scholarly journals INFLUENCE OF TITANIUM OXIDE ON THE MINERAL COMPOSITION AND THE PROPERTIES OF CEMENT

2011 ◽  
Vol 65 (1) ◽  
pp. 203-208
Author(s):  
Takashi CHABAYASHI ◽  
Akinori NAKAMURA ◽  
Hiroyoshi KATO ◽  
Kaori SADA
Keyword(s):  
Titanium Oxide ◽  
Mineral Composition

scholarly journals INFLUENCE OF TITANIUM OXIDE AND MANGANESE OXIDE ON THE MINERAL COMPOSITION AND THE PROPERTIES OF CEMENT

2013 ◽  
Vol 67 (1) ◽  
pp. 31-37
Author(s):  
Takashi CHABAYASHI ◽  
Akinori NAKAMURA ◽  
Hiroyoshi KATO ◽  
Kaori SADA
Keyword(s):  
Manganese Oxide ◽  
Titanium Oxide ◽  
Mineral Composition

scholarly journals INFLUENCE OF TITANIUM OXIDE AND DIPHOSPHORUS PENTAOXIDE ON THE MINERAL COMPOSITION AND THE STRENGTH DEVELOPMENT OF CEMENT

2010 ◽  
Vol 64 (1) ◽  
pp. 60-65
Author(s):  
Takashi CHABAYASHI ◽  
Akinori NAKAMURA ◽  
Hiroyoshi KATO ◽  
Kaori SADA
Keyword(s):  
Titanium Oxide ◽  
Mineral Composition ◽  
Strength Development

scholarly journals INFLUENCE OF TITANIUM OXIDE AND MAGNESIUM OXIDE ON THE MINERAL COMPOSITION AND THE PROPERTIES OF CEMENT

2012 ◽  
Vol 66 (1) ◽  
pp. 211-216
Author(s):  
Takashi CHABAYASHI ◽  
Akinori NAKAMURA ◽  
Hiroyoshi KATO ◽  
Kaori SADA
Keyword(s):  
Titanium Oxide ◽  
Magnesium Oxide ◽  
Mineral Composition

scholarly journals Groundmass Chromospinellides from Kimberlites of Khompu-May Kimberlite Field

2021 ◽  
Vol 906 (1) ◽  
pp. 012108
Author(s):  
Nikolay Oparin ◽  
Oleg Oleynikov
Keyword(s):  
Aluminum Oxide ◽  
Titanium Oxide ◽  
Mineral Composition ◽  
Structural Characteristics ◽  
Titanium Content ◽  
Current Paper ◽  
Oxide Content ◽  
Chromium Spinel ◽  
Two Stages ◽  
Kimberlite Field

Abstract The current paper presents the results of studying chromites of kimberlite mesostasis forming the Manchary, Aprelskaya, Erel, Turakhskaya, and Artemova pipes within the Khompu-May kimberlite field (central Yakutia). Despite shared texture and structural characteristics and mineral composition of the kimberlites, chromospinellide composition is distinctive in each pipe. Groundmass chromium spinel of the Aprelskaya and Erel kimberlite pipes is characterized by the highest aluminum oxide content (>10 wt. %). Chromites from the Erel and Turakhskaya pipes as well as a fraction of grains from the Manchary pipe with titanium oxide (<4 wt. %) form a field of common composition by Cr2O3 and TiO2 content. The Aprelskaya and Artemova pipes show up to 17 wt. % TiO2 in chromites. Such a difference in titanium content correlates with perovskite content in kimberlite groundmass of the Khompu-May field. The results of the study revealed two trends in evolution of chromospinellide microcrystals (R. Mitchell, 1986) – ulvöspinel associated with typical kimberlites and titanomagnetite characteristic of micaceous kimberlites. Chromospinellides of the Aprelskaya pipe demonstrate the ulvöspinel trend only, suggesting earlier spinel crystallization relative to groundmass mica. Spinellides from the Erel and Artemova pipes follow the titanomagnetite trend only, being crystallized after formation of mesostasis mica. Spinellides from the Manchary and Turakhskaya pipes meet the ulvöspinel and titanomagnetite trend, indicating two stages of mineral crystallization relative to phlogopite.

scholarly journals INFLUENCE OF TITANIUM OXIDE IN CLINKER ON THE MINERAL COMPOSITION AND THE COMPRESSIVE STRENGTH OF CEMENT

