A Study of Natural Pozzolan Mortars Exposed to Sulfate as Energy Efficient Building Material

Abstract:

Reinforcement corrosion is one of the main causes of concrete deterioration. The steel in concrete is naturally protected from corrosion by the presence of a passive film formed through the high alkalinity of concrete. A technique to improve the protection of steel in concrete is the inclusion of mineral additions. Natural pozzolan (NP) from Beni-Saf is a mineral addition that is abundant in western Algeria. The experiment was conducted on mortar specimens, containing steel bars and exposed to the aggressive solutions of Na₂SO₄ and MgSO₄. The status of reinforcement is periodically monitored by measuring the electrochemical potentials and the corrosion rates by the technique of linear polarization resistance (LPR) and also the thermal conductivity was evaluated. The test results show that natural pozzolan significantly affects the physical properties of mortars, improves the corrosion resistance of mortars containing up to 20% of natural pozzolan and reduces the thermal conductivity.

• Periodical: Key Engineering Materials (Volume 678)
• Pages: 109-122
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.678.109
• Online since: February 2016
• Authors: Laïd Laoufi*, Yassine Senhadji, A.S. Benosman
• Keywords: Aggressive Environments, Corrosion, Electrochemistry, Mortar, Natural Pozzolan, Sustainability

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