Durability of Ternary Blended Cements Containing Limestone Filler and GBFS

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Title: Durability of Ternary Blended Cements Containing Limestone Filler and GBFS

Author(s): E.F. Irassar, V.L. Bonavetti, G. Menendez, H. Donza, and M.F. Carrasco

Publication: Special Publication

Volume: 234

Issue:

Appears on pages(s): 327-346

Keywords: blast-furnace slag; chloride penetration; compressive strength; drying shrinkage; flexural strength; hydration; limestone filler; sorptivity; sulfate performace; water absorption

Date: 3/22/2006

Abstract:
In this laboratory investigation, the effects of limestone fillerand granulated blast-furnaceslag (GBFS) additions on the mechanical and durable characteristicsof concrete areanalyzed.The evolution of compressive and flexural strength were determined and,waterabsorptionand sorptivity were used to characterize the permeability of concrete. The chloride penetration under continuous soaking was evaluated using the pounding tests and thesulfate resistance of cement was determined using ASTM C1012 test. The results show that, the complementary behavior of limestone filler and GBFS additions permits to obtainconcrete with strength development similar to portland cement with 35 % less clinker, andthe incorporation of GBFS into the mixtures prevents and improves the inadequateperformance of limestone filler cement in chloride and sulfate environments. Consequently,concretes made with ternary cement offer economic and ecological benefits, with similarstrength evolution and similar or better durable properties compared with binary and plainconcretes. However, to assure the reduction of permeability of concrete an adequate curedtime should be proportionate to assure the hydration progress.