Prediction of Chloride Ingress in Steel Fibre Reinforced Concrete Under Bending Load

Wang, Qiannan; Sun, Wei; Guo, Liping; Gu, Chengfan; Zong, Jinyu

doi:10.13168/cs.2017.0045

Cited by 6 publications

(7 citation statements)

References 25 publications

(29 reference statements)

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“…Moreover, D cr in FRC was one third smaller than that in PL. This relationship is close to the results reported in Wang et al (2018). The obtained D cr was adopted in the case study to calculate the corrosion initiation time in the cracked region.…”

Section: Chloride Diffusion In Cracked Concretesupporting

confidence: 85%

“…A recent investigation found the chloride diffusion coefficient to be reduced by 30-38% in steel fibre reinforced concrete beams compared to plain concrete ones, when the maximum bending stress in each specimen type was half the ultimate strength (Wang, Sun, Guo, Gu, & Zong, 2018). Other studies have also shown that adding fibres may significantly reduce corrosion-induced cover cracking, prevent cover spalling (Chen & Yang, 2019;Sadrinejad, Ranjbar, & Madandoust, 2018) and improve the residual post-peak bond capacity of corroded specimens (Berrocal, Fernandez, Lundgren, & L€ ofgren, 2017), as compared to reinforced mortar or concrete specimens without fibres.…”

Section: Introductionmentioning

confidence: 98%

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Comparison of the service life, life-cycle costs and assessment of hybrid and traditional reinforced concrete through a case study of bridge edge beams in Sweden

Chen

Berrocal

Löfgren

2021

Structure and Infrastructure Engineering

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The edge beams of reinforced concrete bridges with de-icing salts sprayed experience extensive corrosion damage. The average service life of edge beams needing replacement in Sweden has been reported as only 45 years, causing great economic loss to both owners and users. Hence, finding a durable solution for edge beams would benefit society. Hybrid reinforced concrete structures, produced by adding a low-to-moderate fibre content into traditional reinforced concrete, can effectively limit the service crack width and improve resistance to chloride-induced corrosion damage. In this paper, different alternatives of hybrid and traditional reinforced edge beams were designed for a case study. The service life of the alternatives was compared by conducting chloride diffusion calculations and by applying a corrosion-induced cracking model. The economic and environmental (indicated by greenhouse gas emissions) benefits of using hybrid reinforced edge beams were assessed by life-cycle cost analysis and life-cycle assessment. The results showed that the service life of edge beams made of hybrid reinforced concrete can be prolonged by over 58%, thereby enabling a significant reduction in the total life-cycle costs and annual total greenhouse gas emissions.

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Section: Chloride Diffusion In Cracked Concretesupporting

confidence: 85%

Section: Introductionmentioning

confidence: 98%

Comparison of the service life, life-cycle costs and assessment of hybrid and traditional reinforced concrete through a case study of bridge edge beams in Sweden

Chen

Berrocal

Löfgren

2021

Structure and Infrastructure Engineering

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“…This section discusses the existing models that deal with FRC especially in the area of corrosion. In a study by Wang et al [ 128 ], time to corrosion initiation of FRC was evaluated using Fick’s second law as shown in Figure 8 . The authors note that, although Fick’s second law is not able to physically represent the variety of mechanisms that lead to chloride ingress in concrete (e.g., capillary suction, wick action, wetting and drying cycles, etc.…”

Section: Remaining Service Life Of Frc Infrastructuresmentioning

confidence: 99%

Effect of Fibers on Durability of Concrete: A Practical Review

2020

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This article reviews the literature related to the performance of fiber reinforced concrete (FRC) in the context of the durability of concrete infrastructures. The durability of a concrete infrastructure is defined by its ability to sustain reliable levels of serviceability and structural integrity in environmental exposure which may be harsh without any major need for repair intervention throughout the design service life. Conventional concrete has relatively low tensile capacity and ductility, and thus is susceptible to cracking. Cracks are considered to be pathways for gases, liquids, and deleterious solutes entering the concrete, which lead to the early onset of deterioration processes in the concrete or reinforcing steel. Chloride aqueous solution may reach the embedded steel quickly after cracked regions are exposed to de-icing salt or spray in coastal regions, which de-passivates the protective film, whereby corrosion initiation occurs decades earlier than when chlorides would have to gradually ingress uncracked concrete covering the steel in the absence of cracks. Appropriate inclusion of steel or non-metallic fibers has been proven to increase both the tensile capacity and ductility of FRC. Many researchers have investigated durability enhancement by use of FRC. This paper reviews substantial evidence that the improved tensile characteristics of FRC used to construct infrastructure, improve its durability through mainly the fiber bridging and control of cracks. The evidence is based on both reported laboratory investigations under controlled conditions and the monitored performance of actual infrastructure constructed of FRC. The paper aims to help design engineers towards considering the use of FRC in real-life concrete infrastructures appropriately and more confidently.

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“…The loading device is demonstrated in Figure 1. The same type of loading device has been adopted in several studies relating to the durability of flexural loaded concrete specimens [23,24]. The applied load was set to be 50 % of the ultimate flexural load of the UHPCs in this study.…”

Section: The Loading Strategymentioning

confidence: 99%

E EFFECT OF NANO-TiO₂ ON THE DURABILITY OF ULTRA-HIGH PERFORMANCE CONCRETE WITH AND WITHOUT A FLEXURAL LOAD

Gu¹

2018

Ceramics - Silikaty

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In this study, the durability of nano-TiO 2 modified ultra-high performance concrete (UHPC) with and without a flexural load was experimentally investigated. Firstly, the mechanical properties of UHPC with various nano-TiO 2 contents were tested, and the results showed that UHPC with 1 wt. % nano-TiO 2 exhibited the best mechanical properties. Then, 1 wt. % nano-TiO 2 was added into UHPC to evaluate its effects on dry shrinkage, chloride ingress resistance, freeze-thaw resistance and carbonation resistance of UHPC. The effect of the flexural load on the durability of UHPC was also studied. The dry shrinkage of nano-TiO 2 modified UHPC was reduced compared with the control UHPC. The flexural load accelerated the chloride penetration process in the tensile region of the UHPC specimens, and the addition of nano-TiO 2 mitigated the negative influence of flexural load on the chloride ingress resistance of UHPC. Moreover, the addition of nano-TiO 2 particles also improved the freeze-thaw resistance of the flexural loaded UHPC by reducing the mass loss after enduring 800 freeze-thaw cycles. Carbonation was not detected in all UHPC specimens after being exposed to 60 % CO 2 for 180 days. Furthermore, the MIP results indicated that the addition of nano-TiO 2 refined the pore structure of the UHPC, which improved the mechanical properties and durability of the UHPC.

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Prediction of Chloride Ingress in Steel Fibre Reinforced Concrete Under Bending Load

Abstract: Chloride induced corrosion is an important reason for the deterioration of reinforced

Cited by 6 publications

References 25 publications

Comparison of the service life, life-cycle costs and assessment of hybrid and traditional reinforced concrete through a case study of bridge edge beams in Sweden

Comparison of the service life, life-cycle costs and assessment of hybrid and traditional reinforced concrete through a case study of bridge edge beams in Sweden

Effect of Fibers on Durability of Concrete: A Practical Review

E EFFECT OF NANO-TiO₂ ON THE DURABILITY OF ULTRA-HIGH PERFORMANCE CONCRETE WITH AND WITHOUT A FLEXURAL LOAD

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