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
- Universidad del Valle (Cali, Colombia)
- Ministry of Science, Technology, and Innovation (COLCIENCIAS-MINCIENCIAS) [848]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据