TRANSPORT PROPERTIES OF MORTARS AND CONCRETES MODIFIED WITH MEDIUM HYDRAULIC ACTIVITY GROUND GRANULATED BLAST FURNACE SLAG

Omar KHODJET-KESBA, Said KENAI, Luc COURARD, J.M. KHATIB

Résumé


Abstract:
Mechanical characteristics and durability of ground granulated blast furnace slag cernent
composites depends on the hydraulic activity of the slag. Algerian Blast furnace slag is
characterized by a quite slow reactivity. Porosity and transport properties of mixes containing
up to 50% OPC replacement are compared and analyzed. Mechanical strength, pore size
distribution and capillary water absorption are studied after 28 and 90 days of wet curing. The
durability of blast furnace slag cement concrete is evaluated through nitrogen permeability
and water penetration depth under pressure. First observations seem to indicate finer porosity
and lower water absorption than with 100% CEM I 52.5 mortars. Moreover, lower
permeabilities to nitrogen and water are also observed for 50% blast furnace slag substitution.

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