Effects of binders characteristics and concrete dosing parameters on the chloride diffusion coefficient

Ribeiro, Daniel Véras; Pinto, S. A.; Júnior, Nilson S. Amorim; Neto, José S. Andrade; Santos, I.H.L.; Marques, Saulo L.; França, Mavisson Júlio Santos de

doi:10.1016/j.cemconcomp.2021.104114

Cited by 30 publications

(10 citation statements)

References 39 publications

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“…It´s known that the aluminate content in the mixture and the porosity of concrete are fundamental parameters in the control of chloride diffusion [44], [54]. Comparing the results of the optimized concretes with those from literature, the results show that the lower chloride binding capacity can be compensated using particle packing optimization to change the concrete pores network structure in concrete with low cement content until certain levels.…”

Section: Unidirectional Chloride Diffusion Testmentioning

confidence: 90%

“…In other words, porosity, and tortuosity of pores, obtained by particle packing optimization, seem to be more important than the amount of Portland cement. According to Ribeiro et al [44] higher cement levels for concretes without additions and with the same characteristics (w/c, type of cement and mortar content) should favor an increase in durability (less diffusivity), as a result of the increase in the aluminate content in the mixture, originated from the Portland cement. However, this effect is less significant than the change of more representative parameters, mainly the water/binder ratio.…”

Section: Rapid Chloride Migration (Rcm) Testmentioning

confidence: 98%

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Mechanical performance and chloride penetration resistance of concretes with low cement contents

Cândido

Meira

Quattrone

et al. 2022

Rev. IBRACON Estrut. Mater.

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The concern about the environment has been leading the construction industry to adopt more sustainable practices. The main environmental impact of concrete is related to CO2 emissions coming from cement, particularly from the cement content in concrete. For this reason, this research evaluates the performance of concretes with partial replacement of Portland cement by limestone filler and silica fume. These concretes were proportioned to improve particles’ packing and paste volume optimization. The compressive strength was determined to assess their mechanical performance. Their durability was investigated by capillary absorption and chloride penetration resistance. Results indicate that concretes showed a better efficiency in terms of binder intensity, with values close to the minimum found in literature (5 kg.m-3.MPa-1). It was also observed that even concretes with cement content lower than the minimum recommended by standards showed better performance than regular concretes regarding the chloride’s penetration.

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Section: Unidirectional Chloride Diffusion Testmentioning

confidence: 90%

Section: Rapid Chloride Migration (Rcm) Testmentioning

confidence: 98%

Mechanical performance and chloride penetration resistance of concretes with low cement contents

Cândido

Meira

Quattrone

et al. 2022

Rev. IBRACON Estrut. Mater.

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“…Higashiyama et al [30] reported that a lower w/c is more effective in resisting chloride ingress (having a lower chloride diffusion coefficient). Similarly, Ribeiro et al [31] described that a low w/b can effectively decrease the porosity and chloride diffusion coefficient in cement-based composites. In addition, to reach an extremely high resistance to chloride penetration, the w/b must be less than 0.40.…”

Section: Introductionmentioning

confidence: 92%

Modelling of Chloride Concentration Profiles in Concrete by the Consideration of Concrete Material Factors under Marine Tidal Environment

Liu

et al. 2022

JMSE

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The corrosion of reinforcement induced by chloride ions is one of the most significant causes of durability deterioration for reinforced concrete (RC) buildings. The concrete material factors, including the water-to-cement ratio (w/c) of concrete, as well as the content, shape, particle grading, and random distribution of coarse aggregate embedded in mortar, have a marked effect on chloride transport performance within concrete. However, comprehensive consideration for the effects of both w/c and coarse aggregate performances on chloride diffusion characteristics in concrete is scarce, especially regarding the chloride diffusion model of concrete. In this paper, an indoor exposure experiment exploring chloride ions intruding into mortar and concrete specimens with w/c = 0.4, 0.5 and 0.6 was carried out, in order to acquire the chloride diffusion parameters for concrete three-phases composites. Based on the numerical algorithm of random generation and placement of two-dimensional random convex polygon coarse aggregate, mesoscopic numerical models for concrete, considering various coarse aggregate contents as well as grading, were established. Using the numerical simulation method of finite element analysis for chloride transport in cement-based materials, which can replace some of the exposure tests, the influences of w/c, coarse aggregate content and grading on chloride diffusion performance in concrete mesoscopic models were systematically probed. According to the Fick’s second law, a chloride diffusion model by the consideration of w/c, volume fraction of coarse aggregate (VFCA), and maximum size of coarse aggregate (MSCA) was developed to assess the chloride concentration profiles in concrete under arbitrary w/c, coarse aggregate content, and coarse aggregate grading conditions. Certainly, the precision accuracy for this proposed chloride diffusion model was validated. The research results can provide theoretical support for chloride erosion behavior and structural durability assessment of concrete with different mix proportions.

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“…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]. Some researchers [47]- [49] have also observed that the addition of 10% silica fume in relation to the mass of cement promoted better refinement of the microstructure.…”

Section: Accelerated Migration Testmentioning

confidence: 99%

“…However [28], [47], used this classification in articles that evaluated the chloride diffusion by the method of UNE 83987 [15]. Some researchers [47]- [49] have also observed that the addition of 10% silica fume in relation to the mass of cement promoted better refinement of the microstructure. However, according to the results presented in Table 5, it was found that this improvement also occurred with an increase in the mortar content.…”

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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Effects of binders characteristics and concrete dosing parameters on the chloride diffusion coefficient

Cited by 30 publications

References 39 publications

Mechanical performance and chloride penetration resistance of concretes with low cement contents

Mechanical performance and chloride penetration resistance of concretes with low cement contents

Modelling of Chloride Concentration Profiles in Concrete by the Consideration of Concrete Material Factors under Marine Tidal Environment

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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