Influence of different corrosion solutions on reinforced concrete by DIC and traditional strain test

When the corrosion expansion stress of the steel reinforcement exceeds the ultimate tensile strength of the concrete, the concrete will crack and eventually cause structural damage. Therefore, direct characterization methods of steel corrosion expansion stress can help predict the concrete cracking time, prevent corrosion expansion and repair...

A probabilistic approach for estimating corrosion possibility of reinforced concrete structure considering crack development

Reinforcement corrosion induced by chloride ingress is one of the major threats of reinforced concrete (RC) structures exposed to chloride attack. The cracks of concrete cover provide additional paths of chloride ingress and facilitate the reinforcement corrosion. Current information regarding the influence of crack development on corrosion...

A study of the elastic moduli and chemical composition of corrosion product naturally-generated due to chlorides through nano-indentation and energy dispersive X-ray spectrometry (EDS)

An important input parameter for numerical models that simulate cracking of the concrete cover due to reinforcement corrosion is the Elastic modulus of corrosion product (Ecp). Despite its relevance, Ecp is subject of significant variations according to the values reported in the literature, which vary from less than 100 MPa up to 360 GPa....

Chloride-induced corrosion of steel reinforcement in alkali-activated slag/ metakaolin blended concretes

The aim of this study is to understand the corrosion mechanism of steel embedded in alkali-activated slag/metakaolin blended concretes via electrochemical testing after 407 days of exposure to a 3.5 wt.% NaCl solution, with an emphasis on characterising the material prior to the onset of corrosion. In order to accurately depict the material’s...

Application of ultra-fine fly ash as cement replacement for sustainable concrete with optimal packing design

In the present study, a proprietary 0.2 tonne/h Dusty Cloud Separation (DCS) technology prototype by Value Ash Technologies NV (Belgium) was used to obtain ultra-fine fly ash as a novel by-product. Two types of Class F fly ash were used: separated fly ash (FA1) with particle size < 9.3 μm and ultra-fine fly ash (FA2) < 4.6 μm as sub-fraction of...

Modelling effect of coarse aggregates on oxygen transport and corrosion products precipitation in reinforced concrete

The structure of concrete, in particular the microstructure of the steel-concrete interface (SCI), can significantly affect corrosion of rebars. To support corrosion, oxygen needs to diffuse from the ambient environment to the steel surface. Meanwhile, corrosion products transport through the SCI and precipitate in concrete. Transport properties...

Simultaneous optical and electrochemical monitoring of the protective effect of functional surface healing agents

Encapsulation of reactive agents embedded within a matrix is the most studied concept to develop self-healing materials. The most common approaches employ either a single component with catalyst dispersed in the matrix or a single environment-reactive component for corrosion protection [1]. Recently an approach for corrosion protection based on...

Controlled release of inhibitors from composite organic coatings: A "green" way of corrosion protection

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Polymeric nano-materials for corrosion control of steel in concrete

Polymeric nano-materials utilization in reinforced concrete, aiming to deal with steel corrosion was developed in previous works. Promising results were obtained with PEO–b–PS nano-formations, both in terms of enhanced bulk matrix properties and improved steel corrosion resistance. Recent research has been focusing on a cheaper and commercially...

Self-healing coatings based on electrochemical potential triggered release systems

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Electrodeposited zinc-nanocomposite-coatings and multi-component-coatings for smart corrosion protection

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SiO2 mesoporous thin films as nanocontainers for corrosion inhibitors in self-healing anticorrosion coatings

Among the different alternative surface treatments developed in view of the coming prohibition of chromates in aeronautic applications, sol-gel coatings show very promising properties. These layers provide a barrier against aggressive environments. Moreover, their performance can be improved by introducing inhibitive agents in the coating....

Self-healing corrosion protective coatings by TiO2 particles and a pH-sensitive organic agent on a magnesium alloy

A self-healing corrosion protective coating was developed using TiO2 particles and casein as pH-sensitive organic agents that is also environmentally friendly materials. A film structured of TiO2 particles was formed on a substrate (magnesium alloy) by dip-coating followed by immersion in a casein solution. Casein was inserted and fixed in the...

Self-healing coatings utilizing a shape memory effect

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Protective coatings with multi-level self-healing properties

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Life extension in protective coatings via self-healing technology

As the field of self-healing materials continues to grow, novel self-healing concepts and chemistries are being developed for a variety of applications including coatings. Self-healing functionality is typically considered for incorporation in coatings to solve two basic challenges including restoration of aesthetic properties and restoration of...

Modeling stray current and its influence on corrosion of steel sheet piling

Stray currents are known to promote corrosion of nearby metallic structures. Electrolysis is the responsible phenomenon. Where currents enter the metallic structure, the latter is protected. The construction corrodes at the location where currents exit through the ground to be collected by the substation. The extent of such corrosion has until...