Corrosion and Chloride Diffusivity of Reinforced Concrete Cracked under Sustained Flexure

Abstract

This research discusses the chloride diffusivity of concrete as well as corrosion performance of rebars in cracked and uncracked states. Prismatic concrete specimens with two water-tocement ratios, two concrete cover thicknesses with and without steel fibers were used. Threepoint flexural loading was applied to form cracks and cracks were sustained by a bolt system. Half-cell potential and corrosion rate measurements were carried out following wettingdrying cycles in chloride environment which were continued for 80 weeks. The positive effects of lower water-to-cement ratio and greater cover depth were found to be surpassed by existence of cracks in concrete.

Durability Aspects of Concrete Containing Nano- Titanium Dioxide

“…60 This is because the distance between nanoparticles decreases as the nanoparticle content increases, and the Ca(OH) 2 crystal quantity decreases as a result. 61 This results in a low ratio of crystal to strengthening gel, increased shrinkage and creep of the cement matrix, and a looser pore structure of the cement matrix, which could result in increased chloride penetration. 51 Figure 8 shows the percentage of chloride penetration at different average depths of the concrete samples.…”

Corrosion Rate-Based Adjustment of Plastic Hinge Parameters of Corroded RC Elements

“…In practice, the corrosion level can be obtained by measurement of the residual diameter d c or by means of techniques that correlate the width of external cracks with the reduction of the cross-section of the reinforcement bar [25][26][27][28].…”

Predicting the life cycle durability and ecological performance of cementitious coatings with a fuzzy‐stochastics–based approach

“…The first step of fuzzification involves the sampling of objective test data. The experimentally obtained age factor and the mean of initial chloride diffusion coefficient of uncracked (Chen et al., 2021; Ding et al., 2021; Dousti et al., 2013; Frederiksen et al., 1997; Hu & Xia, 2022; Jasielec et al., 2020; Leng et al., 2000; Lin & Yang, 2019; Lin et al., 2013; Liu et al., 2015; McNally & Sheils, 2012; Nguyen et al., 2009; Oh & Jang, 2004; Paul et al., 2016; Sahmaran et al., 2007; Sahmaran & Li, 2009; Si & Feng, 2018; Sun et al., 2020; Tian et al., 2020; Xu & Cai, 2010; Zhang & Kong, 2010; Zhang et al., 2018, 2021; Zhao et al., 2020) and cracked (Hu, 2021; Kwon et al., 2009; Lee et al., 2014; Lu et al., 2014; Mu et al., 2013; Ozyurt et al., 2020; Paul et al., 2016; Rodriguez & Hooton, 2003; Sahmaran et al., 2007; Wang et al., 2016; Zha, 2016) cementitious materials are summarized in Appendices A and B, respectively.…”