English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The steel-concrete interface (SCI) is known to play a major role in corrosionof steel in concrete, but a fundamental understanding is still lacking. Onereason is that concrete's opacity complicates the study of internal processes.Here, we report on the application of bimodal X-ray and neutron microtomographyas in-situ imaging techniques to elucidate the mechanism of steel corrosion inconcrete. The study demonstrates that the segmentation of the specimencomponents of relevance - steel, cementitious matrix, aggregates, voids,corrosion products - obtained through bimodal X-ray and neutron imaging is morereliable than that based on the results of each of the two techniquesseparately. Further, we suggest the combination of tomographic in-situ imagingwith ex-situ SEM analysis of targeted sections, selected on the basis of thesegmented tomograms. These in-situ and ex-situ characterization techniques wereapplied to study localized corrosion in a very early stage, on reinforcedconcrete cores retrieved from a concrete bridge. A number of interestingobservations were made. First, the acquired images revealed the formation ofseveral corrosion sites close to each other. Second, the morphology of thecorrosion pits was relatively shallow. Finally, only about half of the total 31corrosion initiation spots were in close proximity to interfacial macroscopicair voids, and above 90 percent of the more than 160 interfacial macroscopicair voids were free from corrosion. The findings have implications for themechanistic understanding of corrosion of steel in concrete and suggest thatmultimodal in-situ imaging is a valuable technique for further related studies.

Chloride-induced corrosion of steel in concrete -- insights from bimodal neutron and X-ray microtomography combined with ex-situ microscopy