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HomeKey Engineering MaterialsKey Engineering Materials Vol. 650A Study of Natural Pozzolan Mortars Exposed to...

A Study of Natural Pozzolan Mortars Exposed to Chlorides as a Sustainable Building Material

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Abstract:

Reinforcement corrosion is caused either by chloride ions or carbonation, although chloride-induced reinforcement corrosion is the most widespread and serious problem. Moreover, the use of supplementary cementitious materials has been proposed in order to mitigate the durability problem, reduce the production costs and control the emission of greenhouse gases (GHGs). This paper reports the results of a study conducted to investigate the influence of Algerian natural pozzolan on reinforcement corrosion in blended cement mortars exposed to chlorides. Compositions, with replacement levels of 0, 10, 20 and 30% of normal Portland cement by mass of cement by natural pozzolan, were investigated. The exposure solution contained a fixed concentration of 5% sodium chloride. The compressive strength, corrosion potential, corrosion current density, sorptivity, rapid chloride ion penetration, in accordance with the standard ASTM C1202-12, were determined in order to characterize the mechanical and electrochemical behavior of the mortars. It was found that the use of natural pozzolan had resulted in a significant decrease in the corrosion rate of rebars, better mechanical performances and also a resistance to penetration of chlorides ions.

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Periodical:

Key Engineering Materials (Volume 650)

Pages:

105-113

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.650.105

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Online since:

July 2015

Authors:

Laïd Laoufi, Mohamed Mouli, Yassine Senhadji

Keywords:

Aggressive Solution, Corrosion, Durability, Natural Pozzolan, Sustainable Material

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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