Review on corrosion of steel reinforcement in alkali-activated concretes in chloride-containing environments

摘要

Reinforcement corrosion reduces the service life of concrete buildings and infrastructures, resulting in significant worldwide economic losses every year. Alkali-activated materials (AAMs) has been widely considered as a type of greener alternative to Portland cement due to its comparable mechanical proper-ties and much lower energy and resource consumption and emissions. The high alkalinity of pore solu-tion and unique microstructure endow AAM a very promising materials to manufacture structures with high resistance against Cl- penetration. This paper reviews the recent progress of studies on steel corro-sion behavior of alkali-activated concretes (AACs), the transport of chloride and chloride binding in AACs are highlighted. The purpose of this paper is to demonstrate the steel corrosion resistance of AACs con-sidering the chloride penetration process and chloride binding in comparison to Portland cement con-crete, the advantages and disadvantages of AACs are also discussed. (C) 2021 Elsevier Ltd. All rights reserved.