Abstract
The impact of the addition of layered double hydroxides (LDHs) on binding of chloride ions was studied by pore expression experiments. A Mg-Al-NO3 type of LDHs was added to paste samples blended with 3 % NaCl in different proportions (4 % and 10 % by mass of the binder). In addition, the influence of LDHs on the hydration process, morphology and porosity of samples containing Portland cement, calcium sulphoaluminate cement and silica fume was investigated. The potential physical and chemical contributions of LDHs to the system (e.g. AFm formation) were discussed comprehensively. According to the results, addition of LDHs by 10 % could reduce the chloride content in the pore solution by over 25 % and increase the carbonate AFm phases. Moreover, formation of reaction products on the LDH grains was observed. Finally, it was clear that a part of the Cl− ions is bound to the surface of LDHs and can be washed out.
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