Experimental assessment of accelerated test methods for determining chloride diffusion coefficient in concrete

Sell, Félix Krolow; Wally, Gustavo Bosel; Teixeira, Fernando Ritiéle; Magalhães, Fábio Costa

doi:10.1590/s1983-41952021000400007

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…Using different test methods to determine the chloride penetrability in the concrete, however, lead to different results for the same concrete. This variation in the results was observed, for example, by Castellote and Andrade [34] and Sell Junior et al [35]. Thus, it is essential that when specifying a specific target value for the chloride penetrability in a durability design, there is a clear indication of which test method should be adopted and the definition of which coefficient should be considered -whether effective or apparent, for example.…”

Section: Chloride Diffusion Coefficientmentioning

confidence: 94%

On factors affecting probabilistic service life modeling of concrete structures under marine environments

Wally

Magalhães

Real

et al. 2022

Rev. IBRACON Estrut. Mater.

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Concrete durability design has received increasing importance recently, with specifications moving from prescriptive to performance based. In performance-based approaches, it is essential to evaluate and calibrate service life models capable of reliably representing the phenomenon that triggers the degradation process. This paper aims to discuss the main concepts related to the probabilistic service life modeling of reinforced concrete structures under chloride environments, considering the application of different prediction models. Through numerical analysis, parametric differences among chloride penetration models are evidenced, and the results, their variability, and the admitted failure conditions are analyzed. An overview of the current scenario of the durability design of concrete structures is presented. Aspects associated with characteristic service life, the definitions of durability limit states, and their respective target failure probabilities are discussed.

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Section: Chloride Diffusion Coefficientmentioning

confidence: 94%

On factors affecting probabilistic service life modeling of concrete structures under marine environments

Wally

Magalhães

Real

et al. 2022

Rev. IBRACON Estrut. Mater.

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“…The methods commonly used to determine the chloride diffusion coefficient are defined by the standards ASTM C 1556 [13,14], AASHTO T 259 [15] and NT BUILD 443 [16]. They are based on Fick's 2nd law of diffusion and their main disadvantage is the testing duration.…”

Section: Chloride Diffusion In Concrete Incorporating Ground Granulat...mentioning

confidence: 99%

Chloride Diffusion in Concrete Made with Coal Fly Ash Ternary and Ground Granulated Blast-Furnace Slag Portland Cements

et al. 2022

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Ternary Portland cement usage with a high amount of cement constituents different from clinker can afford great climate change advantages by lowering the Portland cement clinker content in the final product. This will contribute to cutting greenhouse gas emissions to close to zero by 2050. Such ternary Portland cements can be composed of different amounts of ground granulated blast-furnace slag (GBFS), coal fly ash (CFA), and clinker (K). Cements made with GGBFS, or CFA boast pozzolanic characteristics. Therefore, they would improve both the concrete compressive strength at later ages and durability. The 28- and 90-days mechanical strength test, non-steady state chloride migration test, described in NT BUILD 492, and natural chloride diffusion test (NT BUILD 443) were performed in concrete. Ternary cements made with GBFS and/or CFA presented better chloride diffusion resistance than concrete made with plain Portland cements. Furthermore, the development of compressive strength was delayed. The service life study was developed for concretes made with ternary cements with regard to the chloride penetration case.

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“…According to Guignone et al [45], the D ns values obtained by the method of UNE 83987 [15] and NT Build 492 [9] show similarities. However, according to Sell Júnior et al [46], the difference between the diffusion coefficients determined by these methods is greater when evaluating the concretes that have greater permeability. However [28], [47], used this classification in articles that evaluated the chloride diffusion by the method of UNE 83987 [15].…”

Section: Accelerated Migration Testmentioning

confidence: 99%

Correlation between diffusion coefficient values of chloride ions obtained through column and ion migration tests in cementitious matrices with varying contents of silica fume and mortar

Pinto

Machado

Ribeiro

2022

Rev. IBRACON Estrut. Mater.

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Corrosion is one of the main phenomena that lead to pathological manifestations in reinforced concrete structures under aggressive environments. with the chloride ion being the most responsible for its occurrence. In this way, understanding the transport mechanisms of this ion through the microstructure of the concrete is of fundamental importance to prevent or delay the penetration of these aggressive agents to guarantee a durable structure. In the literature, there are extensive studies concerning the diffusion of chlorides in concrete and the influence of pozzolanic additions in this mechanism. However, only a few correlate the different methods of analysis. This work aims to determine the chloride ion diffusion coefficients in concrete containing various levels of silica fume (5%, 10%, and 15%) or varying the mortar content (54%, 80%, and 100%), and compares the results obtained through column tests and chloride migration tests. It was observed that, although the techniques used were quite distinct, the diffusion values obtained were similar, contributing to the validation of both techniques. Furthermore, the variation in the mortar ratio causes a reduction in the interfacial transition zone of coarse aggregate/mortars and an increase in the content of aluminates, which promotes a similar effect to the use of silica fume.

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Experimental assessment of accelerated test methods for determining chloride diffusion coefficient in concrete

Cited by 7 publications

References 19 publications

On factors affecting probabilistic service life modeling of concrete structures under marine environments

On factors affecting probabilistic service life modeling of concrete structures under marine environments

Chloride Diffusion in Concrete Made with Coal Fly Ash Ternary and Ground Granulated Blast-Furnace Slag Portland Cements

Correlation between diffusion coefficient values of chloride ions obtained through column and ion migration tests in cementitious matrices with varying contents of silica fume and mortar

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