Article / članak 20

Influence of airborne chlorides on concrete durability in the marine environment

Utjecaj klorida iz zraka na trajnost betona u morskom okolišu

authors / autori
Dora Kolman, izv. prof. dr. sc. Ivan Gabrijel

DOI
https://doi.org/10.5592/CO/PhDSym.2022.20

keywords / ključne riječi
corrosion, marine atmosphere, environmental conditions, airborne chlorides, wet candle method
korozija, morska atmosfera, okolišni uvjeti, kloridi iz zraka, wet candle metoda

page range in publication / raspon stanica
247 → 254

publish date / datum publikacije
9/4/2020

abstract / sažetak
The main driver of corrosion of concrete reinforcement in the marine environment is the penetration of chlorides into the parts of the concrete in contact with seawater, but insufficient attention is paid to the corrosivity of the marine atmosphere. Research shows that there is a large interaction between the marine atmosphere and concrete. Airborne chlorides are defined as chloride-containing seawater particles in the air that are formed by breaking waves against an obstacle or are lifted from the seawater surface and carried by the wind over long distances. Airborne chlorides accumulate on the concrete surface and potentially penetrate into it, thus contributing to the content of already accumulated chlorides. Quantification of the rate of airborne chlorides accumulation and the penetration of chlorides into the concrete exposed to the marine atmosphere provides an additional basis for planning the service life of reinforced concrete structures in the marine environment. This paper presents an overview of the wet candle method for determining the content of airborne chlorides and presents suggestions for further research in this area.
Glavni pokretač korozije armature betona u morskom okolišu je prodiranje klorida u dijelove betona koji su u kontaktu s morskom vodom, no nedovoljna se pozornost pridaje korozivnosti morske atmosfere. Istraživanja pokazuju da postoji velika interakcija između morske atmosfere i betona. Kloridi u zraku definiraju se kao čestice morske vode u zraku koje sadrže kloride, a nastaju razbijanjem valova o prepreku ili su dignute s površine morske vode i nošene vjetrom na veće udaljenosti. Kloridi iz zraka se nakupljaju na površini betona i potencijalno prodiru u isti, doprinoseći tako sadržaju već akumuliranih klorida. Kvantifikacija brzine nakupljanja klorida iz zraka i prodora klorida u beton izložen morskoj atmosferi pruža dodatnu podlogu za planiranje životnog vijeka armiranobetonskih konstrukcija u morskom okolišu. Ovim je radom dan pregled wet candle metode za određivanje sadržaja klorida u zraku, te su izneseni prijedlozi za daljnja istraživanja u ovom području.