Study of reinforced concrete slabs after three years of cathodic protection under severe conditions

Abstract

R E S U M i ~The objective of this study is to determine the influence of cathodic protection on the properties of concrete cover in concrete slabs. To accelerate deterioration, the slabs were subjected to freezing and thawing cycles and sprayed with sodium chloride solution. Cathodic protection was applied to the reinforcements for three years. Then, the test pieces underwent physico-chemical analysis. Scanning electron microscopy and X-ray spectrometry were used to study the reinforcement-concrete interface, in particular for detecting alkali-silica reaction due to the alkalization. Carbonation depths, chloride penetration profiles and examinations of the reinforcements showed the good condition of the concrete cover and the beneficial effect of the cathodic protection of embedded steel.

Chloride ingress in concrete: limestone addition effects

“…& Portland composite cement mixes consisted of ternary or quaternary blends of PC, LS and other supplementary cementitious materials, such as GGBS, FA, SF and MK. In total, 31 studies using composite cement mixtures were sourced (Abd-El-Aziz and Heikal, 2009;Alonso et al, 2012;Attari et al, 2012;Badogiannis et al, 2015;Bentz et al, 2013;Bjegovic et al, 2012;Chaussadent et al, 1997;Dave et al, 2016;Dogan and Ozkul, 2015;Ekolu and Murugan, 2012;Güneyisi et al, 2005Güneyisi et al, , 2006Güneyisi et al, , 2007Holt et al, 2009Holt et al, , 2010Hu and Li, 2014;Kathirvel et al, 2013;Katsioti et al, 2008;Lang, 2005 Pipilikaki and Katsioti, 2009;Shao-li et al, 2015;Siad et al, 2015;Sideris and Anagnostopoulos, 2013;Tanesi et al, 2013;Thomas et al, 2012;Villagrán Zaccardi et al, 2010. However, the results of these works could not be used in this study because the sole effect of LS could not be clearly identified.…”