Uptake of chloride and carbonate by Mg-Al and Ca-Al layered double hydroxides in simulated pore solutions of alkali-activated slag cement

By Xinyuan Ke, S. A. Bernal, J. Provis. 2017

316 citations recorded by the source corpus.

Chloride ingress and carbonation are major causes of degradation of reinforced concrete. To enable prediction of chloride ingress, and thus to improve the durability of structural alkali-activated slag cement (AAS) based concretes, it is necessary to understand the ionic interactions taking place between chlorides, carbonates, and the individual solid phases which comprise AAS. This study focused on two layered double hydroxides (LDH) representing those typically identified as reaction products in AAS: an Mg-Al hydrotalcite-like phase, and an AFm structure (stratlingite), in simulated AAS pore solutions. Surface adsorption and interlayer ion-exchange of chlorides occurred in both LDH phases; however, chloride uptake in hydrotalcite-group structures is governed by surface adsorption, while stratlingite shows the formation of a hydrocalumite-like phase and ion exchange. For both Ca-Al and Mg-Al LDHs, decreased chloride uptakes were observed from solutions with increased [CO32−]/[OH−] ratios, due to the formation of carbonate-containing hydrotalcite and decomposition of AFm phases, respectively.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/54a2050ed66fd3bc2bc41deb633e4e3773afd642

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In Civil and Structural Engineering

  1. Zuhua Zhang
  2. Liang Shi
  3. Li Yan
  4. Y. Zheng
  5. A. Wang
  6. Kaiwei Liu
  7. Daosheng Sun
  8. J. Provis

In Materials Chemistry

  1. Zuhua Zhang
  2. Liang Shi
  3. Li Yan
  4. Y. Zheng
  5. A. Wang
  6. Kaiwei Liu
  7. Daosheng Sun

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