Corrosion of prestress and posttension reinforced concrete bridges

Lau, Kingsley; Permeh, Samanbar; Lasa, Ivan

doi:10.1016/b978-0-12-821840-2.00013-4

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…FRP composites are one of such relatively new construction materials that are resistant to all the factors causing corrosion in steel-reinforced concrete (RC) structures, such as a decrease in concrete pH due to carbonation, chloride penetration, and the diffusion of halides and chemicals [7][8][9][10]. Further, FRP composites are not affected by electromagnetic disturbances from sources such as railroads with DC or AC traction, overhead power lines, and unbalanced currents from three-phase power systems, which contribute to the corrosion of metal structures and the deterioration of reinforced concrete [11].…”

Section: Advantages Of Frp-rc Elementsmentioning

confidence: 99%

Damage Detection in FRP-Reinforced Concrete Elements

Malla,

Khedmatgozar Dolati,

Ortiz

et al. 2024

Materials

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Fiber-Reinforced Polymer (FRP) composites have emerged as a promising alternative to conventional steel reinforcements in concrete structures owing to their benefits of corrosion resistance, higher strength-to-weight ratio, reduced maintenance cost, extended service life, and superior durability. However, there has been limited research on non-destructive testing (NDT) methods applicable for identifying damage in FRP-reinforced concrete (FRP-RC) elements. This knowledge gap has often limited its application in the construction industry. Engineers and owners often lack confidence in utilizing this relatively new construction material due to the challenge of assessing its condition. Thus, the main objective of this study is to determine the applicability of two of the most common NDT methods: the Ground-Penetrating Radar (GPR) and Phased Array Ultrasonic (PAU) methods for the detection of damage in FRP-RC elements. Three slab specimens with variations in FRP type (glass-, carbon- and basalt-FRP, i.e., GFRP, CFRP, and BFRP, respectively), bar diameter, bar depths, and defect types were investigated to determine the limitations and detection capabilities of these two NDT methods. The results show that GPR could detect damage in GFRP bars and CFRP strands, but PAU was limited to damage detection in CFRP strands. The findings of this study show the applicability of conventional NDT methods to FRP-RC and at the same time identify the areas with a need for further research.

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Section: Advantages Of Frp-rc Elementsmentioning

confidence: 99%

Damage Detection in FRP-Reinforced Concrete Elements

Malla,

Khedmatgozar Dolati,

Ortiz

et al. 2024

Materials

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“…The elasticity of the new concrete is a result of these microfibers (Qian et al 2020). Maintaining the flexibility of concrete is important because it allows for self-compaction of the concrete, which is necessary to provide maximum strength in new concrete (Lau et al 2023). When assessing the HPC, sag and slumping flow are crucial factors to consider.…”

Section: Flexibility Of Concretementioning

confidence: 99%

Nanotechnology and high-performance concrete: Evaluating mechanical transformations

Jakhar,

Kumar,

Nagappan

et al. 2024

Multidiscip. Rev.

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The High-performance concrete (HPC) is defined by the attained strength and durability that are superior to conservative techniques. The features of ordinary concrete that are achieved at certain times and locations, used to establish the standards for HPC. The use of nanotechnology in HPC is attracted significant attention globally because of its small particle sizes, filling capacities, enormous surface areas and strong macro quantum tunnel property. By adding nanotechnology to HPC, it increases the whole diameters of the cementations matrix, improves cement hydration and raises matrix density. This study provides a review of current developments in HPC and assesses the effects of different nanotechnology on HPC characteristics, to provide an in-depth understanding of the potential of nanotechnology reinforced in HPC. This review evaluates the mechanical characteristics of HPC containing compressive strength (CS) by applying nano calcium carbonate, nano silicon dioxide, nano titanium dioxide and carbon nano tubes. According to findings in this review, introducing different nanotechnology enhances HPC's mechanical properties while decreasing its flexibility. While integrating nanotechnology into HPC for the greatest possible outcomes in construction, review contributes to expand the collection of information in the area of building materials. To provide a low-impact construction material and an ecologically friendly solution, more consideration is required given to nanoparticles' antibacterial, self-cleaning, air depolluting and air-cooling properties. By increasing the reactivity of various fillers, including nanoparticles with other mineral admixtures reduces the quantity of cement needed in concrete.

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“…Service life predictions for carbonation-induced corrosion can be difficult due to the many variables associated with concrete materials, exposure environment, and electrochemical corrosion processes. [12,13] Relevant to all three of these topical areas is the complex role of moisture in the corrosion process. Carbonation-induced corrosion of steel in concrete can be viewed in two phases: corrosion initiation and corrosion propagation.…”

Section: Carbonation-induced Corrosionmentioning

confidence: 99%

“…[8,9] Among those, carbonation-induced corrosion can also allow for premature degradation of structures. The sometimes longer periods before noticeable external manifestation of corrosion induced structural damage [10,11] may allow for complacency, insufficient allocation of resources for mitigation, and belated repair. As the existing infrastructure in developed nations age and the costs to replace deficient structures increase, there are growing requirements for prolonged service lives of deficient structures to maintain societal physical infrastructure needs.…”

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confidence: 99%

Identification of carbonation‐induced corrosion of steel in concrete by electrochemical testing

Permeh,

Lau

2024

Materials & Corrosion

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Carbonation‐induced corrosion of steel in concrete can allow for premature degradation of structures. Corrosion probes in health monitoring systems can assess concrete carbonation and steel corrosion rates. The electrochemical noise (EN) technique has advantages for corrosion sensing. Instrumented concrete columns were fitted with a carbonation chamber for accelerated testing. EN was assessed through statistical evaluation of noise time signatures, noise resistance, and spectral analysis. The mean noise potential for the electrodes showed electronegative potential and correspondingly high rms noise current, indicative of corrosion activation in carbonated concrete. The estimated corrosion rates obtained from the noise impedance were comparable to those resolved from the polarization resistance and noise resistance. The shot noise analysis indicated isolated spontaneous noise events associated with the activation of local steel anodes. The outcomes of the testing indicate that the placement of low‐cost sensors and passive EN measurements can be used to monitor the onset of carbonation‐induced corrosion of steel in concrete and provide estimates on corrosion rates.

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Corrosion of prestress and posttension reinforced concrete bridges

Cited by 9 publications

References 13 publications

Damage Detection in FRP-Reinforced Concrete Elements

Damage Detection in FRP-Reinforced Concrete Elements

Nanotechnology and high-performance concrete: Evaluating mechanical transformations

Identification of carbonation‐induced corrosion of steel in concrete by electrochemical testing

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