Factors affecting the corrosion rate of steel in carbonated mortars

Glass, Gareth K.; Page, Christopher; Short, N. R.

doi:10.1016/0010-938x(91)90048-t

Cited by 237 publications

(109 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…12) with i corr reaching values of the order of 100 mA/m 2 when E corr approached À600 mV. This behaviour can be explained by an ohmic control of the corrosion process and it is consistent with the anodic-resistive control proposed by Glass et al [31]. It should, however, be observed that the corrosion potential values measured in this study on the steel bars in dry carbonated mortars are lower than those usually measured on steel bars embedded in carbonated concrete (were usually higher values higher than À200 mV vs SCE are measured [2]) and this aspect needs to be further investigated.…”

Section: Bindersupporting

confidence: 84%

Corrosion behaviour of metal inserts in simulated ancient masonry mortars

Carsana

Marra

Bertolini

2015

Construction and Building Materials

View full text Add to dashboard Cite

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.

show abstract

Section: Bindersupporting

confidence: 84%

Corrosion behaviour of metal inserts in simulated ancient masonry mortars

Carsana

Marra

Bertolini

2015

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…The moisture retained within the pores may enhance the carbonation process. Glass et al,17 indicate that low levels of chloride contamination increase the ionic conductivity, whereas higher levels favour moisture rentention.…”

Section: Discussionmentioning

confidence: 99%

Changes in the phase composition in OPC and blended cement mortars due to carbonation

Maslehuddin¹,

Shirokoff²,

Siddiqui³

1996

Advances in Cement Research

View full text Add to dashboard Cite

show abstract

“…Recently, there have been attempts to measure the concentration of chloride ions using various types of sensors, and the penetration behavior of chloride ions in mortar has also been studied. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] On the other hand, electrochemical techniques are used in analysis of corrosion of reinforcing steel in mortar. Electrochemical Impedance Spectroscopy (EIS) has attracted attention in this connection in recent years.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Environmental Factors and Corrosion Analysis of Reinforcing Steel in Mortar

Vedarajan

Nishimura

2009

Mater. Trans.

View full text Add to dashboard Cite

To understand environmental factors in mortar, the Cl ion concentration and pH were monitored by inserting microelectrodes into artificial pores in the mortar. At the same time, the corrosion behavior of the reinforcing steel was investigated by EIS. In the EIS measurements of the reinforcing steel, Warburg impedance by diffusion was confirmed in the initial period, but it could no longer be observed after 35 days. In comparison with a 10 mm cover thickness, a 20 mm cover thickness showed a higher impedance behavior. The Cl ion concentration in the mortar was obtained using Ag/AgCl microelectrodes, showing that this behavior is generally controlled by diffusion. When the diffusion equation was used in this work, the diffusion coefficient (D c ) showed a high value of D c ¼ 2 Â 10 À4 mm 2 /s. Similarly, the pH in the mortar was obtained using W/WO x microelectrodes. With a 20 mm cover thickness, pH was limited to approximately pH 11, but with a 10 mm cover thickness, pH continued to decrease to around pH 9.5. The latter phenomenon was considered to be the result of neutralization by penetration of the immersion solution from the surface. Based on the results of monitoring with the microelectrodes, solutions simulating those in the pores in mortar were prepared and used in EIS measurements. The charge transfer resistance R ct in the simulated solutions showed good correspondence with the impedance (Z 2mHz ) in the low frequency region (2 mHz) in the actual mortar. This is attributed to the fact that the corrosion of reinforcing steel was controlled by the solution conditions (mainly Cl concentration and pH) in the pores in mortar. If these solution conditions (Cl concentration, pH) exceed threshold values, it was found that the passivation film is destroyed, resulting in high corrosion.

show abstract

Factors affecting the corrosion rate of steel in carbonated mortars

Cited by 237 publications

References 9 publications

Corrosion behaviour of metal inserts in simulated ancient masonry mortars

Corrosion behaviour of metal inserts in simulated ancient masonry mortars

Changes in the phase composition in OPC and blended cement mortars due to carbonation

Monitoring of Environmental Factors and Corrosion Analysis of Reinforcing Steel in Mortar

Contact Info

Product

Resources

About