2009 ◽  
Vol 63 (1) ◽  
pp. 114-119
Author(s):  
Takashi CHABAYASHI ◽  
Akinori NAKAMURA ◽  
Hiroyoshi KATO ◽  
Michihito NAKATANI
Keyword(s):  
Compressive Strength ◽  
Titanium Oxide ◽  
Mineral Composition

Mineral composition and gemological characteristics of the fossil marine reptiles of the Ulyanovsk region

2018 ◽  
pp. 12-16 ◽  
Author(s):  
D. A. Petrochenkov
Keyword(s):  
Chemical Composition ◽  
Bone Tissue ◽  
Mineral Composition ◽  
Bone Structure ◽  
Upper Jurassic ◽  
Marine Reptiles ◽  
Ulyanovsk Region ◽  
Impurity Elements ◽  
Wide Assortment

Fossils of marine reptiles are a new jewelry and ornamental material and collected in the Ulyanovsk region from the Upper Jurassic deposits. They consist of (wt. %): calcite — 52, apatite — 24 and pyrite — 23, and also gypsum presents. The contents of radioactive and carcinogenic elements are close to background. The original bone structure of reptiles is preserved. Apatite replaces the bone tissue of marine reptiles, forming a cellular framework. According to the chemical composition, apatite refers to fluorohydroxyapatite with an increased Sr content. The size of the crystals is finely-dispersed. Calcite and pyrite fill the central parts of the cells. Calcite crystals of isometric and elongated shape, 0,01—0,05 mm in size, form blocks up to 0,3 mm during intergrowth. Calcite fills thin, discontinuous veins along the contour of cells with a width of up to 0,03 mm. In calcite, among the impurity elements, there are (wt. %, on the average): Mg — 0,30, Mn — 0,39 and Fe — 0,96. Pyrite forms a dispersed impregnation in calcite and apatite, content of impurities is, wt. %: Ni — up to 0,96 and Cu — up to 0,24. On technological and decorative characteristics of fossils of sea reptiles of Ulyanovsk region are qualitative jewelry and ornamental materials of biomineral group, allowing to make a wide assortment of jewelry and souvenir products.

THE STUDY OF THE MINERAL COMPOSITION OF BIRTHWORT DUTCHMAN’S PIPE (A

Fitoterapia ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 55-57
Author(s):  
L. I. Pohodina ◽  
◽  
N. Ye. Burda ◽  
V. S. Kyslychenko ◽  
A. A. Voloshyna ◽  
...  
Keyword(s):  
Mineral Composition

Study Of Structure Formation Of Organic-Mineral Compositions With Fibrous Filler By Electron Microscopy Method

2019 ◽  
pp. 41-47
Keyword(s):  
Electron Microscopy ◽  
Structure Formation ◽  
Mineral Composition ◽  
Bending Strength ◽  
Cement Stone ◽  
Hydrated Cement ◽  
Fibrous Filler ◽  
Organic Mineral ◽  
Microscopy Method ◽  
Mineral Compositions

The article presents the study of processes of structure formation of cement stone and products of hardening of organic-mineral compositions with fibrous filler (shavings) by the electronic scanning microscopy method. It is established that the additive-free cement stone at the age of 28 days has a dense and homogeneous structure, consists of calcium hydro-silicates, Portlandite and calcite - newgrowths characteristic for cement systems. Cellulose fibers, which make up the bulk of the substance of shavings, are sufficiently active, which determines the high adhesion of the hydration products of the cement binder to their surface. It is shown that the introduction of shavings into the organo-mineral composition leads to inhibition of cement hydration processes. Organo-mineral compositions with different shavings content (two compositions) were analyzed. The first composition is characterized by a fairly dense structure, the cement stone consists of globular nanoscale nuclei of hydrosilicates, Portlandite and calcite. The second composition has a loose porous structure, cement stone consists of non-hydrated cement grains, newgrowths are represented by calcite and vaterite. The structure of the contact zone "osprey fiber-cement stone" in the organo-mineral composition of the first composition indicates a good adhesion of the filler surface with the phases of hydrated cement. The use of shavings as a fibrous filler (the first composition) increases the tensile and bending strength, as well as the wear resistance of organo-mineral compositions. The data obtained by scanning electron microscopy are confirmed by the results of studying the processes of structure formation of cement stone by quantitative x-ray phase analysis.

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