The effect of silica fume on early hydration of white Portland cement via fast field cycling-NMR relaxometry

2017 ◽  
Author(s):  
Codruţa Badea ◽  
Andrea Bede ◽  
Ioan Ardelean
Keyword(s):  
Portland Cement ◽  
Silica Fume ◽  
Early Hydration ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Fast Field ◽  
White Portland Cement

The Effect of Curing Temperature on Early Hydration of Gray Cement Via Fast Field Cycling-NMR Relaxometry

2014 ◽  
Vol 45 (12) ◽  
pp. 1299-1309 ◽  
Author(s):  
Codruta Badea ◽  
Alexandra Pop ◽  
Carlos Mattea ◽  
Siegfried Stapf ◽  
Ioan Ardelean
Keyword(s):  
Curing Temperature ◽  
Early Hydration ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Fast Field

Measurement of the bending elastic modulus in unilamellar vesicles membranes by fast field cycling NMR relaxometry

2016 ◽  
Vol 201 ◽  
pp. 21-27 ◽  
Author(s):  
Gabriela A. Dominguez ◽  
Josefina Perlo ◽  
Carla C. Fraenza ◽  
Esteban Anoardo
Keyword(s):  
Elastic Modulus ◽  
Unilamellar Vesicles ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Fast Field

Wettability Evaluation by Fast Field Cycling NMR Relaxometry

2018 ◽  
Author(s):  
Jun Gao ◽  
Hyung T. Kwak ◽  
Ahmad M. Al Harbi
Keyword(s):  
Nmr Relaxometry ◽  
Field Cycling ◽  
Fast Field

scholarly journals A close view of the organic linker in a MOF: structural insights from a combined 1H NMR relaxometry and computational investigation

2020 ◽  
Vol 22 (27) ◽  
pp. 15222-15230
Author(s):  
Silvia Pizzanelli ◽  
Susanna Monti ◽  
Larisa G. Gordeeva ◽  
Marina V. Solovyeva ◽  
Angelo Freni ◽  
...  
Keyword(s):  
1H Nmr ◽  
Computational Investigation ◽  
Amine Nitrogen ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Organic Linker ◽  
Fast Field ◽  
Structural Insights ◽  
1H Nmr Relaxometry

Fast Field Cycling NMR combined with ReaxFF MDs and the PAW/GIPAW approach is used to characterize the amine nitrogen EFG tensor and its dynamics.

scholarly journals Hydration of MgO-Based Cement: Water Dynamics by 1H Fast Field-Cycling NMR Relaxometry

2017 ◽  
Vol 121 (48) ◽  
pp. 26851-26859 ◽  
Author(s):  
Francesca Martini ◽  
Silvia Borsacchi ◽  
Marco Geppi ◽  
Claudia Forte ◽  
Lucia Calucci
Keyword(s):  
Water Dynamics ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Fast Field

From Simple Liquid to Polymer Melt. Glassy and Polymer Dynamics Studied by Fast Field Cycling NMR Relaxometry: Rouse Regime

2008 ◽  
Vol 41 (14) ◽  
pp. 5322-5332 ◽  
Author(s):  
S. Kariyo ◽  
A. Brodin ◽  
C. Gainaru ◽  
A. Herrmann ◽  
J. Hintermeyer ◽  
...  
Keyword(s):  
Polymer Melt ◽  
Polymer Dynamics ◽  
Simple Liquid ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Fast Field

scholarly journals Impact of Bi2O3 and ZrO2 Radiopacifiers on the Early Hydration and C–S–H Gel Structure of White Portland Cement

2019 ◽  
Vol 10 (4) ◽  
pp. 46 ◽  
Author(s):  
Qiu Li ◽  
Nichola J. Coleman
Keyword(s):  
Portland Cement ◽  
Magic Angle Spinning ◽  
Cement Matrix ◽  
Resonance Spectroscopy ◽  
Magic Angle ◽  
Gel Structure ◽  
Early Hydration ◽  
Setting Times ◽  
The Impact ◽  
White Portland Cement

Bismuth oxide (monoclinic α-Bi2O3) and zirconium oxide (monoclinic ZrO2) are the most popular radiopacifiers in commercial Portland cement-based endodontic restoratives, yet their effects on the setting and hydration reactions are not fully understood. This study compares the impact of 20 wt.% of Bi2O3 or ZrO2 on the early hydration reactions and C–S–H gel structure of white Portland cement (WPC). Cement paste samples were hydrated at 37.5 °C prior to analysis by 29Si and 27Al magic angle spinning nuclear magnetic resonance spectroscopy at 3 h and 24 h, and transmission electron microscopy at 3 h. Initial and final setting times were determined using a Vicat apparatus and reaction kinetics were monitored by isothermal conduction calorimetry. Bi2O3 was found to prolong initial and final setting times and retard the degree of hydration by 32% at 24 h. Heat evolution during the acceleration and deceleration phases of the hydration process was reduced and the exotherm arising from renewed ettringite formation was delayed and diminished in the presence of Bi2O3. Conversely, ZrO2 had no significant impact on either setting time; although, it accelerated hydration by 23% within 24 h. Increases in the mean silicate chain length and the extent of aluminum substitution in the C–S–H gel were observed in the presence of both radiopacifying agents after 24 h relative to those of the unblended WPC. The Bi2O3 and ZrO2 particles remained intact within the cement matrix and neither bismuth nor zirconium was chemically incorporated in the hydration products.

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