Inhaltszusammenfassung

Solid-state nuclear magnetic resonance spectroscopy (ssNMR) is an advanced applied additional fundamental analytical method for analysing hydrate phases in cement based systems. Since the hydration of CACs often results in the formation of X-ray amorphous structures, which can only can be detected to a limited extent by X-ray powder diffraction (PXRD), ssNMR is an essential fundamental additional analytical tool. This study investigates the hydration behaviour and hydrate phase formation of ...Solid-state nuclear magnetic resonance spectroscopy (ssNMR) is an advanced applied additional fundamental analytical method for analysing hydrate phases in cement based systems. Since the hydration of CACs often results in the formation of X-ray amorphous structures, which can only can be detected to a limited extent by X-ray powder diffraction (PXRD), ssNMR is an essential fundamental additional analytical tool. This study investigates the hydration behaviour and hydrate phase formation of calcium aluminate cements (CACs), including Istra 45, Secar 51, Secar 71 and Secar 80. The hydration times of these cements were determined using simultaneous thermal analysis (STA), with the samples being hydrated in a climatic chamber and then vacuum freeze-dried. For phase identification PXRD, Rietveld refinement and ssNMR were applied. The PXRD analysis revealed typical C-A-H phases for CACs as also well as silicon-containing C A S-H and C-S-H phases in Istra 45 and Secar 51. Solid-state NMR spectroscopy provided additional insights into the structure of the hydrate phases and their development over different hydration times. » weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Materialwissenschaft

DDC Sachgruppe:
Ingenieurwissenschaften