Titlebook: Nuclear Magnetic Resonance Spectroscopy of Cement-Based Materials; Pierre Colombet,Hélène Zanni,Piero Sozzani Conference proceedings 1998

Munificent

四牛在弯曲

New Progress in High Resolution 27Al and 17O Solid State NMR (MAS and MQ-MAS) of Aluminium Bearing Puadrupolar nuclei such as .Al or .O gives increased resolution in describing the local structure of crystalline or amorphous materials. This is especially the case for .Al in aluminium bearing phases of cement interest. This contribution rapidly describes the different high resolution techniques, th

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Time Resolved Very High Temperature NMR Study of the Cooling Process of CaO-Al2O3 Liquidslids but also to characterize the average structure and the dynamics of aluminum bearing liquids at very high temperature (T>2000 C). From time resolved very high temperature NMR measurements performed during the cooling of a calcium aluminate liquid levitated droplet, .Al relaxation time and chemic

fluoroscopy

Absenteeism

The Structure of Calcium Silicate Hydrate: NMR and Raman Spectroscopic Resultssults can be interpreted to indicate that the single phase samples we examined have structures based on that of tobermorite, and that the observed compositional dependence of the structure can be explained by a defect tobermorite model.

STERN

29Si MAS NMR Spectroscopy of Poorly-Crystalline Calcium Silicate Hydrates (C-S-H)Decreasing C/S ratios reduces the intensity of the Q. signal (−79 ppm), shifts the position of the Q. signal from −84.2 ppm to −85.6 ppm and produces an additional signal at −82.5 ppm. The signals at −85.6 ppm and −82.5 ppm are assigned to paired Q. and bridging Q. with OH. A C-S-H phase with C/S ra

constitute

母猪

Structural Investigation of Calcium Silicate Hydrates by X-Ray Absorption Spectroscopy hydrates (xonotlite, tobermorite 14Å, hillebrandite, and C-S-H). The data given by extended X-ray analysis fine structure spectroscopy (EXAFS) are in good agreement with XRD data, except for tobermorite. The EXAFS spectrum of tobermorite is very similar to that of C-S-H. In both cases, an EXAFS fit

certitude

invade

The Structure, Stoichiometry and Properties of C-S-H Prepared by C3S Hydration Under Controlled Condrent values of [CaO] ranging between 6.5 and 30 mmol/1 show that the lime concentration in solution is the parameter which determines the main characteristics of the reaction and products. The stoichiometry of C.S hydration products vanes with lime concentration in the same way as synthetic C-S-H un