Chemical Sciences/Material Chemistry
In order to take into account a possible effect due to 421 the different batches of C 3 A, the C 3 A hydration was again carried out in the 422 presence of 8% of gypsum and without an initial ettringite addition. … Fetch Content
INFLUENCE OF LIMESTONE ON SULFATE INGRESSION – Concrete In …
Precipitation of gypsum and ettringite near the surface. Further within the sample the depletion of portlandite and AFm phases is observed [1, 2]. … Read Full Source
Ettringite
Ettringite Ca 6 Al 2 (SO 4) 3 (OH) 12 • 26H 2 O c2001-2005 Mineral Data Publishing, version 1 Crystal Data: Hexagonal. Association: Portlandite, afwillite, hydrocalumite (Scawt Hill, Ireland); afwillite, hydrocalumite, mayenite, gypsum (Hatrurim Formation, Israel). … Get Content Here
Solidification/Stabilization Of Power Plants Wastes …
Showed two endothermic peaks which corresponded to ettringite and gypsum. The exothermic peaks in the DTA curves resulted from ignition of residual particles of coal, or carbon particles from the fly ash. … Access Full Source
The Release Mechanism Of Hexavalent Chromium
The reason lies in the fact that some clinker phases in the absence of gypsum react with water giving hydrated products that mayimmobilize chromate ions, where as in the presence of gypsum the same phases react to form ettringite which has a lower tendency to immobilization. … Read Document
Recommended Practice For Stabilization Of Sulfate Rich …
But in natural soils, replenishment of water due to precipitation and ground water flow can result in continuous dissolution of gypsum, providing a source of sulfate for ettringite formation. … Document Retrieval
Cement And Concrete – About Geology – The Complete Guide To …
Clinker is ground to powder and mixed with a small amount of gypsum, which slows down the hardening process. Ettringite (Ca 6 Al 2 (SO 4) 3 (OH) 12 · 26H 2 O; includes some Fe) Monosulfate ([Ca 2 (Al,Fe)(OH) 6] · (SO 4,OH,etc) · xH 2 O) … Read Article
DEF AND ASR IN CONCRETE – A SYSTEMATIC APPROACH FROM PETROGRAPHY
The high sulfate can be from gypsum in portland cement, alkali sulfates in clinker, or sulfates as interstitial impurities in alite and belite phases Ettringite crystals in gaps are not always distinct in some photos at the present magnifications. … Retrieve Document
Installing MAPEI Products Over Gypsum
Refer to CTIOA (Ceramic Tile Institute of America) Report #2003-4-08 for information on the causes and effects of ettringite. Hydronic radiant-heat systems (water tubes) with gypsum-based floor levelers in interior, dry conditions • The hydronic radiant-heat system must be installed in strict … Fetch This Document
Influence Of The SO⇅ Content Of Cement On The …
Relative Intensity Ratios of Ettringite and Gypsum for the 3.0% SO 3 Content Mortar Cubes at the Age of 360 Days in Sulfate 87 Figure 34. … Retrieve Document
ALTERATION OF THE CEMENTITIOUS MATERIAL UNDER THE SALINE …
The increase of the Al concentration in the DIW cases would be dissolution of ettringite. In the ASW case, precipitation of gypsum or other sulfo-alminate phase might cause the lower concentration of Al. … Fetch Document
Estimation Of Potential Pollution Of Uranium Sludge From Acid …
According to table 2, the predominant crystallized phases are ettringite and gypsum. After the solution of the gypsum in the intermediate sample, it was possible to identify some other crystallized phases that were not previously identified, such as calcite, fluorite, gibbsite and portlandite. … Access This Document
Mineralogical And Chemical Investigation Of Fly Ash From The …
The trace amounts of gypsum, bassanite, ettringite and tobermorite observed in the investigated fly ash were formed during soaking of the fly ash, at temperatures … Retrieve Here
Efiect Of Zn, Cu, Cr And Pb Chlorides On The Formation Of …
gypsum to form well crystallized ettringite in several kinds of solution. Kakali et al: [14] studied the hydration process in cements made from raw mixes containing transition … Access Doc
Solidification/Stabilization Of Power Plants Wastes …
On the basis of these results it was concluded that fly ash reacts with FGD gypsum and lime forming ettringite. Ettringite formation is important because of its possibility for immobilization of cation or oxyanion forms of trace elements (cations and oxyanions can be incorporated into the ettringite … Get Doc
Benutzer:Guandalug/CommonsMinerale – Wikipedia
Category:Ettringite: Ettringit; Category:Euchroite; Category:Euclase: Euklas Category:Art made from gypsum; Category:British Gypsum; Category:Gypsum locations … Read Article