Aleš Česen (Author), Tadeja Kosec Mikić (Author), Andraž Legat (Author), Violeta Bokan-Bosiljkov (Author)

Abstract

Carbon steel, such as concrete-reinforcing steel, tends to undergo corrosion processes when exposed to certain environmental actions. These are the carbonation of concrete and the ingress of chlorides into the concrete from the environment. Many times, the carbonation and chloride contamination are simultaneous processes leading to a harsh corrosion environment and subsequentcorrosion problems. Monitoring the state of corrosion is thereby a very useful and powerful tool for following and evaluating the lifetime of reinforced concrete structures. Electrochemical measurements were performed toinvestigate different forms of carbon steel in simulated concrete pore waterat different pH values with and without the presence of chlorides. Morphological characteristics of three different types of carbon steel were studied and SEM/EDX and Raman analyses of the corrosion products were performed. It was found that steel in the form of a sheet has a higher corrosion resistivity than a steel wire and a steel rod, and that the steel rod has a higher corrosion resistivity than the steel wire. The corrosion layer on carbon steel is very diverse; several morphologies were found and analyzed. Keywords: carbon steel, metallography, corrosion, concrete pore water

Keywords

carbon steel;metallography;corrosion;concrete;water;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
UDC: 620.193:624.94
COBISS: 2004071 Link will open in a new window
ISSN: 1580-2949
Parent publication: Materiali in tehnologije
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Other data

Secondary language: Slovenian
Secondary title: Korozijske lastnosti različnih oblik jekel v simulirani porni vodi betona
Secondary abstract: Maloogljično jeklo, kot je jeklena betonska armatura, je izpostavljeno korozijskim procesom zaradi vplivov okolja. To sta karbonatizacija betona ter vdor kloridnih ionov iz okolja. Mnogokrat se karbonatizacija in vdor kloridov zgodi istočasno, kar privede do hitrega korozijskega propadanja. Spremljanje korozije na objektih je zato zelo dobro orodje za napoved in oceno preostanka trajnostne dobe nekega objekta. Elektrokemijske preiskave smo izvedli v simulirani raztopini porne vode v betonu pri različnih pH vrednostih ter brez in v prisotnosti kloridnih ionov. Določili smo mikrostrukturne značilnosti posameznih vrst ogljičnih jekel ter morfologijo korozijskih produktov z EDX/SEM-analizo ter Ramansko spektroskopijo. Ugotovili smo, da je najbolj korozijsko odporno ogljično jeklo v obliki folije, sledi palica, najslabše korozijske lastnosti pa ima žica iz ogljičnega jekla. Korozijski produkti na jeklu so različnih morfoloških oblik in sestav. Ključne besede: ogljično jeklo, metalografija, korozija, porna voda betona
Secondary keywords: ogljično jeklo;metalografija;korozija;beton;voda;
URN: URN:NBN:SI:DOC-ADP2XUFD
Pages: str. 51-57
Volume: Letn. 48
Issue: št. 1
Chronology: jan.-feb. 2014
ID: 9093078