Chloride transport and the resulting corrosion of steel bars in alkali activated slag concretes
By Qianmin Ma, S. Nanukuttan, P. Basheer, Yun Bai, Chang-Hui Yang. 2016
152 citations recorded by the source corpus.
Abstract As the relative performance of alkali activated slag (AAS) concretes in comparison to portland cement (PC) counterparts for chloride transport and resulting corrosion of steel bars is not clear, an investigation was carried out and the results are reported in this paper. The effect of alkali concentration and modulus of sodium silicate solution used in AAS was studied. Chloride transport and corrosion properties were assessed with the help of electrical resistivity, non-steady state chloride diffusivity, onset of corrosion, rate of corrosion and pore solution chemistry. It was found that: (i) although chloride content at surface was higher for the AAS concretes, they had lower chloride diffusivity than PC concrete; (ii) pore structure, ionic exchange and interaction effect of hydrates strongly influenced the chloride transport in the AAS concretes; (iii) steel corrosion resistance of the AAS concretes was comparable to that of PC concrete under intermittent chloride ponding regime, with the exception of 6 % Na2O and Ms of 1.5; (iv) the corrosion behaviour of the AAS concretes was significantly influenced by ionic exchange, carbonation and sulphide concentration; (v) the increase of alkali concentration of the activator generally increased the resistance of AAS concretes to chloride transport and reduced its resulting corrosion, and a value of 1.5 was found to be an optimum modulus for the activator for improving the chloride transport and the corrosion resistance.
Subfields: Civil and Structural Engineering
View Paper: https://www.semanticscholar.org/paper/974fa9a5db60e6e6b3555eac431dd53b45a7dd83
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In Civil and Structural Engineering
Citations in the corpus
- The Durability of Alkali-Activated Materials in Comparison with Ordinary Portland Cements and Concretes: A Review (2020, background): “Content of alkali Very complex; no obvious trend [140,143,144]”
- The effect of the steel–concrete interface on chloride-induced corrosion initiation in concrete: a critical review by RILEM TC 262-SCI (2019, background): “In the case of alkali-activated BFS, several studies have reported reducing conditions at the SCI due to the presence of sulfides in the pore solution [78, 79], which is claimed to influence, at least for some time, the corrosion performance [80, 81].”
- Uptake of chloride and carbonate by Mg-Al and Ca-Al layered double hydroxides in simulated pore solutions of alkali-activated slag cement (2017, background): “The potentially high chloride binding capacity of the AAS cement binder postulated in some studies might also contribute to the higher resistance to chloride ingress [5,6], and this is the core question to be examined in the current study.”