Development of Calcined Clays as Pozzolanic Additions in Portland Cement Concrete Mixtures

Zayed, Abla; Shanahan, Natallia; Sedaghat,A; Stetsko,Y.; Lorentz, B.; University of South Florida. Dept. of Civil and Environmental Engineering

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Development of Calcined Clays as Pozzolanic Additions in Portland Cement Concrete Mixtures

2018-08-01
By Zayed, Abla ; Shanahan, Natallia ; Sedaghat,A ; ...

[PDF-4.37 MB]

English

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Creators:

Zayed, Abla ; Shanahan, Natallia ; Sedaghat,A ; Stetsko,Y. ; Lorentz, B.

Zayed, Abla ; Shanahan, Natallia ; Sedaghat,A ; Stetsko,Y. ; Lorentz, B. Less -
Corporate Creators:

University of South Florida. Dept. of Civil and Environmental Engineering
Corporate Contributors:

Florida. Dept. of Transportation ; United States. Department of Transportation ; United States. Federal Highway Administration

Florida. Dept. of Transportation ; United States. Department of Transportation ; United States. Federal Highway Administration Less -
Subject/TRT Terms:

[+]

Calcined Clay Clay Soils Compressive Strength Diffraction Geotechnology Highways Kaolinite Materials Mortar Compressive Strength Portland Cement Pozzolanic Action Research Thermogravimetric Analysis X-ray Diffraction X-ray Fluorescence
Publication/ Report Number:

BDV25-977-38
Resource Type:

Tech Report
Geographical Coverage:

Florida ; United States

Florida ; United States Less -
Edition:

Final Report January 18, 2017-August 31, 2017
Corporate Publisher:

University of South Florida. Dept. of Civil and Environmental Engineering
Abstract:

A number of clay sources in the state of Florida were characterized in this study. It was determined that field material contains a substantial portion of sand, approximately 65-80%, which needs to be beneficially processed before the material can be used as a pozzolan. The clay fraction met the chemical oxide composition requirements of ASTM C618. All samples had a sum of SiO2, Al2O3, and Fe2O3 oxides above 70%, and their SO3 content was below 4%. Additionally, the clay fraction had a high kaolinite content, 70-90%, which indicates a good potential of producing a high-quality pozzolanic material on calcination. It was determined that complete dehydroxylation of all the clay samples occurred at 600˚C and that further heating to 800˚C did not increase the amorphous content of the calcined clays. Pozzolanic activity of the material calcined at 600˚C was evaluated by compressive strength testing at 7 and 28 days at a replacement level of 10%. The results showed that the Florida clays obtained can be calcined for use in portland cement concrete materials, and are capable of yielding strength indices meeting the requirements of ASTM C618 at a 10% replacement level, and are, therefore, suitable for use in concrete as Class N natural pozzolans.
Format:

PDF
Funding:

BDV25-977-38
Collection(s):

US Transportation Collection
Main Document Checksum:

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urn:sha256:7054843469ce5e272f3ea8269e244acfb0e46208eb999229fe54b5ae731a1eda
Download URL:

https://rosap.ntl.bts.gov/view/dot/37304/dot_37304_DS1.pdf
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Development of Calcined Clays as Pozzolanic Additions in Portland Cement Concrete Mixtures

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