Tits J Wieland E Müller CJ Landesman C Bradbury MH 2006 In the present study the binding of strontium with pure calcium silicate hydrates (C-S-H) has been investigated using batch-type experiments. Synthetic C-S-H phases with varying CaO:SiO(2) (C:S) mol ratios, relevant to non-degraded and degraded hardened cement paste, were prepared in the absence of alkalis (Na(I), K(I)) and in an alkali-rich artificial cement pore water (ACW). Two types of experimental approaches have been employed, investigating sorption and co-precipitation processes, respectively. The Sr(II) sorption kinetics were determined as well as sorption isotherms, the effect of the solid to liquid ratio and the composition (C:S ratio) of the C-S-H phases. In addition, the reversibility of the Sr(II) sorption was tested. It was shown that both the sorption and co-precipitation tests resulted in Sr(II) distribution ratios which were similar in value, indicating that the same sites are involved in Sr(II) binding. In alkali-free solutions, the Sr(II) uptake by C-S-H phases was described in terms of a Sr(2+)-Ca(2+) ion exchange model. The selectivity coefficient for the Sr(2+)-Ca(2+) exchange was determined to be 1.2+/-0.3. https://sonar.ch/global/documents/239351 eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jcis.2006.03.043 info:eu-repo/semantics/altIdentifier/pmid/16631772 Journal of colloid and interface science. - 2006 Calcium Compounds Environmental Restoration and Remediation Radioactive Pollutants Silicates Strontium Strontium Radioisotopes Strontium binding by calcium silicate hydrates. http://purl.org/coar/resource_type/c_6501