Corrosion products and corrosion-induced cracks of low-alloy steel and low-carbon steel in concrete. (April 2018)

• Record Type: Journal Article
• Authors: Shi, Jinjie; Ming, Jing; Zhang, Yamei; Jiang, Jinyang
• Is Part Of: Cement & concrete composites. Volume 88(2018)
• Page Start: 121
• Page End: 129
• Publication Date: 2018-04
• Subjects: Low-alloy steel -- Corrosion products -- Cracks -- Concrete -- X-ray computed tomography; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2018.02.002
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: The distribution of corrosion products at the steel-concrete interface and the pattern of corrosion-induced cracks were characterized using X-ray computed tomography (X-CT) and environmental scanning electron microscopy (ESEM). A novel low-alloy reinforcing steel (LA steel) and the conventional low-carbon reinforcing steel (LC steel) embedded in concrete were subjected to impressed current accelerated corrosion. The results of Raman spectroscopy showed that non-protective lepidocrocite (γ-FeOOH) was the main corrosion products for LC steel, while stable and protective maghemite (γ-Fe2 O3 ) and less crystallized feroxyhite (δ-FeOOH) and ferrihydrite (5Fe2 O3 ·9H2 O) were identified in the Cr-enriched inner rust layer of LA steel.