Fractal Cracking Patterns in Concretes Exposed to Sulfate Attack

Chen, Jiankang; Lu, Chunsheng

doi:10.3390/ma12142338

Cited by 11 publications

(5 citation statements)

References 47 publications

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“…At the initial stage of corrosion, part of the sulfate radicals enters the concrete to form expansive products such as gypsum and ettringite, which fills the crevices of the concrete, increases the density, improves the crack resistance and limits cracking performance of concrete, and therefore increases the fracture toughness [26,27]. With the increase of corrosion age, the volume of crystallization products expands and exceeds the bearing capacity of the pores, resulting in a large number of micro-cracks, and these micro-cracks form new channels, which accelerate the corrosion rate of sulfate [28]. Thus, the crack resistance performance and the fracture toughness are reduced.…”

Section: Fracture Toughness Of Modified Concretementioning

confidence: 99%

Determining the Mineral Admixture and Fiber on Mechanics and Fracture Properties of Concrete under Sulfate Attack

Guo

Wang

Qi³

2021

JMSE

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The concrete structure in the coastal area suffers from the combined erosion of sulfate and dry–wet cycles. In this study, in order to modify ordinary concrete, fly ash, slag powder, silica fume and polyester fiber are added separately. The crack resistance of concrete was studied through mechanical performance test and three-point bending fracture test of notched beam under sulfate dry–wet cycles. The load-crack opening displacement (P-CMOD) curve characteristics, fracture toughness and fracture energy of modified concrete after corrosion are calculated and analyzed. Results reveal that the P-CMOD curve of modified concrete after corrosion has gone through four stages of damage: initial bending section, proportional elastic section, stable expansion section and softening section. With the increase of dry–wet cycles, the overall corrosion resistance and toughening coefficient of modified concrete increases first and then decreases. Adding 25% fly ash can significantly enhance the fracture toughness of concrete in the initial stage. The addition of polyester fiber and slag is beneficial to the improvement of the instability toughness and fracture energy of the concrete in the later stage.

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Section: Fracture Toughness Of Modified Concretementioning

confidence: 99%

Determining the Mineral Admixture and Fiber on Mechanics and Fracture Properties of Concrete under Sulfate Attack

Guo

Wang

Qi³

2021

JMSE

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“…Similar to the other diseases such as rebar corrosion and ASR, the sulfate attack can also result in concrete cracking. A typical characteristic of the concrete cracking caused by the sulfate attack is that the crack is initiated near the periphery of the concrete component and gradually propagates toward the central zone, 18,19 as shown in Figure 7.…”

Section: A Review Of Common Damages Of Concrete In Chinamentioning

confidence: 99%

“…A typical characteristic of the concrete cracking caused by the sulfate attack is that the crack is initiated near the periphery of the concrete component and gradually propagates toward the central zone, 18,19 as shown in Figure 7.…”

Section: Sulfate Attackmentioning

confidence: 99%

Engineering practices on surface damage inspection and performance evaluation of concrete bridges in China

Chen

Fang

Pan

et al. 2021

Structural Concrete

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· This paper mainly demonstrates some experiences in China regarding surface damage inspection and performance evaluation of reinforced concrete (RC) bridges. To begin with, the mechanisms of the major damages of RC bridges such as chloride attack, concrete carbonation, and rebar corrosion are briefly reviewed. A statistical result of concrete cracking that exists in (prestressed) concrete bridges is presented as well. Second, the inspection practices of surface damages such as crack by using computer vision and deep learning on the RC pylons of the Jiang‐Yin Yangtze River bridge are demonstrated. Third, the specifications used in China for the performance evaluation of RC bridges are introduced. Its general philosophy and framework are explained. The Xia‐Men bridge is taken as an example to illustrate how to conduct a quantitative performance evaluation by following the instructions in China specifications. Finally, some perspectives on more advanced and efficient inspection techniques and performance evaluation methods are provided.

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“…Unfortunately, in some cases it is difficult to define the boundary of corrosion pits; this is regarded as a drawback of the method. On the other hand, the surface fractal dimension (D B ) can be used to evaluate the damage of the material, as reported previously [29][30][31][32][33][34]. To specify the fractal dimension of objects in registered SEM images, the differential box-counting method was applied.…”

Section: Surface Analysismentioning

confidence: 99%

Water-Induced Corrosion Damage of Carbon Steel in Sulfolane

et al. 2020

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Sulfolane in contact with water and oxygen forms acidic (by-) products that are major factors in accelerating the corrosion of carbon/stainless steel. In consequence, water-induced corrosion damage can be a serious problem in industrial systems. Hence, the determination of the corrosion resistance of AISI 1010 steel immersed in sulfolane containing 0 to 6 vol.% water was the principal objective of the study. Evaluation of the corrosion resistance of steel electrodes was performed using a potentiodynamic technique and scanning Kelvin probe microscopy. It was observed that the corrosion products layer that formed on the surface of AISI 1010 steel partially protects it against corrosion in sulfolane with a water concentration in the range from 1 vol.% to 4 vol.%. Interestingly, amounts of water above 4 vol.% cause a break-down of the corrosion products layer and deteriorate the corrosion resistance of AISI 1010 steel as well. Moreover, the relationship between the fractal dimension, corrosion degree of the steel surface and water concentration in sulfolane was investigated. The fractal dimension was determined using 2D grayscale images of AISI 1010 steel registered through a scanning electron microscope. It was noticed that both the fractal dimension and the corrosion degree rose with the increased water concentration in sulfolane.

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Fractal Cracking Patterns in Concretes Exposed to Sulfate Attack

Cited by 11 publications

References 47 publications

Determining the Mineral Admixture and Fiber on Mechanics and Fracture Properties of Concrete under Sulfate Attack

Determining the Mineral Admixture and Fiber on Mechanics and Fracture Properties of Concrete under Sulfate Attack

Engineering practices on surface damage inspection and performance evaluation of concrete bridges in China

Water-Induced Corrosion Damage of Carbon Steel in Sulfolane

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