Assessment of concrete damage and strength degradation caused by reinforcement corrosion

Nepal, Jaya; Chen, Hua-Peng

doi:10.1088/1742-6596/628/1/012050

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…Based on the results of a full-scale engineering survey, it was established: -The greatest damage (III-IV category of the technical condition assessment [14]) was found in reinforced concrete beams located at 7.00, i.e., in the overlap of the 1st floor: 33% for the beams B-4 and 10% for the beams B-18 (Fig. 2).…”

Section: Results Of Full-scale Engineering Survey Of Reinforced Concrete Beams Of Intermediate Floorsmentioning

confidence: 99%

Estimation of the industrial building reinforced concrete beams’ residual life under corrosive media influence

et al. 2021

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The dominant factor determining chemical industry objects’ durability is the corrosive wear of the stretched reinforcement and the compressed zone of concrete. The article presents a methodology and results of a numerical assessment of the residual life of the reinforced concrete frame beams of an industrial building operating in an aggressive environment. According to the full-scale engineering survey results, the most damaged frame structures - the beams of the intermediate floors were identified. The period of concrete protective layer complete neutralization, the degree of corrosion damage to the working reinforcement, the compressed concrete neutralized layer depth, the change in its strength characteristics with depth and the degree of its heterogeneity were determined by the field measurements using the standard and non-standard methods of non-destructive testing. A linear law of the accumulation of corrosion damage to concrete in the compressed zone and the rate of corrosion damage in the working reinforcement after the concrete protective properties’ exhaustion is adopted. A normative design apparatus is used for the first group of limiting states in relation to the most loaded section. For an adequate assessment and prediction of the residual resource, the main emphasis is on experimental and diagnostic methods.

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Section: Results Of Full-scale Engineering Survey Of Reinforced Concrete Beams Of Intermediate Floorsmentioning

confidence: 99%

Estimation of the industrial building reinforced concrete beams’ residual life under corrosive media influence

et al. 2021

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“…Such defects often occur as a result of non-compliance with the technology of concrete works such as lack of proper attention to concrete in hot or winter conditions, smaller than standard protective layers, early remove of formwork etc. Moreover, cracks on the structures of floors (roofs) appear in the process of non-compliance with the rules of operation of building or structure [1,2]. In particular, the influence of factors that occur during the operation of the building can provoke cracks on the surface of building structures.…”

Section: Problem Statementmentioning

confidence: 99%

The technology of crack repair by polymer composition

Tonkacheiev

Molodid²,

Galinskyi³

et al. 2022

OMTC

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Introduction. During the inspection of buildings and structures and development of design documentation for restoration works it was found that there is a need to provide recommendations or to develop solutions for repair work. These repair works either are not regulated by standards or may be technically or economically inefficient. Problem Statement. The most common defect of the tension zone in reinforced concrete beams, floor slabs or roof slabs are cracks. Injection technology is normally used to repair it. However, in case of large number of small cracks, this technology is time consuming. Purpose. Development of a new technology for repairing the tension zone of reinforced concrete beams, floor slabs or roof slabs with a large number of small cracks. This will ensure maximum filling of cracks with polymer compositions with their subsequent bonding. Materials and methods. A number of factors that may affect the technology of filling cracks with polymer compositions have been identified from the analysis of scientific and technical literature. A special device ‘tray’ was produced for experimental research. It was attached to the lower zone by a system of ties or props. A repair mix to fill the cracks was fed into the tray under pressure. By means of changing the experiment conditions the strengthening level of previously destroyed samples were set. Results. As a result, it was found that the maximum filling of cracks with the polymer composition is achieved within the 5-10 minutes of repair mix supply at a pressure in the system in the range of 0.5-0.6 atmospheres (atm). The maximum strengthening of the repaired structures under the re-applied destructive force was achieved at the conditions of repair work with a structural temperature of 20 ± 2 оС and dry state of the structure. Conclusions. The technology of repair with polymer compositions of the cracks located on the lower surface of horizontal reinforced concrete structures has been developed. It was established that in the presence of small cracks on the structure (the width is up to 0.2 mm) the developed technology is most effective, in case of widths from 0.3 to 0.8 mm it is advisable to use injection technology whereas for widths larger than 0.8 mm the hybrid technology should be applied.

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“…Xi et al [7] studied the overall structural change of concrete coating by numerical simulation, analyzed the influence of thickness of coating and spacing of reinforcement on crack width, and pointed out that the prediction of concrete crack was beneficial to prolong the service life of the structure. To study the influence of steel corrosion on structural deterioration, Nepal et al [8] designed a method of calculating structural life reliability by deterioration model and found by experiments that the method could correctly evaluate the damage caused by steel corrosion and predict structural reliability. Lee et al [9] proposed an arc thermal spraying method to protect the reinforced concrete structure and prevent the penetration of acidic solution and found through experiments that the technology exhibited high impedance values in three acidic PH solutions.…”

Section: Introductionmentioning

confidence: 99%

Archives of Civil Engineering

Gao

2020

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Chloride ion erosion in offshore environment may damage the mechanical properties of beam bridges. In this study, the reinforced concrete specimen was designed, accelerated erosion experiments were carried out to simulate the coastal corrosion environment, and the corrosion rate, nominal strength and equivalent strength of steel bars, concrete cracks and reliability of beam bridges were calculated to understand the time-varying mechanical properties of beam bridges. The results showed that the nominal and equivalent strength of reinforcing bars decreased with the increase of corrosion rate of reinforcing bars. The change of yield strength was greater than that of equivalent strength. The change of crack width of concrete showed a slow-fast-slow trend, and the reliability of beam bridges decreased significantly in about 50 years. The experimental results show that chloride ion corrosion can significantly damage the mechanical properties of the beam bridge and affect the time-varying reliability of the beam bridge. Therefore, it is necessary to carry out timely maintenance and inspection and take effective methods to control steel corrosion to ensure the safety of the use of the beam bridge.

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Assessment of concrete damage and strength degradation caused by reinforcement corrosion

Cited by 9 publications

References 15 publications

Estimation of the industrial building reinforced concrete beams’ residual life under corrosive media influence

Estimation of the industrial building reinforced concrete beams’ residual life under corrosive media influence

The technology of crack repair by polymer composition

Archives of Civil Engineering

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