Chloride Induced Corrosion of Steel in Alkali-activated Cements: A Review

Author(s): Shishir Mundra, Susan A. Bernal and John L. Provis
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 172-179
Total Pages: 8
Language : English

Abstract: Alkali-activated materials (AAMs) have significantly different hydration products and pore solution compositions, when compared to Portland cement based concretes. The alkaline nature of the pore solution in both types of cements allows the embedded steel rebar to be protected by a passive film, composed of a complex solid assemblage of iron oxides and hydroxides. The corrosion of the steel rebar is one of the primary reasons for the premature failure of reinforced concrete structures, and corrosion of the rebar is primarily driven either by the lowering of pH of the pore solution (leaching of alkalis, carbonation) or by the presence of chlorides above a threshold concentration at the steel-concrete interface. This paper presents an overview of the factors that influence the service life of mild steel reinforced AAMs in chloride rich environments: the hydration product chemistry, type of precursor, alkali-activator, the pore structure, and pore solution chemistry, the effect of chloride binding, and the corrosion of the steel reinforcement.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00