4.6 Article

Assessment of the Corrosion of Steel Embedded in an Alkali-Activated Hybrid Concrete Exposed to Chlorides

期刊

MOLECULES
卷 27, 期 16, 页码 -

出版社

MDPI
DOI: 10.3390/molecules27165296

关键词

hybrid alkali-activated cements; fly ash; granulated blast furnace slag; reinforced concretes; corrosion; chloride ions

资金

  1. Universidad del Valle (Cali, Colombia)
  2. Ministry of Science, Technology, and Innovation (COLCIENCIAS-MINCIENCIAS) [848]

向作者/读者索取更多资源

Hybrid alkali-activated cements are alternative cements that combine the advantages of ordinary Portland cement and alkali-activated systems. This article evaluates the corrosion performance of reinforced HAAC concrete based on fly ash under exposure to chlorides, comparing it with a binary alkali-activated cement based on fly ash and granulated blast furnace slag. The tests show that the HAAC concrete exhibits better corrosion performance, with a lower corrosion rate compared to the binary cement.
Hybrid alkali-activated cements (HAACs), also known as cements with high percentages of alkali-activated supplementary materials, are alternative cements that combine the advantages of ordinary Portland cement (OPC) and alkali-activated systems. These cements are composed of a minimum of 70% precursor material and a maximum of 30% OPC mixed with an alkaline activator. This article evaluates the corrosion performance of reinforced HAAC concrete based on fly ash (FA) under exposure to chlorides (FA/OPC, 80/20). Its performance is compared with that of a binary alkali-activated cement (AAC) based on FA and granulated blast furnace slag (GBFS) (FA/GBFS, 80/20). The tests performed on the concrete matrix correspond to the compressive strength and permeability to chloride ions. Using accelerated corrosion techniques (impressed voltage) and electrochemical tests after immersion in 3.5% NaCl, the progress of the corrosive process in the reinforcing steel is evaluated. The FA/OPC exhibit a better corrosion performance than the FA/GBFS concrete. At the end of the exposure to chlorides, the FA/OPC hybrid concrete presents the best performance, with a 49% lower corrosion rate than that of the FA/GBFS. Note that according to the polarization curves, the values of the proportionality constant B in the alkaline-activated concretes differ from the values recommended for concrete based on OPC.

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