Ultrasonic and X-CT measurement methods for concrete deterioration of segmental lining under wetting-drying cycles and sulfate attack

Liu, Dunwen; Cao, Kunpeng; Tao, Yu; Zhong, Aijun; Jian, Yinghua; Gong, Chun; Meng, Xianqing

doi:10.1016/j.measurement.2022.111983

Cited by 13 publications

(3 citation statements)

References 35 publications

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“…Different from mortar samples, the real damage state of the concrete samples in the process of sulfate attack will show strong non-uniformity because the performance of the aggregate in concrete will not be affected. Eliminating aggregate interference to obtain more accurately the ultrasonic velocity of mortar [ 32 ] or calculating the ultrasonic velocity of concrete by layers according to the erosion process [ 33 ] can improve the accuracy of evaluating the damage degree of concrete. However, for the real engineering structure, in addition to the overall strength decline, the uneven force caused by the difference in damage degree is also an important reason for the failure of the structure.…”

Section: Discussionmentioning

confidence: 99%

Compartmentalized Quantitative Analysis of Concrete Sulfate-Damaged Area Based on Ultrasonic Velocity

et al. 2023

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The corrosion of concrete in sulfate environments is a difficult problem in the durability of civil engineering structures. To investigate the variability of deterioration damage to concrete structures by sulfate erosion under non-destructive testing and quantify the protective effect of silane coatings on concrete under the action of sulfate erosion, an accelerated erosion experiment was carried out using field sampling in a tunnel project under a sulfate erosion environment. By means of ultrasonic velocity measurement and CT scanning, the samples protected by a silane coating under the sulfate attack environment were compared with those not protected. The deterioration characteristics of concrete under the sulfate attack environment and the protective effect of silane coating on the concrete structure were analyzed. In addition, a method for evaluating the sulfate damage to concrete based on CT images and ultrasonic velocity analysis was proposed. The results show that the samples prepared in the field show a significant difference in ultrasonic velocity in the process of erosion and deterioration according to the material difference at the measuring point interface. Through the overall damage evaluation analysis of the sample, it is concluded that the damage degree of the protected group sample is light and the heterogeneity is weak, whereas the local damage to the exposed group is serious. Combined with the CT image analysis of concrete before and after loading, the distribution characteristics of the damaged area divided by the concrete sulfate damage evaluation method proposed in this paper are highly similar to the real situation. The results of the study can provide a reference for similar projects for the detection, analysis, protection and evaluation of sulfate-attacked concrete.

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Section: Discussionmentioning

confidence: 99%

Compartmentalized Quantitative Analysis of Concrete Sulfate-Damaged Area Based on Ultrasonic Velocity

et al. 2023

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“…However, none of these methods can completely prevent cracking from occurring in concrete. Once concrete is cracked, without a proper repair treatment, it could lead to the seepage of moisture or harmful substances into the concrete, subsequently triggering the deterioration process of the structures [ [8] , [9] , [10] , [11] , [12] ].…”

Section: Introductionmentioning

confidence: 99%

Use of buffer treatment to utilize local non-alkali tolerant bacteria in microbial induced calcium carbonate sedimentation in concrete crack repair

Pianfuengfoo,

Kongtunjanphuk,

Zhang

et al. 2024

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“…Usual ESA testing methods involve the immersion of cement paste, mortar or concrete samples into a sulfate solution leading to the diffusion of sulfate ions through the samples. After several months to more than one year of immersion, such tests can be used to assess the change in the lengths and masses of samples induced by ESA in parallel through visual inspection [ 12 , 22 , 23 , 24 , 25 , 26 ]. However, several issues related to acceleration methods have been noted.…”

Section: Introductionmentioning

confidence: 99%

A Critical Review of Existing Test-Methods for External Sulfate Attack

et al. 2022

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External sulfate attack (ESA) of cementitious materials has been studied worldwide for a very long time. This physical/chemical interaction between sulfate ions and the cement hardened elements affects the long-term durability of concrete structures: cracking, spalling or strength loss of concrete structures. To study these damaging phenomena, some standardized and non-standardized accelerated aging tests are used to evaluate the performance of cements in sulfate-rich environments. However, these existing methods do not adequately predict field performance and some shortcomings or deficiencies still exist: change of degradation mechanisms when using high concentrations of sulfate, variable boundary conditions and small specimens compared to the real concrete structures. In this work, a critical review of some existing test methods and foreign national standard methods for ESA are presented, analyzed, and discussed. This results in some proposed recommendations for improving these methods to meet the needs of structure managers.

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Ultrasonic and X-CT measurement methods for concrete deterioration of segmental lining under wetting-drying cycles and sulfate attack

Cited by 13 publications

References 35 publications

Compartmentalized Quantitative Analysis of Concrete Sulfate-Damaged Area Based on Ultrasonic Velocity

Compartmentalized Quantitative Analysis of Concrete Sulfate-Damaged Area Based on Ultrasonic Velocity

Use of buffer treatment to utilize local non-alkali tolerant bacteria in microbial induced calcium carbonate sedimentation in concrete crack repair

A Critical Review of Existing Test-Methods for External Sulfate Attack

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