Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 78: Issue 1
Influence of two different fly ashes on the hydration of portland cements
Authors:
V. Rahhal U.N.C.P.B.A Departamento de Ingeniería Civil, Facultad de Ingeniería Avda. del Valle 5737, (B7400JWI) Olavarría Argentina E-mail Avda. del Valle 5737, (B7400JWI) Olavarría Argentina E-mail

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R. Talero Instituto de Ciencias de la Construcción 'Eduardo Torroja' C.S.I.C. Serrano Galvache, 4, 28033 Madrid Spain E-mail C.S.I.C. Serrano Galvache, 4, 28033 Madrid Spain E-mail

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Pages:
191–205
Online Publication Date:
03 Jan 2005
Publication Date:
01 Oct 2004
Article Category:
Research Article
DOI:
https://doi.org/10.1023/b:jtan.0000042167.46181.17
Keywords:
XRD; conduction calorimetry; fly ashes; portland cements; pozzolanic cements; pozzolanicity; setting times
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Abstract  

Fly ashes from the combustion of coal thermal power stations are commonly incorporated into portland cements and/or concretes and mortars. The chemical and morphological composition of fly ashes, together with their particle size, make them suitable as pozzolanic(non-calcic) or pozzolanic/hydraulic(highly calcic) additions to manufacture such building materials. This work focuses on the incorporation of two different fly ashes (non-calcic but of very different Fe2O3(%) contents, fineness and morphology) to two ordinary portland cements (of very different mineralogical composition as well), to determine the effects those have and the interactions they produce in the hydration reactions of portland cement. The main techniques employed for this study have been: conduction calorimetry and Frattini test; secondary techniques applied have also been: determination of setting times and analysis by X-ray diffraction and SEM. Analysis of the results obtained permitted to find different effects of fly ash addition on the hydration reactions of portland cements. Thus, dilution and stimulation effects augment with the increased fly ash percentage. Delay and acceleration of the reactions depend mainly on the type of portland cement and are accentuated with increased fly ash contents. Their behaviour as concerns heat dissipation mainly, depends on the type of fly ash used and is more pronounced with increased cement replacement. On the other hand, the pozzolanic activity of these fly ashes has been revealed at 7 and 28 days, but not at 2 days. Finally, pozzolanic cements can be manufactured using different portland cements and/or types of fly ashes, in the appropriate proportions and compatible qualities, depending on the effect(s) one wish to enhance at a specific age, which is according to previous general conclusions drew out of sulphate attack and chloride attack researches.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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