Carbonation Rate and Reinforcing Steel Corrosion of Concretes with Recycled Concrete Aggregates and Supplementary Cementing Materials

Arredondo-Rea, S.P.; Higuera, Ramón Corral; Gómez-Soberón, José Manuel; Castorena-González, J.H.; Orozco-Carmona, Víctor M.; Almaral-Sánchez, Jorge Luis

doi:10.1016/s1452-3981(23)13438-9

Cited by 40 publications

(4 citation statements)

References 26 publications

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“…The depletion of portlandite caused by the concurrent pozzolanic reaction and carbonation causes the structure of the calcium silicate hydrate to deteriorate due to decalcification, weakening the microstructure of the concrete. For example, Arredondo-Rea et al [35] showed that despite the improvement in porosity, RA mixes containing SCMs carbonate faster than mixes without SCMs (e.g., 30% increase for fly ash). Therefore, the problem of carbonation is more complex than the sole determination of the porosity of RAC.…”

Section: Carbonationmentioning

confidence: 99%

Insights on the Corrosion Resistance of Reinforced Recycled Aggregate Concrete

Zaccardi

Pico-Cortés²,

Etcheverry

et al. 2022

CMD

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Recycled aggregate produced from crushed waste concrete is suitable for use in structural concrete. It reduces the demand for non-renewable resources and also for energy in general. However, RA is more porous than most natural aggregates. The porosity of the concrete cover defines the corrosion resistance of reinforced concrete, and it is therefore disputed how the use of recycled aggregate may affect the durability of reinforced concrete. This paper describes the corrosion-related performance of reinforced concrete with recycled aggregates in the initiation stage (determined by the carbonation and chloride ingress) and propagation stage (determined by the electrical resistivity and cracking) of corrosion. The aspects of interest are not only the porosity of RA but also its effects on the chloride binding, carbonation, electrochemical properties and corrosion cracking development.

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Section: Carbonationmentioning

confidence: 99%

Insights on the Corrosion Resistance of Reinforced Recycled Aggregate Concrete

Zaccardi

Pico-Cortés²,

Etcheverry

et al. 2022

CMD

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“…In concretes made with blast-furnace slag values even higher than 20 mA m −2 were determined [7]. At 95% and 65% R.H., a more modest increase of corrosion current density was observed in concrete made with fly ash in comparison with concrete with Portland cement [21,22]. Hence, due to the growing interest in supplementary cementitious materials, SCMs, to improve the sustainability of RC structures, and the limited studies carried out on SCMs, the influence of the type of binder on the corrosion current density in different exposure conditions needs to be further investigated.…”

Section: Introductionmentioning

confidence: 97%

“…As it can be observed, data regarding the corrosion current density of reinforcement in carbonated concrete mainly refer to laboratory tests, while data in concretes exposed to natural environments are scarce [20]. Furthermore, often Portland cement was considered in the tests, while studies on blended cements are in a limited number, especially for natural pozzolan, limestone and silica fume and very few works allow a direct comparison between concretes made with Portland cement and blended cements [7,[12][13][14]21,22]. In immersed conditions, generally higher corrosion current densities were observed in blended cement compared to Portland cement; for instance, the corrosion current density increased from about 10 mA m −2 in Portland cement concrete to 20 mA m −2 in fly ash concrete [12][13][14] or from about 5 mA m −2 in Portland cement concrete to 7 mA m −2 in fly ash concrete.…”

Section: Introductionmentioning

confidence: 99%

Corrosion rate of carbon steel in carbonated concrete made with different supplementary cementitious materials

Lollini

Redaelli

2021

Corrosion Engineering, Science and Technology

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Carbonation-induced corrosion limits the durability of reinforced concrete structures exposed in urban environments. In these exposure conditions, the propagation phase of corrosion can be an important part of the service life and, hence the knowledge of the corrosion rate is essential for the design. However, data regarding the corrosion rate in carbonated concrete are scarce and mainly refer to Portland cement concrete. This paper reports the corrosion rate and corrosion potential of steel bars embedded in concretes with different binders and water/binder ratios, exposed both outdoor in unsheltered conditions and in laboratory conditions characterised by different temperatures and relative humidities. Concrete resistivity at different depths is also reported and correlations among these parameters are discussed. Corrosion potential, corrosion rate and concrete resistivity were strongly influenced by the relative humidity, while temperature played an important role only at high relative humidity. Steel in Portland cement concrete showed the lowest corrosion rate.

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“…Very few works allow a direct comparison between concretes made with Portland cement and blended cements. [12][13][14][15][16][17] Usually the studies showed higher corrosion rate in blended cement compared to Portland cement.…”

Section: Introductionmentioning

confidence: 99%

Service life of reinforced concrete structures made with blended cements and exposed in urban environment

Lollini

Redaelli

2021

Structural Concrete

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Carbonation-induced corrosion is one of the main causes of degradation of reinforced concrete (RC) structures exposed outdoor in urban environment. To prevent steel corrosion, a durability design, that considers both the initiation and the propagation time, is of fundamental importance. At this aim, the resistance to carbonation of concrete and the steel corrosion rate in the exposure environment need to be known. This paper reports the carbonation coefficient and the corrosion rate of 7-day cured RC specimens made with different binders and exposed outdoor in Milan in unsheltered conditions. Corrosion rates in laboratory conditions with different temperatures and relative humidities are also reported. Experimental data were used to evaluate the service life in unsheltered condition. RC specimens made with Portland cement exhibited the lowest carbonation coefficient and corrosion rate, while specimens with 30% limestone and with 70% ground granulated blast furnace slag the highest.

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Carbonation Rate and Reinforcing Steel Corrosion of Concretes with Recycled Concrete Aggregates and Supplementary Cementing Materials

Cited by 40 publications

References 26 publications

Insights on the Corrosion Resistance of Reinforced Recycled Aggregate Concrete

Insights on the Corrosion Resistance of Reinforced Recycled Aggregate Concrete

Corrosion rate of carbon steel in carbonated concrete made with different supplementary cementitious materials

Service life of reinforced concrete structures made with blended cements and exposed in urban environment

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