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Monday, 16 September 2019
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Raw materials & technologies, Technologies

Corrosion performance of blended cement concrete in marine environment

Monday, 14 August 2017

Blended cement is widely used in critical structures mainly because of its enhanced corrosion resistance. But how does the material behave in marine environment? This has been investigated in a long-term study by Indian researchers.

Corrosion performance of blended cement concrete in marine environment. Source: Pixabay

Corrosion performance of blended cement concrete in marine environment. Source: Pixabay

The paper presents the long term corrosion performance of Portland pozzolana cement (PPC) and Portland slag cement (PSC) concrete under the three marine exposure conditions atmospheric zone (AZ), immersion zone (IZ) and splash zone (SZ). As exposure station the Offshore Platform Marine Electrochemistry Center (OPMEC) in Tuticorin, India, was selected.

Comparison with OPC concrete

The concrete cubes were exposed over the period of 10 years and their physicochemical properties such as compressive strength, alkalinity, free chloride content and sulphate content, bio-fouling attachment and electrochemical properties like, AC-impedance and potentiodynamic polarization were carried out and the results obtained were compared with Ordinary Portland Cement (OPC) concrete.

Higher corrosion resistance

It was observed that strength and alkalinity of the blended cement concretes were relatively equal to that of OPC concrete. In addition, the pH values of the blended cement concretes are above the threshold limit recommended for depassivation. The resistance to chloride ion penetration was significantly reduced for blended cement concretes and also exhibited very high amount of bio-fouling attachment. The electrochemical studies revealed that the blended cement concretes are having higher corrosion resistance in all three exposure zones. From the results it is observed that the blended cement concretes are highly recommended for aggressive marine environments rather than OPC concrete.

The study is published in: Construction and Building Materials, Volume 154, 15 November 2017, Pages 349-360

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