Corrosion performance of steel in blended cement pore solutions

Hren, Miha (author), Kosec, Tadeja (author), Legat, Andraž (author), Bokan-Bosiljkov, Violeta (author)

Blended cements might change the chemistry of the pore solution and subsequently affect the corrosion of steel in concrete. Pore solutions were extracted, analyzed and compared from mortars made of CEM I, CEM II, CEM III and CEM IV cements. Three combinations of carbonation and chloride states were studied, i.e., non-carbonated without chlorides, non-carbonated with chlorides and carbonated with chlorides. Different electrochemical and spectroscopic techniques were used to study the electrochemical properties, the type and the extent of the corrosion products, as well as the type and the extent of the corrosion damage. It was confirmed that the most corrosive environments were pore solutions extracted from the carbonated mortars with chlorides. In this environment the highest corrosion rate was observed for the CEM III pore solution, and the lowest for the CEM I. The extent and the type of corrosion products and the corrosion damage varied according to the environment.

• Language: English
• Keywords: corrosion, blended cements, pore solution, mortar
• Work type: Scientific work
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2019
• Number of pages: Str. 679-686
• Numbering: Letn. 53, št. 5
• PID: 20.500.12556/RUL-114845
• UDC: 620.193:691.714.018.8:666.9.022.6
• ISSN on article: 1580-2949
• DOI: 10.17222/mit.2019.003
• COBISS.SI-ID: 8981345
• Publication date in RUL: 19.03.2020

Record is a part of a journal

• Title: Materiali in tehnologije
• Shortened title: Mater. tehnol.
• Publisher: Inštitut za kovinske materiale in tehnologije
• ISSN: 1580-2949
• COBISS.SI-ID: 106193664

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
• Licensing start date: 19.03.2020

Secondary language

• Language: Slovenian
• Title: Korozijska odpornost jekla v pornih vodah iz mešanih cementov

Abstract

Cementi z mineralnimi dodatki lahko spremenijo strukturo porne vode in posledično vplivajo na korozijske lastnosti jekla. Porne vode so bile iztisnjene in analizirane iz malt, narejenih iz CEM I, CEM II, CEM III in CEM IV cementov. Malte so bile predhodno izpostavljene kloridom ali pospešeni karbonatizaciji v treh kombinacijah: brez karbonatizacije in brez kloridov, brez karbonatizacije s kloridi in v karbonatizaciji s kloridi. Za ugotavljanje korozijskih lastnosti jekla v pornih vodah so bile uporabljene različne elektrokemijske in spektroskopske metode. Analizirane so bile elektrokemijske lastnosti, tip in obseg korozijskih produktov ter tip in obseg korozijskih poškodb. Ugotovljeno je bilo, da najbolj korozivno okolje pripada pornim vodam v karbonatizirani malti s kloridi, kjer je bila najvišja korozijska hitrost izmerjena v pornih vodah iz CEM III cementa, najmanj{a pa iz CEM I cementa. Obseg in tip korozijskih produktov ter poškodb se je razlikoval skladno s korozivnostjo okolja.

• Keywords: korozija, mešanica cementov, porna voda, malta