scholarly journals Hydration Process for Calcium-Aluminate Cement within EVA Emulsion by SPring-8 Synchrotron Radiation X-ray Diffraction Method

2005 ◽  
Vol 54 (7) ◽  
pp. 780-784 ◽  
Author(s):  
Masaru KOTERA ◽  
Ikuyo MATSUDA ◽  
Keiko MIYASHITA ◽  
Nobuyuki ADACHI ◽  
Hisayuki TAMURA
Keyword(s):  
Synchrotron Radiation ◽  
Calcium Aluminate ◽  
Diffraction Method ◽  
Calcium Aluminate Cement ◽  
Hydration Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Aluminate Cement

A new insight on alkaline hydrolysis of calcium aluminate cement concrete: Part I. Fundamentals

1996 ◽  
Vol 11 (7) ◽  
pp. 1748-1754 ◽  
Author(s):  
S. Goñi ◽  
C. Andrade ◽  
J. L. Sagrera ◽  
M. S. Hernández ◽  
C. Alonso
Keyword(s):  
Calcium Aluminate ◽  
Alkaline Hydrolysis ◽  
Degradation Process ◽  
Calcium Aluminate Cement ◽  
X Ray Diffraction ◽  
Cement Concrete ◽  
X Ray ◽  
Concrete Part ◽  
Hydrolysis Of ◽  
Aluminate Cement

In this work a hypothesis to explain the alkaline hydrolysis degradation process of calcium aluminate cement concrete (CACC) is presented. The hypothesis is based on x-ray diffraction (XRD) data of some samples taken from real Spanish CACC structures. The identification from XRD data of a hydrated alkaline aluminate could serve as a guide to differentiate both processes of normal carbonation and alkaline hydrolysis.

scholarly journals Physical properties and hydration evolution of dispersant containing calcium aluminate cement compositions for endodontic applications

Cerâmica ◽  
2014 ◽  
Vol 60 (355) ◽  
pp. 366-370 ◽  
Author(s):  
A. P. Luz ◽  
V. C. Pandolfelli
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Calcium Aluminate ◽  
Dimensional Change ◽  
Calcium Aluminate Cement ◽  
X Ray Diffraction ◽  
Cement Pastes ◽  
X Ray ◽  
Polymeric Dispersant ◽  
Aluminate Cement

The purpose of this study was to evaluate the physical properties and hydration evolution of calcium aluminate cement (CAC) compositions containing an advanced dispersant. The compressive strength, dimensional change, apparent porosity and quantitative X ray diffraction analysis (XRD) of the cement pastes were carried out over 1-15 days of curing (with the samples immersed in distilled water) at 37 ºC. The addition of a polymeric dispersant to the selected CAC (Secar 71) resulted in higher, but suitable expansion of the cement samples, and improved uniaxial compressive strength reaching values in the range of 73-87 MPa after 15 days. Quantitative XRD results also showed that C3AH6 and Al(OH)3 were the main phases detected during the cement hydration process, but CAH10 and C2AH8 were also found due to the higher water availability in the curing environment. According to the attained results, it could be concluded that the dispersant containing calcium aluminate cement compositions have the potential to be used as endodontic materials.

scholarly journals Physics-chemical study of hydration process of three calcium aluminate phase and Metakaolin

2014 ◽  
Vol 12 ◽  
pp. 107-112
Author(s):  
Ts Erdenebat ◽  
R Sanjaasuren
Keyword(s):  
Calcium Aluminate ◽  
Early Stage ◽  
Chemical Study ◽  
Hydration Process ◽  
Phase Content ◽  
Chemical Analyses ◽  
X Ray Diffraction ◽  
X Ray

This research based on X-Ray Diffraction, SEM and chemical analyses were revealed that decreasing of Ca(OH)2 phase content and increasing of C3AH6 and trisulfate aluminate calcium-3 as the stable phases for the hydration period of first 30 to 60 minutes when comparing K-crent doping to the phase to without any doping. Also results have been proposed in case of doping metakaoline to draw structural analogies as formation of stable hydrated phases and the decrease of new formed unstable crystalline metaphases in the early stage of 3CAO·Al2O3 hydration process.DOI: http://dx.doi.org/10.5564/mjc.v12i0.183 Mongolian Journal of Chemistry Vol.12 2011: 107-112 

Analysis of Composite Structures on Barium Titanate Fine Particles Using Synchrotron Radiation

2006 ◽  
Vol 301 ◽  
pp. 239-242 ◽  
Author(s):  
Takuya Hoshina ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
Satoshi Wada ◽  
Masatomo Yashima ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Barium Titanate ◽  
Size Effect ◽  
Composite Structure ◽  
Composite Structures ◽  
Fine Particles ◽  
Rietveld Method ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray

The crystal structures of barium titanate (BaTiO3) fine particles with a size around 140 nm were investigated using a synchrotron radiation X-ray diffraction method. The observed diffraction pattern was analyzed by Rietveld method assuming several models. As a result, it is found that the BaTiO3 fine particles have composite structures include (a) a tetragonal region with a constant c/a ratio, (b) a tetragonal region with gradient c/a ratios and (c) a cubic region. In order to estimate these structures, the partial profile relaxation technique was applied in the Rietveld refinement. It is considered that the composite structure is important for the size effect on BaTiO3 fine particles.

Study on pyrite FeS2 films deposited on Si(100) substrate by synchrotron radiation surface X-ray diffraction method

2004 ◽  
Vol 268 (1-2) ◽  
pp. 222-226 ◽  
Author(s):  
Dongyun Wan ◽  
Qing He ◽  
Lipeng Zhang ◽  
Quanjie Jia ◽  
Rengang Zhang ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray
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