In-situ monitoring of hydration kinetics of cement pastes by low-field NMR

2010 ◽  
Vol 25 (4) ◽  
pp. 692-695 ◽  
Author(s):  
Anming She ◽  
Wu Yao ◽  
Yongqi Wei
Keyword(s):  
In Situ Monitoring ◽  
Hydration Kinetics ◽  
Cement Pastes ◽  
Low Field ◽  
Low Field Nmr ◽  
Kinetics Of

Water evolution and hydration kinetics of cement paste under steam-curing condition based on low-field NMR method

2020 ◽  
pp. 121583
Author(s):  
Chao Zou ◽  
Guangcheng Long ◽  
Xiaohui Zeng ◽  
Cong Ma ◽  
Youjun Xie ◽  
...  
Keyword(s):  
Cement Paste ◽  
Hydration Kinetics ◽  
Steam Curing ◽  
Nmr Method ◽  
Low Field ◽  
Low Field Nmr ◽  
Curing Condition ◽  
Kinetics Of

In Situ Electrochemical Study of Copper Nanoparticles Stabilized with Food Grade Gelatin

2016 ◽  
Vol 705 ◽  
pp. 163-167 ◽  
Author(s):  
Ellaine M. Datu ◽  
Mary Donnabelle L. Balela
Keyword(s):  
Electroless Deposition ◽  
Reduction Rate ◽  
In Situ Monitoring ◽  
Mixed Potential ◽  
Cu Nanoparticles ◽  
Environment Friendly ◽  
Food Grade ◽  
Alternative Material ◽  
Kinetics Of

Commercially available conductive inks are typically made up of precious metal nanoparticles, such as gold (Au) and silver (Ag). Thus, cheaper metals like copper (Cu) are currently being explored as alternative material. Though Cu has a comparable conductivity to that of Ag, they tend to oxidize easily when exposed to air and water, which could limit their application. In this work, oxidation-stable Cu nanoparticles with mean diameter as small as 57 nm were prepared by simple electroless deposition in water. Food-grade gelatin was used as stabilizer, which makes the process more economical and environment-friendly. In situ monitoring of mixed potential was carried out during synthesis to understand the kinetics of the reaction. The mixed potential of the solution shifted negatively as the amount of gelatin was increased. This suggests faster reduction rate.

The Influence of Various Gypsum Dosage, Specific Area of Cement and Water Reducers on Bleeding of Fresh Cement Paste Using Low-Field NMR

2021 ◽  
Vol 1036 ◽  
pp. 255-262
Author(s):  
Yan Liang Ji ◽  
Zhen Ping Sun ◽  
Min Pang
Keyword(s):  
Cement Paste ◽  
Specific Area ◽  
High Water ◽  
Low Permeability ◽  
Cement Pastes ◽  
Bleeding Rate ◽  
Low Field ◽  
Low Field Nmr ◽  
Type Water ◽  
Hot Zone

Based on the low-field NMR, this study inveitigated bleeding property of the fresh cement pastes mixed with various gypsum dosage, specific area of cement and water reducers. Results showed that the gypsum dosage between 3 % and 5 % will cause an decrease bleeding and a lower bleeding velocity, while a 1 % gypsum dosage will increase the bleeding as a function of time. The increase of the cement surface will lead to a less bleeding rate. This can be explained that the finer particle will contribute to the packing which will form a low permeability of the cement paste, as a result less bleeding water is observed. The PCEs-made sample has smaller hot zone area which indocated the PCEs has good bleeding stability when varing water cement ratio. Furthermore, bying comparing with the NPE, it was found the ACS type water reducer has higher bleeding sensitivity when high water cement ratios were used.

scholarly journals In situ monitoring of hydrothermal reactions by X-ray diffraction with Bragg–Brentano geometry

2020 ◽  
Vol 53 (4) ◽  
pp. 1163-1166
Author(s):  
Karsten Mesecke ◽  
Winfried Malorny ◽  
Laurence N. Warr
Keyword(s):  
Quantitative Information ◽  
In Situ Monitoring ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Saturated Vapour Pressure ◽  
Concrete Production ◽  
Aerated Concrete ◽  
Kinetics Of

This note describes an autoclave chamber developed and constructed by Anton Paar and its application for in situ experiments under hydrothermal conditions. Reactions of crystalline phases can be studied by successive in situ measurements on a conventional laboratory X-ray diffractometer with Bragg–Brentano geometry at temperatures <483 K and saturated vapour pressure <2 MPa. Variations in the intensity of X-ray diffraction reflections of both reactants and products provide quantitative information for studying the reaction kinetics of both dissolution and crystal growth. Feasibility is demonstrated by studying a cementitious mixture used for autoclaved aerated concrete production. During a period of 5.7 h at 466 K and 1.35 MPa, the crystallization of torbermorite and the partial consumption of quartz were monitored.

In-situ heavy oil viscosity prediction at high temperatures using low-field NMR relaxometry and nonlinear least squares

Fuel ◽  
2020 ◽  
Vol 260 ◽  
pp. 116328 ◽  
Author(s):  
Strahinja Markovic ◽  
Jonathan L. Bryan ◽  
Aman Turakhanov ◽  
Alexey Cheremisin ◽  
Sudarshan A. Mehta ◽  
...  
Keyword(s):  
Least Squares ◽  
High Temperatures ◽  
Heavy Oil ◽  
Nonlinear Least Squares ◽  
Oil Viscosity ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Viscosity Prediction ◽  
Low Field Nmr

scholarly journals In Situ Detection of Subsurface Biofilm Using Low-Field NMR: A Field Study

2015 ◽  
Vol 49 (18) ◽  
pp. 11045-11052 ◽  
Author(s):  
Catherine M. Kirkland ◽  
Maria P. Herrling ◽  
Randy Hiebert ◽  
Andrew T. Bender ◽  
Elliot Grunewald ◽  
...  
Keyword(s):  
Field Study ◽  
Low Field ◽  
Low Field Nmr ◽  
In Situ Detection
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