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Carbonation-induced corrosion of alkali-activated binary concrete based on natural volcanic pozzolan

2019; Elsevier BV; Volume: 232; Linguagem: Inglês

10.1016/j.conbuildmat.2019.117189

1879-0526

Rafael Robayo–Salazar, Ana María Aguirre-Guerrero, Ruby Mejía de Gutiérrez,

Magnesium Oxide Properties and Applications

The alkali-activated concretes have been attractive as an alternative material to Portland cement-based concrete (OPC), due to their low environmental impact and the good mechanical properties, however, regarding durability exist uncertainties. This article studies the performance to carbonation induced corrosion of the reinforcing steel embedded in an alkali-activated binary concrete (AABC) based on NP (70% by mass) and GBFS (30% by mass). According to the results, AABC has a better carbonation performance than OPC under natural and accelerated exposures (25 °C, 65% HR, 1% CO2). The structural steels embedded in AABC after the exposure to accelerated carbonation remained in a passive state up to 360 days.