Service life evaluation of RC T-girder under carbonation considering cold joint and loading effects

Koh, Tae Ho; Kim, Moon Kyum; Yang, Keun Hyeok; Yoon, Yong Sik; Kwon, Seung Jun

doi:10.1016/j.conbuildmat.2019.07.106

Cited by 21 publications

(6 citation statements)

References 13 publications

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“…However, some researchers also reported a threshold for carbonation under sustained compressive load at a stress level of around 0.2–0.3 [ 50 , 51 , 52 , 53 ], which is similar to the results for permeability. Interestingly, the size of the specimens in their study was much smaller than the size in the previously described research (usually 100 × 100 × 400 mm 3 ).…”

Section: Carbonation Of Concrete Under Sustained Loadsupporting

confidence: 79%

“…Thus, the loading frames for environmental action other than carbonation are also included in the following discussion. For applying different types of loads including uniaxial compressive load [ 46 , 51 ], uniaxial tensile load [ 80 , 81 ], three-point bending load [ 72 ], and four-point bending load [ 79 , 82 ] by use of external bar tendons, several loading frames have been designed. Typical loading frames are shown in Figure 4 a–c.…”

Section: Test Methods For Carbonation Of Concrete Under Sustained Loadmentioning

confidence: 99%

“…Interestingly, the size of the specimens in their study was much smaller than the size in the previously described research (usually 100 × 100 × 400 mm 3 ). In the first two cases [ 50 , 51 ], the specimens were 100 mm high in the direction of compressive load. These sizes are similar to specimens used in permeability tests and are usually not large enough to provide a uniform distribution of compressive stress.…”

Section: Carbonation Of Concrete Under Sustained Loadmentioning

confidence: 99%

See 2 more Smart Citations

Effect of the Mechanical Load on the Carbonation of Concrete: A Review of the Underlying Mechanisms, Test Methods, and Results

2021

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As one of the major causes of concrete deterioration, the carbonation of concrete has been widely investigated over recent decades. In recent years, the effect of mechanical load on carbonation has started to attract more attention. The load-induced variations in crack pattern and pore structure have a significant influence on CO2 transport which determines the carbonation rate. With different types of load, the number, orientation, and position of the induced cracks can be different, which will lead to different carbonation patterns. In this review paper, the carbonation in cracked and stress-damaged concrete is discussed first. Then, literature about the effect of sustained load during carbonation is compared in terms of load type and load level. Finally, the advantages and disadvantages of possible test methods for investigating the effect of sustained load on carbonation are discussed with respect to loading devices, load compensation, and specimen size.

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Section: Carbonation Of Concrete Under Sustained Loadsupporting

confidence: 79%

Section: Test Methods For Carbonation Of Concrete Under Sustained Loadmentioning

confidence: 99%

Section: Carbonation Of Concrete Under Sustained Loadmentioning

confidence: 99%

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Effect of the Mechanical Load on the Carbonation of Concrete: A Review of the Underlying Mechanisms, Test Methods, and Results

2021

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“…Many studies have pointed out that construction joint may become the weakness of concrete durability. Therefore, the steel bars at the construction joints are relatively easier to contact with chloride ions, water vapor, oxygen and other substances that accelerate the corrosion of steel bars (Koh et al, 2019). Once the harmful substances reach the critical concentration, the steel bars will begin to rust at the construction joints, reducing the effective section areas of the steel bars and endangering the durability and safety of the structure.…”

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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“…Concrete carbonation is the primary factor that causes the reinforcing bar corrosion of RC structures exposed to an atmospheric environment. With the accelerating process of global industrialization, the concentration of carbon dioxide (CO 2 ) in the air is increasing, and the carbonation of RC structures is becoming increasingly serious [12,13]. Concrete carbonation refers to CO 2 ingression concrete interior and neutralization with alkaline substances.…”

Section: Introductionmentioning

confidence: 99%

Corrosion-Fatigue Life Prediction Modeling for RC Structures under Coupled Carbonation and Repeated Loading

Cui

Liu

et al. 2021

Mathematics

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The coupled action of concrete carbonation and repeated loading strongly influences the safety of reinforced concrete (RC) structures and substantially reduces service life. A novel corrosion-fatigue life prediction model for RC structures under coupled carbonation and repeated loading was developed. The effect of fatigue damage on concrete carbonation and carbonation-induced corrosion rate was considered, and the acceleration of fatigue damage accumulation due to reinforcement corrosion was considered in this approach. The proposed corrosion-fatigue life prediction model was illustrated by a 6 m-span RC slab in a simply supported slab bridge for the highway, and the effects of traffic frequency, overloading, carbonation environment grade, and environmental temperature and relative humidity on corrosion-fatigue life were discussed. The results indicate that the proposed model can predict the corrosion-fatigue life of RC structures simply and conveniently. Traffic frequency, overloading, carbonation environment grade, and environmental temperature and relative humidity can decrease the corrosion-fatigue life of the RC slab by up to 66.86%, 58.90%, 77.45%, and 44.95%, respectively. The research is expected to provide a framework for the corrosion-fatigue life prediction of RC structures under coupled carbonation and repeated loading.

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Service life evaluation of RC T-girder under carbonation considering cold joint and loading effects

Cited by 21 publications

References 13 publications

Effect of the Mechanical Load on the Carbonation of Concrete: A Review of the Underlying Mechanisms, Test Methods, and Results

Effect of the Mechanical Load on the Carbonation of Concrete: A Review of the Underlying Mechanisms, Test Methods, and Results

Comparative experiment of steel bar corrosion at concrete construction joints

Corrosion-Fatigue Life Prediction Modeling for RC Structures under Coupled Carbonation and Repeated Loading

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