Ultimate Flexural Capacity of Reinforced Concrete Elements Damaged by Corrosion

Bossio, Antonio; Imperatore, Stefania; Kioumarsi, Mahdi

doi:10.3390/buildings9070160

Cited by 20 publications

(13 citation statements)

References 46 publications

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“…Post-1980 scientific reports and technical documents [26][27][28] give a great emphasis to the reduced service life of RC structures in relation to bar corrosion and carbonation. In several papers, carbonation is regarded among the primary detrimental factors responsible for the corrosion of bars and the reduction of the service life of concrete structures [29][30][31][32], while many others investigated the reduction of the strength capacity of RC structures due to corrosion (see, e.g., [33][34][35][36]).…”

Section: Some Divergencies Between Past and Present On Rc Durabilitymentioning

confidence: 99%

Diagnostic Reliability in the Assessment of Degradation in Precast Concrete Elements

et al. 2021

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In the past century, precast reinforced concrete has become the most widely used construction material in infrastructure engineering, especially for long-span structures. Nowadays, a growing research area concerns the assessment of concrete strength degradation due to environmental exposure and reinforcement corrosion. This paper reports an experimental campaign on some prefabricated concrete elements that were exposed to atmospheric agents for approximately 20 years. The campaign took the uncommon opportunity to access the full inspection and sampling of rebar. The included activities had different invasiveness and encompassed inspections, core sampling, corrosion potential mapping, compressive strength tests, as well as neutralization depth assays on cored surfaces, on chisel-split surfaces, and on drilling powders. The results bring together a global diagnostic picture of very limited degradation and of elements that are fully able to attend their design service life; the latter is estimated to be considerably higher than 20 years and to exceed 75 years if the concrete mix does not show quality issues. Results also permit drawing considerations on a hierarchy of diagnostic reliability in the evaluation of RC degradation, in which concrete core sampling plays the role of golden standard.

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Section: Some Divergencies Between Past and Present On Rc Durabilitymentioning

confidence: 99%

Diagnostic Reliability in the Assessment of Degradation in Precast Concrete Elements

et al. 2021

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“…The corners were rounded to 10 mm for square and rectangular columns. The expression is given in Table 9; the lateral confining pressure is derived by using Equation (2).…”

Section: Evaluation Of Strength and Strain Modelsmentioning

confidence: 99%

“…Moreover, in its service life, damages can be attributed to various reasons such as cracking and peeling of the concrete cover, occurrence of an earthquake, increase in live loads, or an accident, for example, fire and explosions [1]. In addition, corrosion of steel reinforcement and carbonation of concrete are also some of the problems which arise worldwide depending on the exposure of the structure to its external environment [2]. Hence, to maintain the structural integrity and safety requirements, the damaged and structurally deficient buildings need to be strengthened or rebuilt.…”

Section: Introductionmentioning

confidence: 99%

Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique

Wahab

Srinophakun

Hussain³

et al. 2019

Fibers

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The strengthening and rehabilitation of concrete members is an important issue which arises worldwide. Carbon, aramid and glass fiber reinforced polymer (FRP) composites are mainly used for strengthening and rehabilitation. However, its use is limited on a small scale because of its high price, lack of availability and environmental impacts. The solution of this issue gives rise to the use of locally available natural fibers and low-cost synthetic fibers. This paper presents the experimental and analytical results of circular and square concrete columns confined with jute-polyester hybrid FRP composites. The main objective of this study is to evaluate the viability and performance of concrete confined with the hybridization of jute and polyester (FRP) composite sheets to utilize its superior properties. A novel hybrid technique has been applied for the wrapping of fiber sheets. The fiber sheets were applied in such a way that a uniform bond between the inner and outer layer was achieved. A total of 32 plain, standard size circular and square concrete specimens, externally wrapped with a jute-polyester FRP (JPFRP) composite, were tested under monotonic axial compressive loads. The result shows that JPFRP confinement increased the strength, strain and ductility index ranged between 1.24 and 2.61, 1.38 and 8.97, and 4.94 and 26.5 times the un-jacketed specimen, respectively. Furthermore, the wrapping has a significant effect on the low-strength specimens, having a circular cross-section. For high strength specimens, the post-peak stress-strain behavior was dominated by the outer polyester jacket because of its large rupture strain. Additionally, the test results were used to evaluate the existing strength-strain models derived for conventional FRPs. The models predicted values either underestimating or overestimating the compressive strength and strain of JPFRP-confined specimens. However, the strength models performed better than the strain models. The JPFRP wrapping significantly enhanced the strength, fracture energy, ductility index, and post-peak response. Therefore, JPFRP confinement can be used for a small-scale application, where little strength and high ductility is demanded. Moreover, it can be used to prevent the peeling of the concrete cover and moisture penetration into the concrete.

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“…The primary effects of corrosion on RC elements are cross-section loss of steel reinforcement, decayed mechanical properties of reinforcement, reduction in bond strength between reinforcement and concrete, and reduction in concrete compressive strength due to the cracking [1][2][3][4][5]. These mechanical damages result in the reduced structural capacity of RC elements and subsequently of the whole structure, as highlighted by several experimental and numerical studies carried out in the past few decades [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Residual Flexural Capacity of Corroded Prestressed Reinforced Concrete Beams

Kioumarsi

Benenato

Ferracuti

et al. 2021

Metals

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Infrastructures and industrial buildings are commonly exposed to aggressive environments and damaged by corrosion. In prestressed reinforced concrete structures, the potential risks of corrosion could be severe since reinforcements are already subjected to high amounts of stress and, consequently, their load-bearing capacity could abruptly decrease. In recent years, some experimental studies have been conducted to explore the flexural behavior of corroded pretensioned reinforced concrete (PRC) beams, investigating several aspects of residual structural performance. Although many studies have been done in this area, there is no concise paper reviewing the state-of-the-art research. Accordingly, the main objective of this paper is to provide a review of the available experimental tests for residual capacity assessment of corroded PRC beams. Based on the state-of-the-art review, a degradation law for the flexural strength of corroded PRC beams is suggested.

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Ultimate Flexural Capacity of Reinforced Concrete Elements Damaged by Corrosion

Cited by 20 publications

References 46 publications

Diagnostic Reliability in the Assessment of Degradation in Precast Concrete Elements

Diagnostic Reliability in the Assessment of Degradation in Precast Concrete Elements

Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique

Residual Flexural Capacity of Corroded Prestressed Reinforced Concrete Beams

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