Ionic complexation and adsorption of small organic molecules on calcium silicate hydrate: Relation with their retarding effect on the hydration of C3S
| Autor: | Camille Nalet, André Nonat |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Metal ions in aqueous solution Inorganic chemistry 0211 other engineering and technologies Ionic bonding chemistry.chemical_element 02 engineering and technology Building and Construction engineering.material Calcium 021001 nanoscience & nanotechnology Silicate Portlandite chemistry.chemical_compound Adsorption 021105 building & construction engineering Hydroxide General Materials Science Calcium silicate hydrate 0210 nano-technology |
| Zdroj: | Cement and Concrete Research. 89:97-108 |
| ISSN: | 0008-8846 |
| Popis: | The ion complexing power and the adsorption of set-retarders such as sugar derivatives ( d -glucitol, d -gluconate…), amino-carboxylates and phosphonates (EDTA, EDTMP, …) on C-S-H were identified and compared. The complexation equilibria of the predominant calcium and/or hydroxide complex and its relative constant were determined after measuring the solubilizing effect of the molecules in suspensions buffered by portlandite. The adsorption of the molecules on C-S-H as well as their possible complexation with silicate ions in solution were also investigated. All the molecules studied are shown to complex calcium and/or hydroxide ions but only amino-phosphonates, d -gluconate and d -glucitol complex silicate ions. They all adsorb on portlandite and C-S-H but to different extents. These organic compounds are also revealed to be sensitive to the presence of calcium counter-ions at the surface of C-S-H. Finally, the relation between their ionic complexing powers, adsorption properties and retarding effects on the hydration of C 3 S are discussed. |
| Databáze: | OpenAIRE |
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