Geopolymer leaching in water and acetic acid
نویسندگان
چکیده
Elemental leaching of metakaolin based geopolymers was investigated by immersing hardened paste specimens in a solution. For this, pure water and 0.1 molar acetic acid solutions were replenished ten times distributed over 56 days total. Dissolution diffusion the elements through from geopolymer into surrounding on cross-sections SEM-EDS microscopy, indentation, X-ray powder diffraction analysis measuring eluted ICP-MS when replenishing solution time. The presented new methodological approach thus combines dissolution rate kinetics obtained via wet chemistry (ICP) with complementary solid state characterisation methods to gain insights complex mechanisms.
 Results indicated relatively small leachability geopolymers, limited only surface layer which is directly exposed aggressive solution, while more inner parts framework remain intact. maps revealed aluminates that occurred across outermost sections, potassium leached out gradually but reached deeper parts. However, there still high portion being left bonded inside geopolymer, even for harsh acidic conditions, diffusion-reaction mechanism took place within geopolymer. experimental results represent first towards feeding reactive transport numerical modeling approaches be developed simulating degradation materials or solutions.
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ژورنال
عنوان ژورنال: RILEM technical letters
سال: 2021
ISSN: ['2518-0231']
DOI: https://doi.org/10.21809/rilemtechlett.2020.124