Characterization of the Bonds Developed between Calcium Silicate Hydrate and Polycarboxylate-Based Superplasticizers with Silyl Functionalities
| Autor: | Paulo J.M. Monteiro, Carlos A. Orozco, Guoqing Geng, Byong Wa Chun, Abdul-Hamid M. Emwas |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Cement
Materials science Silylation Coordination number Inorganic chemistry 0211 other engineering and technologies Superplasticizer chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces Calcium 021001 nanoscience & nanotechnology Condensed Matter Physics XANES chemistry.chemical_compound chemistry Rheology 021105 building & construction Electrochemistry General Materials Science Calcium silicate hydrate 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 33(14) |
| ISSN: | 1520-5827 |
| Popis: | Major developments in concrete technology have been achieved with the use of polycarboxylate-based superplasticizers (PCEs) to improve the concrete rheology without increasing the mix water content. Currently, it is possible to control the fluidity of the fresh concrete and obtain stronger and more durable structures. Therefore, there is a strong incentive to understand the interactions between PCEs and cement hydrates at the atomic scale to design new customized functional PCEs according to the ever-increasing requirements of the concrete industry. Here, the bonding types generated between a PCE with silyl functionalities (PCE-Sil) and a synthetic calcium silicate hydrate (C–S–H) are analyzed using XRD, 29Si NMR spectroscopy, and synchrotron-based techniques, such as NEXAFS and EXAFS. The results indicated that the carboxylic groups present in PCE-Sil interact by a ligand-type bond with calcium, which modified not only the symmetry and coordination number of the calcium located at the surface of C–S–H bu... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|