Salt Freeze-Thaw Damage Characteristics of Concrete based on Computed Tomography

Chen, Shaojie; Ren, Jihong; Song, Yongjun; Li, Qiang; Sun, Jielong; Che, Yongxin; Chen, Jiaxing

doi:10.17559/tv-20190819080524

Cited by 4 publications

(3 citation statements)

References 27 publications

(28 reference statements)

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“…To confirm the proportion of coarse aggregate in a concrete structure, it is necessary to obtain an image of the internal structure of the concrete. Computed tomography (CT), as a non-destructive testing method, is widely used to explore the internal structure of concrete and its development [28][29][30][31]. It can clearly, accurately and intuitively display the internal structure, composition, material and defect status of the detected object in the form of two-dimensional tomographic images or three-dimensional images under the condition of no damage to the detected object [32][33][34], and it is known as the best nondestructive testing and non-destructive assessment technology today.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Corrosion Damage in Sulfate-Attacked Concrete by CT, Ultrasonic Pulse Velocity Testing and AHP Methods

Liu

Gong

Tang

et al. 2022

Sensors

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Coarse aggregate in concrete is basically free from sulfate corrosion. If the influence of the coarse aggregate in the concrete is not eliminated, the change amount of the concrete ultrasonic pulse velocity value is directly used to evaluate the damage degree of sulfate corrosion in the concrete, and the results are often inaccurate. This paper presents an evaluation method of corrosion damage for the sulfate-attacked concrete by CT, ultrasonic velocity testing and AHP methods. CT was used to extract the coarse aggregate information in the specimen, and the proportion of coarse aggregate on the ultrasonic test line was calculated based on CT image analysis. Then, the correction value of ultrasonic pulse velocity (UPV) of the concrete structure was calculated, and the sulfate corrosion degree of concrete structure was evaluated using the analytic hierarchy process (AHP). The results show that the evaluation method proposed in this paper could more accurately evaluate the corrosion damage in the sulfate-attacked concrete structures, and the evaluation results were more in line with reality.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Corrosion Damage in Sulfate-Attacked Concrete by CT, Ultrasonic Pulse Velocity Testing and AHP Methods

Liu

Gong

Tang

et al. 2022

Sensors

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“…Wang et al [20] showed that the presence of biomass ash does not appear to have a significant impact on the freezing and thawing behaviour with a proper amount of air entraining agent. Addition of chemical admixture for air entraining in concrete air can also increase freeze/thaw resistance with de-icing salt of concrete [22]. The effect of wood ash on the drying shrinkage of cement composites depends on the level of replacement of cement.…”

Section: Introductionmentioning

confidence: 99%

Properties of Self-compacting Concrete Produced with Biomass Wood Ash

et al. 2021

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The demand of the contemporary society for renewable energy sources lead to the increase of the bio-power plants. Accordingly, the amount of ash generated by burning the biomass is increased, and its disposal becomes a large environmental problem. The paper presents the research of potential use of biomass wood ash as a partial replacement for coal fly ash (10%, 20%, 30% and 40% of mass) in production of self-compacting concrete (SCC). The effects of biomass wood ash on the properties of SCC in fresh and hardened states have been examined, as well as on the properties of durability. Test results indicated that the biomass wood ash slightly reduces the flowability and passing ability of SCC, while its addition enhances the viscosity of SCC and significantly prevents segregation and bleeding. SCCs with the contents of biomass wood ash up to 20% have approximately same mechanical strength as the reference mixture. Biomass wood ash has no negative effect on the resistance of concrete to the action of water under pressure, but a decrease of freeze/thaw resistance with de-icing salt is detected as its contents increases. The addition of biomass wood ash into SCC increases the drying shrinkage in the initial period of drying (up to 14 days), and it is decreased in a later phase.

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“…Several studies on concrete damaged by salt freeze mainly focus on durability life predictions of concrete and mechanical performance and the influence of different mineral contents on concrete frost resistance [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ] to investigate the change in concrete properties after salt and frost damage. Some researchers have used CT scanning technology to show the micro-structure of the concrete [ 33 , 34 , 35 , 36 , 37 , 38 ]. They discussed the application prospect of CT scanning technology in the concrete pore and two-dimensional (2D) scanning section.…”

Section: Introductionmentioning

confidence: 99%

Study on Durability and Pore Characteristics of Concrete under Salt Freezing Environment

et al. 2021

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The macroscopic mechanical properties and frost resistance durability of concrete are closely related to the changes in the internal pore structure. In this study, the two-dimensional and three-dimensional ICT (Industrial Computerized Tomography) pore characteristics of C30 concrete specimens before and after freezing and thawing in clean water, 5 wt.% NaCl, 5 wt.% CaCl2, and 5 wt.% CH3COOK solution environments are obtained through concrete frost resistance durability test and ICT scanning technology. The effects of pore structure changes on concrete frost resistance, durability, and compressive strength mechanical properties after freezing and thawing cycles in different salt solution environments are analyzed. This paper provides new means and ideas for the study of concrete pores. The results show that with the increase in the freezing and thawing times, the concrete porosity, two-dimensional pore area, three-dimensional pore volume, and pore number generally increase in any solution environment, resulting in the loss of concrete compressive strength, mortar spalling, and the decrease in the relative dynamic elastic modulus. Among them, the CH3COOK solution has the least influence on the concrete pore changes; the NaCl solution has the greatest influence on the change in the concrete internal porosity. The damage of CaCl2 solution to concrete is second only to the NaCl solution, followed by clean water. The increase in the concrete internal porosity from high to low is NaCl, CaCl2, clean water, and CH3COOK. The change in the pore volume of 0.1 to 1 mm3 after the freeze–thaw cycle is the main factor for reducing concrete strength. The test results have certain guiding value for the selection of deicing salt in engineering.

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Salt Freeze-Thaw Damage Characteristics of Concrete based on Computed Tomography

Cited by 4 publications

References 27 publications

Evaluation of Corrosion Damage in Sulfate-Attacked Concrete by CT, Ultrasonic Pulse Velocity Testing and AHP Methods

Evaluation of Corrosion Damage in Sulfate-Attacked Concrete by CT, Ultrasonic Pulse Velocity Testing and AHP Methods

Properties of Self-compacting Concrete Produced with Biomass Wood Ash

Study on Durability and Pore Characteristics of Concrete under Salt Freezing Environment

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