TY - CONF A1 - Ramirez Caro, Alejandra A1 - Pauli, Jutta A1 - Artemeva, Elena A1 - Ermilov, Eugeny A1 - Crasselt, Claudia A1 - Stroh, Julia A1 - Mota Gasso, Berta A1 - Schmidt, Wolfram A1 - Resch-Genger, Ute T1 - Study of the hydration of superplasticizer-cement pastes with optical spectroscopy N2 - Chemical admixtures like superplasticizers or stabilizing agents are of ever increasing importance for modern concrete technology. Although such admixtures have meanwhile become common practice in many applications of concrete technology, the understanding of these highly complex systems is still limited and the relevant parameters, which predominantly control the interaction between the superplasticizer and the cement components, have not been identified yet. Optical methods have been successfully used for the analysis and monitoring of the interactions between a broad variety of nanoscale and molecular systems like nanoparticles of various chemical composition and different types of organic ligands or biomolecules. This encouraged us to assess the potential of these methods, and particularly reflectance and fluorescence measurements, for the study of the interactions that occur at the interface between particle or hydrate surfaces and the fluid phase at a very early stage of concrete formation. Special emphasis is dedicated to search for and identify differences between commonly used superplasticizers. Here, we focus on hydration effects using commercial comb shape polycarboxylate ethers (PCEs) with different charge densities, which are known to allow a very low water/cement ratio (w/c of 0.20 or less) while maintaining good workability. Based upon changes of the intensity of the reflectance and fluorescence signal and spectral effects of a dye, acting as optical reporter, a model for the interactions of dye, PCE molecules and cement nanoparticles in the very first phase of cement hydration is derived T2 - Gesellschaft Deutscher Chemiker-Analytische Chemie-Anakon 2017 CY - Tübingen, Germany DA - 03.04.2017 KW - Cement hydration KW - Optical spectroscopy KW - Superplasticizers PY - 2017 AN - OPUS4-39882 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -