Environmental Factors Affecting Corrosion of Steel Inserts in Ancient Masonry

Bertolini, Luca; Carsana, Maddalena; Daniotti, Bruno; Marra, Eleonora

doi:10.1007/978-3-642-37475-3_9

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…3), containing two bars (6 mm in diameter) of carbon steel (cover depth was 12 mm). A low carbon steel [8] with ferritic microstructure was used in order to simulate common ancient steels [7,17,18]. Specimens with stainless steel AISI 304L and titanium smooth bars were also prepared to test the corrosion behaviour of these metals often used in restoration works.…”

Section: Experimental Studymentioning

confidence: 99%

“…Although most of the fractured surface was carbonated, the presence of the so called Liesegang Patterns [24], i.e. traces of still alkaline material in form of pink coloured strips in the fractured surface, was detected with the phenolphthalein test [8]. Indeed, from pH measurements on the powder collected from the specimens, it was observed that the pH of the pore solution had values of 9.9 and 11.6 respectively for LCP and LG samples, respectively, showing the presence of residues of non-carbonated calcium hydroxide.…”

Section: Effect Of Bindermentioning

confidence: 99%

“…improving the structural behaviour of buildings (chains and ties) or preventing the propagation of cracks, and they may be applied externally or embedded in the materials of the masonry (mortar, bricks, stone blocks, etc.). In the latter case, the presence of these inserts may be harmful for the durability of masonry, since their corrosion may produce deleterious expansive phenomena leading to the failure of the brittle porous materials in which they are embedded [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion behaviour of metal inserts in simulated ancient masonry mortars

Carsana

Marra

Bertolini

2015

Construction and Building Materials

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h i g h l i g h t sCorrosion of metal inserts in aerial and hydraulic mortars was studied. Carbon steel, stainless steel and titanium inserts were considered. Mortar composition had a secondary effect on the corrosion rate compared to the role of moisture. High corrosion rate was measured only for carbon steel in mortars exposed to 95% RH or water suction. Mortar resistivity was found to be a reliable parameter to assess corrosion of embedded inserts. a r t i c l e i n f o b s t r a c tCorrosion of metal inserts may be detrimental to the durability of masonry. The paper discusses corrosion of carbon steel, stainless steel and titanium embedded in aerial and hydraulic mortars simulating those of ancient walls. The effects of temperature (5-40°C), moisture (65-95% RH and water suction) and electrical resistivity of mortars on the corrosion of metal inserts are discussed. Results showed that the corrosion rate of embedded steel, regardless of the mortar composition, is negligible in mortars exposed to 65-80% RH (even at 40°C) and modest even at 95% RH, while high values were obtained in the presence of water uptake.

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Section: Experimental Studymentioning

confidence: 99%

Section: Effect Of Bindermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion behaviour of metal inserts in simulated ancient masonry mortars

Carsana

Marra

Bertolini

2015

Construction and Building Materials

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“…According to Figueiredo [4], the corrosion deals with the degradation of materials by the chemical or electrochemical action of the environment into which the structure is located. That is, when the local atmosphere is ranked as aggressive, the reinforcement corrosion becomes especially worrisome, because the conditions are conducive to the ingress of contaminated fluids through the pores of the concrete cover [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of migrating inhibitor concentration on corrosion resistance of steel reinforcement in concrete

Theiss,

Effting,

Schackow

2023

ECUM

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To increase the service life and durability of reinforced concrete structures, new technologies have been developed, such as cathodic protection, re-alkalinization, chloride extraction, and the use of corrosion inhibitors. This study evaluated the influence of cement type, concrete cover thickness, and the addition of organic migrating corrosion inhibitor (MCI) on the corrosion resistance of the embedded steel in concrete against the induced action of chloride ions. To accomplish this, corrosion tests were carried out using electrode potential techniques simultaneously with acceleration cycles of chloride attack. Four mixtures with two levels of reinforcement cover (25 and 40 mm) were subjected to 30 weekly cycles of chemical attack: a reference mixture (without inhibitor) and three others adopting concentration levels of 0.30%, 0.45%, and 0.60% of MCI in the volume of concrete. The concrete properties (compressive strength, voids, specific gravity, and water absorption by immersion and capillarity) were verified. In the corrosion tests on reinforced concrete with lower cover thickness, the mixture with 0.60% MCI addition showed the best results: corrosion potential values less negative than -200 mV, with less than 10% probability of corrosion.

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Feuchteschutz von Mauerwerk durch hygrothermische Simulation

Künzel

2013

Mauerwerk‐Kalender 2013

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Environmental Factors Affecting Corrosion of Steel Inserts in Ancient Masonry

Cited by 5 publications

References 5 publications

Corrosion behaviour of metal inserts in simulated ancient masonry mortars

Corrosion behaviour of metal inserts in simulated ancient masonry mortars

Influence of migrating inhibitor concentration on corrosion resistance of steel reinforcement in concrete

Feuchteschutz von Mauerwerk durch hygrothermische Simulation

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