2021/11/09 by Lina Bouzouaid, Barbara Lothenbach, Bouzouaid, Lina +5
Engineering · Environmental Science · Materials Science · #CO2 Sequestration and Geologic Interactions #Calcium Carbonate Crystallization and Inhibition #Chemical Physics (physics.chem-ph) #Concrete and Cement Materials Research #FOS: Physical sciences
paper · doi:10.48550/arxiv.2111.05152
openalex publication_date 2021/11/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
This study investigates the effect of gluconate, a carboxylate ion, and three uncharged hexitols, D-sorbitol, D-mannitol and D-galactitol on the solubility of C-S-H. Thermodynamic modeling was used to determine the kind and amount of Ca-organic-silicate-OH complexes that potentially form in the conditions studied. All the organics form complexes with calcium and hydroxide, In addition, heteropolynuclear organics complexes with calcium, hydroxide and silicate are observed at high pH values and high calcium concentrations with the exception of mannitol. The strength of complexation with silicate decreases from gluconate > sorbitol > galactitol. The adsorption of the selected organics on portlandite and C-S-H systems follows the order gluconate >> sorbitol > mannitol = galactitol. For C-S-H system buffered with Ca(OH)2, a typical Langmuir isotherm was found and adsorption on C-S-H increased with the Ca/Si ratio as well as with the increase of the organic concentration.