanwhile, to reveal the effect of inner humidity on the carbonation, sliced alkali-activated materials (AAM) were mass-balanced first to variant humidity, and were then carbonated under a 2.5 m/s windy environment. With the assistance of computed tomography (CT), the structure of AAM at variant carbonation ages was rendered. The experimental result showed that wind is capable of promoting the exchange of moisture between the sample inside and the outer atmosphere, leading to faster carbonation as compared to that under no wind environment. When preconditioned to lower inner humidity, the carbonation rate of AAM was faster because the larger gaseous space benefited the intrusion of both CO2 and moisture. Furthermore, when preconditioned to lower humidity, the cracking extent of AAM was severer, which also contributed to the faster carbonation. Moreover, compared with ordinary Portland cement (OPC), the carbonation front on each instant 1D gray-scale value profile was broader, which suggested that the carbonation progress of AAM under windy environments was no longer controlled solely by diffusion. In addition, the gray-scale value on instant 1D profile fluctuated drastically, which verified cracking in AAM carbonated under windy environments. The current work not only deepens the understanding of the carbonation mechanism in-site (mostly under windy environments), but also helps to develop more environment-friendly construction material, with better durability performance.

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Neutralization evolution of concrete under acid rain and carbonation erosion: a review

Guo

et al. 2023

Journal of Materials Research and Technology

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Investigation on the Air Permeability and Pore Structure of Concrete Subjected to Carbonation under Compressive Stress

Cited by 8 publications

References 63 publications

Characterization of Rutting Damage by the Change of Air-Void Characteristics in the Asphalt Mixture Based on Two-Dimensional Image Analysis

Characterization of Rutting Damage by the Change of Air-Void Characteristics in the Asphalt Mixture Based on Two-Dimensional Image Analysis

Investigation on the Carbonation Behavior of Alkali-Activated Pastes Served under Windy Environments

Neutralization evolution of concrete under acid rain and carbonation erosion: a review

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