Service-Life Assessment of Existing Precast Concrete Structure Exposed to Severe Marine Conditions

Segura, Ignacio; Cavalaro, Sérgio Henrique Pialarissi; Fuente, Albert de la; Aguado, Antonio; Alegre, Vicente

doi:10.1061/(asce)cf.1943-5509.0000765

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…The thickness of concrete cover is emphasized in this paper as one of the key factors determining the durability of reinforced concrete structural elements susceptible to the aggressive influence of the external environment, especially in the context of the corrosion risk of reinforcement [4,5]. This thickness determines the speed of penetration of aggressive substances deep into the reinforced concrete element, which results in damage to the passive layer on the bars and initiation of reinforcement corrosion processes.…”

Section: Introductionmentioning

confidence: 99%

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Manufacturing Errors of Concrete Cover as a Reason of Reinforcement Corrosion in a Precast Element—Case Study

et al. 2019

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The article concerns the assessment of technical condition of the precast loggia wall in a large panel building after 25 years of use as well as the cause of its damage. As a result of the study, cracks and losses of the concrete cover were found. Corrosion products were visible on exposed reinforcing rods. The reinforcement distribution and concrete cover thickness in loggia wall were estimated using a rebar detector. The corrosion assessment of reinforcement was performed using a semi non-destructive galvanostatic pulse method that allows the location of areas of corrosion and estimate the reinforcement corrosion activity. The phase composition of the concrete cover was analyzed. The test results showed an insufficient thickness of the concrete cover as the main cause of loggia wall damage. The research indicated that manufacturing errors made in the prefabrication plants affect the technical condition of precast elements and may lead to the damage of the structure well before the expected of its service life. In the case of manufacturing errors causing the implementation of an element with a concrete cover that does not meet the standard requirements for thickness and tightness, it is recommended to use protective coatings to increase the element’s durability to the designed level.

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Section: Introductionmentioning

confidence: 99%

“…A diffractogram of a sample of concrete taken from loggia wall near point(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). Signs: C-Calcite, Q-Quartz, and G-Gypsum.…”

mentioning

confidence: 99%

Manufacturing Errors of Concrete Cover as a Reason of Reinforcement Corrosion in a Precast Element—Case Study

et al. 2019

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“…Also, studies have explored the structural risk of MiC projects at the operations stage. Segura et al (2016) reported that a cooling tower for a thermal power plant constructed of precast concrete suffered a severe deterioration within 3 years of its service-life following a severe exposure to marine conditions. Although the early deterioration was associated with the wetting-drying cycles and chloride-induced corrosion, it demonstrates the potential weaknesses of MiC under severe marine conditions.…”

Section: Structural Risksmentioning

confidence: 99%

Risks of modular integrated construction: A review and future research directions

2019

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Despite the extensively documented benefits of modular integrated construction (MiC), stakeholders continue to remain sceptical in its adoption due to the associated risks and uncertainties. The unique business model of MiC nurtures several risks and uncertainties different from those of the conventional construction approach. Although MiC is gaining attention with its market expansion, there is no systematic evaluation of the research progress. This research conducted a systematic review and synthesis of published studies on the risks of MiC from 1992 to 2019 inclusive. The analysis reveals that the research publications on risks of MiC witnessed a steady growth, with significant progress occurring in the last decade. This implies that the risk of MiC has gained more attention in the construction engineering and management domain in recent times. Existing empirical studies have focused more on perceived implementation risks; supply chain risks; schedule risks; investment risks; structural risks; ergonomic risks; and MiC risk management strategies, which indicates that MiC is associated with a host of risk events. The paper further identified the critical risk events (CREs) in the application of MiC based on frequency of occurrence. The identified CREs contribute to the checklists of risk events in the implementation of offsite construction, which may be useful in risk planning especially where the MiC market is still fledgling, and fewer or no bespoke risk assessment exist. The paper highlighted research gaps in existing studies and proposed areas for further studies. Thus, the paper makes a useful contribution to the scholarly literature on the risk of OSC and maybe useful to offsite construction researchers, industry practitioners, and project managers.

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“…Compared to cast in situ concrete, precast concrete could be of better quality since the mixture ratio and curing conditions are better controlled in factories [15][16][17]. Such advancement enables concrete cover to better block detrimental corrosive agents and thus is beneficial for durability.…”

Section: Introductionmentioning

confidence: 99%

Service Life Prediction of Precast Concrete Structures Exposed to Chloride Environment

Zhang

Zeng

Fang³

et al. 2019

Advances in Civil Engineering

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Chloride-induced corrosion is widely accepted as one of the primary causes of premature deterioration for concrete structures in marine or deicing salt environment. For precast concrete (PC) structures, such durability problems may even be severer because defects in joint areas, e.g., cracks caused by grout shrinkage and improper construction, can accelerate chloride ion transportation process and may cause the interface shear failure when subjected to seismic load. By applying the path probability model (PPM) and reliability theory, a probabilistic framework was proposed to predict three limit states of PC structures, including corrosion initiation, serviceability limit state, and ultimate limit state. Using Monte Carlo simulation, a beam-to-column joint was further analyzed to illustrate the differences between PC structures and those cast in situ. The analysis indicates that corrosion initiation and serviceability limit state are sensitive to chloride diffusivity at connection area, and the higher pitting factor can significantly influence the bearing capacities of PC structures.

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Service-Life Assessment of Existing Precast Concrete Structure Exposed to Severe Marine Conditions

Cited by 12 publications

References 25 publications

Manufacturing Errors of Concrete Cover as a Reason of Reinforcement Corrosion in a Precast Element—Case Study

Manufacturing Errors of Concrete Cover as a Reason of Reinforcement Corrosion in a Precast Element—Case Study

Risks of modular integrated construction: A review and future research directions

Service Life Prediction of Precast Concrete Structures Exposed to Chloride Environment

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