The effect of two types of modified Mg-Al hydrotalcites on reinforcement corrosion in cement mortar

Yang, Zhiliang; Polder, R.B.; Mol, J.M.C.; Andrade, Carmen

doi:10.1016/j.cemconres.2017.06.004

Cited by 39 publications

(13 citation statements)

References 40 publications

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“…The objective generally is to avoid long test times, while not affecting the mechanism of natural corrosion initiation, nor the C crit . Several techniques to accelerate chloride ingress are possible, including application of an electrical field and wetting/drying cycles (Andrade & Rebolledo, 2012;Bertolini et al, 2013;Castellote et al, 2002;Polder et al, 2017;Poulsen & Sørensen, 2019;Yang et al, 2017). Wetting/drying cycles might be more close to realistic exposure than the application of an electrical field.…”

Section: Introductionmentioning

confidence: 99%

Investigations of accelerated methods for determination of chloride threshold values for reinforcement corrosion in concrete

Käthler

Sørensen

Angst

2021

Sustainable and Resilient Infrastructure

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Testing the critical chloride content (C crit ) in laboratory samples or in samples retrieved from structures enhances the understanding of rebar corrosion initiation in concrete and can result in a significant improvement of predicting the residual service life of ageing structures. A possible drawback of test methods for C crit is that they can be time-consuming. In this work, different accelerated methods for C crit testing are studied and compared. It is found that the acceleration method influences the test results. The results are discussed with respect to evaluation of existing structures and service life modelling.

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Section: Introductionmentioning

confidence: 99%

Investigations of accelerated methods for determination of chloride threshold values for reinforcement corrosion in concrete

Käthler

Sørensen

Angst

2021

Sustainable and Resilient Infrastructure

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“…Although, in reality, corrosion of steel reinforcement is a slow process compared to accelerated testing conditions adopted herein, this test set up allowedcomparing the performance of specimens with different compositions within an acceptable timeframe. This test setup has therefore been commonly used in the literature [32,33,34].…”

Section: Methodsmentioning

confidence: 99%

Development of Nano-SiO2 and Bentonite-Based Mortars for Corrosion Protection of Reinforcing Steel

2019

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In this study, the use of nano-silica (nano-SiO2) and bentonite as mortar additives for combating reinforcement corrosion is reported. More specifically, these materials were used as additives in ordinary Portland cement (OPC)/fly ash blended mortars in different amounts. The effects of nano-silica and bentonite addition on compressive strength of mortars at different ages was tested. Accelerated corrosion testing was used to assess the corrosion resistance of reinforced mortar specimens containing different amounts of nano-silica and bentonite. It was found that the specimens containing nano-SiO2 not only had higher compressive strength, but also showed lower steel mass loss due to corrosion compared to reference specimens. However, this was accompanied by a small reduction in workability (for a constant water to binder ratio). Mortar mixtures with 4% of nano-silica were found to have optimal performance in terms of compressive strength and corrosion resistance. Control specimens (OPC/fly ash mortars without any additives) showed low early age strength and low corrosion resistance compared to specimens containing nano-SiO2 and bentonite. In addition, samples from selected mixtures were analyzed using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Finally, the influence of Ca/Si ratio of the calcium silicate hydrate (C-S-H) in different specimens on the compressive strength is discussed. In general, the study showed that the addition of nano-silica (and to a lesser extent bentonite) can result in higher strength and corrosion resistance compared to control specimens. Furthermore, the addition of nano-SiO2 can be used to offset the negative effect of fly ash on early age strength development.

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“…The addition of 5% of pAB hydrotalcite in mortar specimens resulted in considerably improved resistance of the material to the chloride diffusion, accompanied with small decrease of compressive and flexural strength in units of MPa. Another promising way, besides the mentioned 5% mass substitution of cement by pAB hydrotalcite in the bulk mortar, is the coating of reinforcing steel by part of cement paste coating 20% pAB/ NO 2 [99]. Additionally, relative Mg-Al layered double hydroxides intercalated with hydroxide and organic anions can be applied as the corrosion inhibitors for carbon steel reinforced concrete [100].…”

Section: Hydrotalcites In Reinforced Concrete As Corrosion Inhibitive Additionmentioning

confidence: 99%

Hydrotalcites in Construction Materials

et al. 2020

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Hydrotalcites are layered double hydroxides displaying a variety of stoichiometry caused by the different arrangement of the stacking of the layers, ordering of the metal cations, as well as the arrangement of anions and water molecules, in the interlayer galleries. The compounds of the hydrotalcite group show a wide range of the possible applications due to their specific properties, such as their large surface area, ion exchange ability, the insolubility in water and most of the organic sorbents, and others. Affordability, wide possibilities of manufacturing, and presence of sufficient natural deposits make hydrotalcites potentially very useful for the construction industry, as either a building material itself or an additive in mortars, concrete or in polymers composites used in constructions. Similar possible application of such material is in leakage control in a radioactive waste repository. The effect of use of these materials for ion exchange, anti-corrosion protection, radioactive ions containment, and similar purposes in building materials is examined in this review.

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The effect of two types of modified Mg-Al hydrotalcites on reinforcement corrosion in cement mortar

Cited by 39 publications

References 40 publications

Investigations of accelerated methods for determination of chloride threshold values for reinforcement corrosion in concrete

Investigations of accelerated methods for determination of chloride threshold values for reinforcement corrosion in concrete

Development of Nano-SiO2 and Bentonite-Based Mortars for Corrosion Protection of Reinforcing Steel

Hydrotalcites in Construction Materials

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