Journal
CEMENT AND CONCRETE RESEARCH
Volume 128, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2019.105931
Keywords
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Funding
- French Institute for Radiation Protection and Nuclear Safety
- Swiss National Science Foundation (SNSF) [206021_150638/1]
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The incorporation of aluminum in magnesium silicate hydrate (M-S-H) phases was investigated. Magnesium (alumino) silicate hydrate (M-(A-)S-H) with Mg/Si ratios equal to 1.1 or 1.7 and Al/Si ranging from 0 to 0.2 were synthetized in batch experiments and equilibrated at 20, 50 and 70 degrees C. pH values between 9 and 10.5 were observed and aluminum up to Al/Si similar to 0.15-0.18 was incorporated in M-(A-)S-H. Thermogravimetric analysis (TGA), X-ray diffraction (XRD), X-ray pair distribution function (PDF) analysis, transmission electron microscopy (TEM), Si-29 and Al-27 MAS NMR data showed that the M-(A-)S-H phases formed were similar to M-S-H with limited coherent size and a comparable polymerization degree of the tetrahedral silicates. Aluminum was incorporated in both tetrahedral and octahedral sites of MS-H, while no aluminum was present as exchangeable cation on the surface sites.
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