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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    Elsevier

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    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Ramlochan, T
    • Thomas, MDA
    • Hooton, R D
  • Publication Date: 2004-8

Language

  • English

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  • Accession Number: 00983073
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 9 2004 12:00AM