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Tuesday, May 19, 2020 | History

1 edition of Ettringite found in the catalog.

Ettringite

Ettringite

Cancer of Concrete

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  • 29 Currently reading

Published by Burgess Publishing .
Written in English


The Physical Object
FormatPaperback
ID Numbers
Open LibraryOL11313833M
ISBN 100808795651
ISBN 109780808795650

The gypsum is also highly soluble and the sulfates react with the aluminates to form the mineral ettringite. If all the sulfate reacts before all the C3A does then the level of the sulfate ions decreases and the ettringite becomes unstable and undergoes a second reaction over several hours to form monosulfate which is lower in sulfate. Media in category "Ettringite" The following files are in this category, out of total. (previous page) ()Named after: Ettringen, naming locality.

() ettringite. In: Manutchehr-Danai M. (eds) Dictionary of Gems and Gemology. Springer, Berlin, Search book. Search within book. Type for suggestions. Table of contents Previous. Page Navigate to page number. of Next. About this reference work. A beautiful well developed light lemon yellow crystal specimen of Ettringite from N'Chwaning Mines, South Africa. A pleasing crystal of Ettringite measuring to cm displays excellent prism faces with pyramid development truncated by a pinacoid face.

Ettringite is a beautiful and interesting mineral for collectors. It forms as a precipitate from hydrothermal solutions. It has a typically bright yellow color and a nice luster. For collectors who like good crystal formations, ettringite has that too. It will commonly form well shaped hexagonal prisms that are topped by a hexagonal pyramid.   Ettringite was formed during the hydration of C 3 A with gypsum at temperatures between 25 and 80°C. Ettringite formation was retarded when hydration was carried out in KOH solutions whose concentrations were as high as 2 by:


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Ettringite Download PDF EPUB FB2

Ettringite. Ettringite is an expansive reaction product related to dissolved sulfates and is usually considered as the main sulfate-related destructive force in concrete. this problem with performance tests is discussed in further detail in chapter 9 of the book by Skalny et al.

Ettringite mainly forms in the interior region of the cement when exposed to brine saturated with CO 2 and H 2 S, because the low pH at the surface of cement in contact with CO 2 and H 2 S saturated brine makes ettringite unstable.

55 The formation of ettringite in the interior region of cement reveals that H 2 S is able to penetrate to the. Ettringite Crystallography: Axial Ratios: a:c = Cell Dimensions: a =c =Z = 8; V = 9, Den(Calc)= Crystal System.

Ettringite is also known as c ement bacillus, which is the name of a naturally occurring mineral of the same composition and structure. The formation of ettringite or cement bacillus has been recognized as the cause of excessive expansion, cracking and even complete disintegration of concrete Ettringite book to intensive sulfate attack.

Pre˝ious studies on ettringite solubility and geochemistry of the Ca OH –Al SO –H O sys() () 43 2 tem The earliest ettringite solubility study was con-ducted by Joneswho reported that -sulfoaluminate dissolves incongruently to gyp-sum File Size: 1MB.

Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF.

Delayed ettringite formation (DEF) is expansion and cracking of concrete associated with the delayed formation of the mineral ettringite which is a normal product of early cement hydration. DEF is a result of high early temperatures (above 70 o C – 80 o C) in the concrete which prevents the.

How to say ettringite in English. Pronunciation of ettringite with 1 audio pronunciation, 1 meaning, 3 translations and more for ettringite.3/5. Ettringite definition is - a mineral Ca6Al2(SO4)3(OH)H2O consisting of hydrous basic sulfate of calcium and aluminum.

Ettringite Ca6Al2(SO4)3(OH)12•26H2O c Mineral Data Publishing, version 1 Crystal Data: Hexagonal. Point Group: 3m. Crystals prismatic and striated along [], to 20 cm, commonly unterminated, rarely dipyramidal {}; fibrous to cottonlike. Unfortunately, this book can't be printed from the OpenBook.

If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF. Below is the uncorrected machine-read text.

In this study, the principles of chemical precipitation of sulfate which is based on the formation of ettringite, a double salt with the formula Ca3Al2OCaSO(4)H(2)O are evaluated. Ettringite is a calcium aluminum sulfate mineral characterized by high water content, estimated as 32 water molecules per formula unit.

Three examples of utilization of near-infrared (NIR) spectroscopy are here shown. First of all, information on water distribution in pure ettringite was deduced and compared with infrared by: Ettringite is a long, large crystal that is only stable in a sulfate saturated environment. The formation of ettringite eventually uses up all the sulfate in the environment causing it to form into three monosulfate crystals.

The three monosulfates usually do not form into anything else. Additional Physical Format: Online version: Ettringite. Farmington Hills, Mich.: American Concrete Institute, © (OCoLC) Document Type. Hydration of Portland Cement. Introduction Portland cement is a hydraulic cement, hence it derives its strength from chemical reactions between the cement and water.

The process is known as hydration. Cement consists of the following major compounds (see composition of cement): Tricalcium silicate, C 3 S; Dicalcium silicate, C 2 S; Tricalcium.

Ettringite Formation and Sulfate Attack on Concrete by M. Collepardi Synopsis: The paper presents a critical review of the relationship between ettringite formation and sulfate attack. Ettringite formation is associated with expansion.

However, not necessarily any ettringite-related expansion is. The effect of secondary ettringite formation on the durability of concrete: a literature analysis.

Ettringite Group. Although it is generally assumed that a solid solution series between ettringite and thaumasite exists, both species have different space groups and a possible discontinuity was identified, characterised by a gap in the a-dimension of the solid-solution phases (Barnett et al., ).Further work showed a miscibility gap in the solid solution (Barnett et al., ): ettringite.

The sturmanite forms yellowish coatings, with ettringite cores. Comments: Ettringite is not generally facetable; any cut stone would be considered an extreme rarity. South African material has yielded minute stones, some of which may have been labeled sturmanite. Ettringite is not visible with the naked eye, but its needle-like crystals can be seen under a microscope.

Both water and space must be present for the ettringite crystals to form. The modes of ettringite formation are: Primary Ettringite this is a normal by-product of early Portland cement hydration. It is necessary and beneficial in the.Spray of ettringite prisms on "antozonite" ("Stinkspat").

The ettringite was identified by EDS-analyses which revealed also trace amounts of Cu, Si and As. At very high magnifications the hexagonal cross-section and the basal pinacoid can be recognised.

This material was found in Collection Heinz Förch, photo Harald Schillhammer.Although ettringite is a crucial material in terms of Se immobilization, the immobilization mechanisms, atomic configuration, and intercolumn structure of Se sorbed in ettringite are unclear.