Service life prediction of reinforced concrete structures

Liang, Ming-Te; Wang, K.L.; Liang, Chin Wei

doi:10.1016/s0008-8846(99)00109-x

Cited by 68 publications

(26 citation statements)

References 6 publications

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“…0.2 to 2 wt.%, leads to a remarkable decrease in the charge required for corrosion initiation (Bertolini et al2007). Numerical simulation for the influence of stray current and modelling the performance of reinforced concrete structures with this regard are reported (Yu-qiao et al 2010, Peelen, Smulders, Steyn et al, Liu et al 2011, Kerimov et al 2006, Kim et al 1999, Brichau et al 1996, Weyers et al 1998, Liang et al 1999, Andrade 2010. Clearly, the degradation of cement-based systems due to stray current and chloride penetration followed by corrosion has been largely recognized as a serious problem in civil engineering for many years (Bertolini et al 2007, Kish 1981, Whiting 2003, Brown 1980.…”

Section: Technical Backgroundmentioning

confidence: 99%

Mechanical, Electrical and Microstructural Properties of Cement-Based Materials in Conditions of Stray Current Flow

Susanto

Koleva

Çopuroğlu

et al. 2013

ACT

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This investigation presents a comparative study on mechanical properties, electrical resistivity and microstructure of mortar under DC current, compared to mortar in rest (no current) conditions. Monitoring was performed from 24h after casting until 84 days of cement hydration. A current density level of 10 mA/m 2 was chosen as a simulation regime. It was found that the DC current exerts microstructural changes in the bulk mortar matrix and thereby affects electrical properties and mechanical performance. Whereas the latter were slightly influenced, the former were modified to a more significant extent; the current flow was found to cause initial densification of the bulk matrix at earlier stages (until 14 days of age), whereas coarsening of the material was observed after 56 and until 84 days of cement hydration. Additionally, numerical simulation of the stray current distribution is performed, meant to serve as a basis for further elaborated modelling of the level of current density that could exert significant microstructural alterations in a bulk cement-based matrix.

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Section: Technical Backgroundmentioning

confidence: 99%

Mechanical, Electrical and Microstructural Properties of Cement-Based Materials in Conditions of Stray Current Flow

Susanto

Koleva

Çopuroğlu

et al. 2013

ACT

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“…However, it is observed that the diffusion coefficient tends to decrease with time, a function of the continuous changes in concrete structure [16,17]. Besides, the chloride concentration tends to increase at the surface of structural elements in time [18,19].…”

Section: Introductionmentioning

confidence: 99%

Considerations about the service life prediction of reinforced concrete structures inserted in chloride environments

2017

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Nowadays an amount of reinforced concrete structures are presenting problems related with corrosion of reinforcement, mainly that induced by chloride ions. So, many studies are being accomplished to predict the necessary time for chloride ions reach the reinforcement, beginning the propagation of corrosive process. In this paper, three models were selected for analysis to determine their ability in properly predicting the chloride penetration in concrete structures: the solution of 2nd Fick's Law, the complete solution of 2nd Fick's Law, considering the variation of diffusion coefficient and the superficial concentration of chlorides in time; and a model proposed. Analysis of the formulations principles and assessment and applicability of equations were made, taking into account the adequate choice of parameters and variables involved, the difficulty to obtain these parameters, and if the models represent properly the natural phenomena. In order to contribute with the service life prediction of the structures when inserted in saline environments, a mathematical model was developed based in a Focus Groups analysis. Some of the main characteristics of the proposed model are the logic applied for its development and the application easiness. This model was applied in a case study to verify the answer in relation to chloride penetration in some points of a reinforced concrete structure inserted in a saline area. The behavior of the model was consistent with the results of experimental investigations accomplished by other researchers.

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“…Experimental and empirical models are based on the observation and study of the deterioration of materials and components-either in laboratory conditions or through fieldwork assessment-a process that can be translated into degradation functions that express the loss of performance of buildings and their components over time until the end of service life is reached. Several authors [4,[7][8][9] have applied these methods to the service life of façade's coatings, as they are easy to apply and understand and can be rapidly implemented. However, they have also been criticized since they often deal with service life as an absolute value and provide little information on the degradation process, or about the change from a degradation state to the next one, neglecting the variability associated with the degradation process [5].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic analysis of degradation of façade claddings using Markov chain models

et al. 2015

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Abstract In this study, the time-dependent stochastic degradation of three types of claddings is analysed. For this purpose, 203 façades with stone claddings (directly adhered to the substrate), 195 with adhered ceramic claddings and 220 with painted surfaces were analysed. All the façades are located in Lisbon, Portugal. Their degradation condition was assessed through an extensive field work. Based on the data gathered, Markov chains are used to predict the degradation of claddings and to understand, in some detail, how the characteristics of the claddings contribute to the overall degradation. The results show that the distance from the sea and exposure to damp are significant to the degradation of all types of cladding. The type and size of stone plates also influence the degradation of stone claddings. The exposure to wind-rain action has a high impact on the degradation of ceramic claddings. The models proposed provide useful information on the probability of failure of the claddings; these results are fundamental in the context of insurance policies and in the definition of building maintenance plans.

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Service life prediction of reinforced concrete structures

Cited by 68 publications

References 6 publications

Mechanical, Electrical and Microstructural Properties of Cement-Based Materials in Conditions of Stray Current Flow

Mechanical, Electrical and Microstructural Properties of Cement-Based Materials in Conditions of Stray Current Flow

Considerations about the service life prediction of reinforced concrete structures inserted in chloride environments

Probabilistic analysis of degradation of façade claddings using Markov chain models

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