THE EFFECT OF POZZOLANS AND SLAG ON THE EXPANSION OF MORTARS CURED AT ELEVATED TEMPERATURE PART II: MICROSTRUCTURAL AND MICROCHEMICAL INVESTIGATIONS
The microstructural and microchemical development of heat-cured Portland cement mortars containing silica fume, metakaolin, blast-furnace slag, and fly ash were analyzed in this paper using pore solution analysis, X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy-dispersive X-ray analysis (EDX). Incorporation of these materials into the mixture modifies the composition of the C-S-H gel, the quantities of the hydration products, and the microstructure. Ettringite was formed during moist storage in all specimens, but was not accompanied by expansion where a sufficient amount of metakaolin, blast-furnace slag, or a suitable fly ash replaced a proportion of the Portland cement; replacement with silica fume was not as effective at eliminating expansion. The different behavior of silica fume from the other supplementary cementing materials is believed to reflect a difference in the way ettringite is formed in the presence of Al2O3-bearing mineral admixtures.
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Corporate Authors:
The Boulevard, Langford Lane
Kidlington, Oxford United Kingdom OX5 1GB -
Authors:
- Ramlochan, T
- Thomas, MDA
- Hooton, R D
- Publication Date: 2004-8
Language
- English
Media Info
- Features: Figures; References; Tables;
- Pagination: 16 p.
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Serial:
- Cement and Concrete Research
- Volume: 34
- Issue Number: 8
- Publisher: Elsevier
- ISSN: 0008-8846
- Serial URL: http://www.sciencedirect.com/science/journal/00088846
Subject/Index Terms
- TRT Terms: Blending; Cement; Chemical properties; Concrete; Curing agents; Ettringite; Expansion; Heat; Mortar; Pozzolan; Slag; Structural analysis; Sulfates
- Subject Areas: Highways; Materials; I32: Concrete;
Filing Info
- Accession Number: 00983073
- Record Type: Publication
- Files: TRIS
- Created Date: Dec 9 2004 12:00AM