Chloride-Induced Corrosion of Steel in Alkali-Activated Mortars Based on Different Precursors

Scientific paper - Original scientific paper

• Author: Antonino Runci
• Author: Marijana Serdar
• Author's institution: University of Zagreb; Faculty of Civil Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract (english)

The low environmental impact and high long-term performance of products are becoming imperative for the sustainable development of the construction industry. Alkali-activated materials (AAMs) are one of the available low-embodied-carbon alternatives to Portland cement (OPC). For their application in the marine environment or where de-icing salts are used, it is of utmost importance to demonstrate their equal or better performance compared to OPC. The aim of this study was to compare the corrosion behaviour of the steel in AAMs based on different regionally available by-products with the behaviour of the steel in OPC. The by-products used were fly ash, slag, silica fume, and iron-silica fines. The corrosion process of each system was monitored by the corrosion potential and polarisation resistance during exposure to tap water and chloride solution over a period of almost one year. Certain AAMs showed a higher resistance to chloride penetration compared to OPC, which was attributed to the smaller number of capillary pores and higher gel phase precipitation. The same corrosion resistance compared to OPC was achieved with alkali-activated fly ash and alkali-activated slag mortars. The stability of the systems in tap water and chloride solution was confirmed by the visual assessment of the steel surface at the end of the test period.

• Keywords (english): alkali-activated mortar; corrosion; chloride; pore structure; chloride migration
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Materials
• Numbering: vol. 13, no. 22, pp. 1-17
• p-ISSN: 1996-1944
• DOI: https://doi.org/10.3390/ma13225244
• URN:NBN: urn:nbn:hr:237:889526
• Publication: 2020-11-20
• Project: Number: UIP-2017-05-4767; Title (croatian): Alternativna veziva za beton: razumijevanje mikrostrukture za predviđanje trajnosti; Title (english): Alternative binders for concrete: understanding microstructure to predict durability; Acronym: ABC; Leader: Marijana Serdar; Jurisdiction: Croatia; Funding stream: Installation Research Projects
• Document URL: https://www.mdpi.com/1996-1944/13/22/5244
• Type of resource: Text
• Access conditions: Open access
• Created on: 2024-07-12 11:42:52