Resistance of Segmental Joints to Chloride Ions

Li, Guoping; Hu, Hao; Ren, Cai

doi:10.14359/51688931

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…The results show that, except for epoxy-coated steel bars, the most severely corroded parts of the tested steel bars in concrete samples are at the nodes, and the corrosion at non-nodes is relatively uniform and less, especially in the alternating dry and wet environment, even in stainless steel bars. Li [14] et al investigated the effect of segmental joint type and load conditions on the resistance to chloride ions of segmental joints by performing salt solution immersion tests on samples of direct wet joints, rough wet joints, and epoxy joints. According to the chloride ion content at different depths after immersion, the following conclusions were drawn: For samples with a certain compressive strain level or no strain, the monolithic concrete exhibited the best chloride ion resistance, which was superior to direct wet joints and rough wet joints.…”

Section: Research On New and Old Concrete Jointsmentioning

confidence: 99%

A Review of Durability of New and Old Concrete Joints

Long

2024

SJT

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The purpose of this study is to explore the durability of the new and old concrete joints, including chloride ion erosion, freeze-thaw phenomena, and the influence of aggregates. Firstly, taking into account the difference in material properties between the old and new concrete, this study analyzes the chloride ion transport characteristics of the joints in detail, focusing on the key areas of the joints, that is, the areas where the old concrete may have been eroded by chloride ions. Secondly, this study explores the change in the properties of the joints under freeze-thaw conditions, and the influence of different interface treatment methods on the properties of the joints. Finally, this study examines the influence of the type and content of aggregates on the durability of the joints. Through the above research, this paper aims to provide some useful guidance and suggestions for the durability design of the old and new concrete structures.

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Section: Research On New and Old Concrete Jointsmentioning

confidence: 99%

A Review of Durability of New and Old Concrete Joints

Long

2024

SJT

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“…Studies have shown that chloride erosion is more severe at concrete joints, which deserves attention. Li et al [20] studied the effect of joint type and load conditions on the resistance of segmental joints to chloride ions through salt solution immersion tests. Liu et al [21] investigated the effect of reinforcement corrosion on the shear strength of the new-to-old concrete interface based on accelerated corrosion tests.…”

Section: Introductionmentioning

confidence: 99%

Concrete Cover Cracking and Reinforcement Corrosion Behavior in Concrete with New-to-Old Concrete Interfaces

Zhang,

Li,

Zhao

et al. 2023

Materials

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In reinforced concrete (RC) structures, new-to-old concrete interfaces are widely present due to precast splices, repairs, and construction joints. In this paper, both monolithic and segmental specimens were fabricated with five kinds of water–cement ratios, including ordinary and high-strength concrete. The impressed current-accelerated corrosion test was used, and the degree of reinforcement corrosion was controlled by Faraday’s Law. In the accelerated corrosion process, the concrete surface cracking, steel corrosion, and mechanical properties of the corroded steels in the segmental specimens were investigated and compared with monolithic specimens considering the pouring method, concrete strength, and the strength difference between new and old concrete. The prediction of concrete cracking time was also discussed. The results indicated that, for the monolithic specimens, longitudinal cracks could be observed on the ordinary concrete surface, while no cracks were produced on a high-strength concrete surface; only the rust leaked out at the ends. For the segmental specimens, both longitudinal and transverse cracks were produced on an ordinary concrete surface, while only transverse cracks were produced at the high-strength new-to-old concrete interfaces. The steel embedded in the segmental specimens suffered more sectional loss at the new-to-old concrete interfaces. An influence coefficient based on the section loss of the rebar was proposed to evaluate the influence of interfaces on the rust uniformity of rebars. When there were differences in strength between new and old concrete, the influence of the interface on the uniformity of steel bar cross-section loss slightly increased. Based on available theoretical analysis for uniform corrosion, the concrete cracking time of the monolithic specimens was predicted, which was basically consistent with experimental phenomena. However, further research is needed to predict the service life of segmental specimens with new-to-old concrete interfaces.

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“…Mun and Kwon (2016) presented an evaluation of cold joint and loading conditions on chloride diffusion behavior, and the study showed that chloride diffusion coefficient under 30% level of compressive stress significantly increases by 1.7 times compared with normal condition. Li et al (2016) conducted a salt solution immersion test on six specimens with direct wet joints, roughened wet joints and epoxied joints and conclude that monolithic concrete had optimal resistance to chloride ions, better than the direct wet joints and roughened wet joints. Shen et al (2019) conducted a freeze-thaw cycle test in the laboratory and found that construction joints increased the mass loss of specimens.…”

Section: Introductionmentioning

confidence: 99%

Comparative experiment of steel bar corrosion at concrete construction joints

Huang¹,

Wu²,

Shen

et al. 2022

Front. Mater.

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Introduction: Construction joint is common and even inevitable in most of the reinforcement concrete structures. This study was to assess the effect of construction joints on chloride-induced corrosion of reinforcing steel in concrete.Methods: Test parameters included two environmental conditions (salt solution immersion condition and cyclic wet-dry condition), two forms of construction joint (direct wet joint and roughened wet joint) and four types of steel bar (mild steel bar, ferritic stainless-steel bar, austenitic-ferritic stainless-steel bar and epoxy-coated steel bar). The corrosion test of 90 specimens was carried out by electrochemical accelerated corrosion method. The weight loss of each steel bar and steel bar section in specimens was measured. An influence coefficient (k_j) of construction joint on local weigh loss of steel bars was defined.Results: Except for epoxy-coated steel bars, the most severe corrosion of experimental steel bars in concrete specimens all occurred at the joints, while the corrosion in non-joint sections of steel bars was relatively uniform and less. The weight loss rate of specimens has the range of 1.18% to 15.73% with an average value of 6.22%. The average k_j of mild steel bars, S11203 stainless steel bars, and S23043 stainless steel bars are 1.38, 1.92, and 1.97, respectively. The average k_j of specimens in immersion condition and cyclic wet-dry condition are 1.44 and 2.07. The corrosion of epoxy-coated steel bars mainly occurred at the damage locations of epoxy coating, not mainly at the joints.Conclusion: Chloride-induced corrosion of steel bars at construction joints was always more severe than at non-joints, especially in cyclic wet-dry environments, even for stainless-steel bar, but epoxy-coated steel bars were excluded.

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Resistance of Segmental Joints to Chloride Ions

Cited by 3 publications

References 26 publications

A Review of Durability of New and Old Concrete Joints

A Review of Durability of New and Old Concrete Joints

Concrete Cover Cracking and Reinforcement Corrosion Behavior in Concrete with New-to-Old Concrete Interfaces

Comparative experiment of steel bar corrosion at concrete construction joints

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