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Effect of condensed silica fume on the steel-cement paste transition zone

✍ Scribed by P.J.M. Monteiro; O.E. Gjorv; P.K. Mehta

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
922 KB
Volume
19
Category
Article
ISSN
0008-8846

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✦ Synopsis

The microstructure of the transition zone between steel and cement paste, and the effect of replacing portland cement by two levels of condensed silica fume was studied. Even with a high level of cement replacement (16%), some calcium hydroxide crystals with preferred orientation are formed near the interface. However, in the presence of silica fume, at a replacement level as low as 5%, the amount of preferentially oriented calcium hydroxide in the transition zone is considerably reduced, and a denser hydration product is formed. This may account for the observed increase in mechanical strength of the transition zone when condensed silica fume is used as concrete admixture.

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