Corrosion products resulting from carbonation acting upon chloride-induced corrosion in 22 years old blast furnace slag concrete

Nicoletta Russo, Emanuele Rossi, Timo G. Nijland, Rob Polder, Federica Lollini

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

The Service life evaluation of reinforced concrete structures is usually limited to initiation of corrosion, whilst in practice corrosion in many structures has already reached the propagation stage. To better understand the processes that lead to the cracking and detachment of concrete cover during this phase, knowledge of corrosion products’ development over time is required. This paper investigates corrosion products found in blast furnace slag cement concrete, in which natural carbonation acted upon original chloride-induced corrosion. The sample was cast in 1998, after curing subjected to wet-dry cycles to enhance chloride penetration, and later was exposed to unsheltered outdoor conditions. Corrosion products and textures at the concrete-steel interface and late carbonate veinlets within them have been characterized by a combination of optical microscopy, SEM, Raman spectroscopy and CT scanning.

Original languageEnglish
Title of host publicationCapacity Assessment of Corroded Reinforced Concrete Structures- Proceedings of the fib CACRCS DAYS 2020
EditorsBeatrice Belletti, Dario Coronelli
Publisherfib. The International Federation for Structural Concrete
Pages49-56
Number of pages8
ISBN (Print)978-294064310-3
Publication statusPublished - 2021
Event2nd Workshop on Capacity Assessment of Corroded Reinforced Concrete Structures, CACRCS DAYS 2020 - Virtual, Online
Duration: 1 Dec 20204 Dec 2020

Publication series

Namefib Symposium
ISSN (Print)2617-4820

Conference

Conference2nd Workshop on Capacity Assessment of Corroded Reinforced Concrete Structures, CACRCS DAYS 2020
CityVirtual, Online
Period1/12/204/12/20

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