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Microstructure, strength, and reaction products of ground granulated blast-furnace slag activated by highly concentrated NaOH solution

Published online by Cambridge University Press:  03 March 2011

Paul J. Schilling ,
Amitava Roy ,
H.C. Eaton ,
Philip G. Malone  and
Newell W. Brabston
Paul J. Schilling
Affiliation:
College of Engineering, Louisiana State University, Baton Rouge, Louisiana 70803-2755
Amitava Roy
Affiliation:
College of Engineering, Louisiana State University, Baton Rouge, Louisiana 70803-2755
H.C. Eaton
Affiliation:
College of Engineering, Louisiana State University, Baton Rouge, Louisiana 70803-2755
Philip G. Malone
Affiliation:
Geotechnical Laboratory, Waterways Experiment Station, U.S. Army Corps of Engineers, Vicksburg, Mississippi 39180
Newell W. Brabston
Affiliation:
Geotechnical Laboratory, Waterways Experiment Station, U.S. Army Corps of Engineers, Vicksburg, Mississippi 39180
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Abstract

Ground granulated blast-furnace slag was reacted in 5 M (pH 14.7) and 1.5 M (pH 14.2) NaOH solutions at a water/slag ratio of ∼0.4, and characterized by unconfined compressive strength testing, scanning electron microscopy, energy dispersive spectroscopy, and x-ray diffraction. The reacted material consisted of a dense layered matrix interspersed with unreacted glass particles and regions of reaction products with higher porosity. CSH(I) and (C, M)4AH13 were identified by x-ray diffraction. The C-S-H (calcium silicate hydrate) phase is proposed to consist mainly of structurally imperfect layers of tobermorite, interleaved with layers of (C, M)4AH13. Other cations, most significantly Na+, are incorporated into the structure. Use of the highly concentrated solution (5 M) produced a higher degree of reaction and, consequently, higher compressive strength (38 MPa after 28 days for 5 M solution vs 21 MPa for 1.5 M).

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 1 , January 1994 , pp. 188 - 197
Copyright
Copyright © Materials Research Society 1994

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