Title:
Influence of Blast Furnace Cements on Durability of
Concrete Structures
Author(s):
J. Geiseler, H. Kollo, and E. Lang
Publication:
Materials Journal
Volume:
92
Issue:
3
Appears on pages(s):
252-257
Keywords:
alkali-aggregate reactions; blast furnace slag; carbonation;
cements; chlorides; concretes; corrosion; density (mass/volume); diffu-sion;
durability; freeze-thaw durability; heat of hydration; seawater;
strength; sulfate attack.
DOI:
10.14359/9773
Date:
5/1/1995
Abstract:
Results of investigations in laboratory-scale work as well as long-term experience in practice indicate the special qualification of blast furnace cements, due to their high resistance against alkali-aggregate reaction, sulfate attack, and diffusion of chlorides into concrete. Recent research has also shown the high binding capacity of chlorides in blast furnace cement pastes. A further aspect of importance for corrosion protection of rein-forcement is the comparatively low electrical conductivity of concrete made with blast furnace cement. Because of their low heat of hydration, blast furnace cements help to prevent cracks in mass concrete structures resulting from temperature stresses at early ages. With increasing content of granulated blast furnace slag in cement, the content of capillary pores in the mortar matrix decreases and later age strength of the concrete increases. This provides greater reserves with respect to concrete durability.