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GASTALDINI, A. L. G.; ISAIA, G. C.; ZANELLA, R. Chloride permeability of high performance concrete with mineral addition: binary and ternary mixtures. In: INTERNATIONAL CONFERENCE ON HIGH- PERFORMANCE CONCRETE, AND PERFORMANCE AND QUALITY OF CONCRETE STRUCTURES, 2., 1999, Gramado. Anais… Gramado, 1999.
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Abstract

One of the main causes of the deterioration of concrete structures is the action of chloride ions. Chloride penetration in concrete depends on its composition and execution procedures. Mineral additions play an important role because they significantly modify the paste microstructure. The purpose of this paper is to study chloride penetration in concrete in the presence of mineral addition (fly ash, rice husk ash, silica fume, and blast furnace slag), in binary and ternary mixtures. The following determinations were carried out: compressive strength, chloride penetration, porosity, and concentration of Na + , K + and Ca ++ ions in the pore solution. It was observed that there was a reduction in the chloride penetration and pore refinement due to both the evolution of cement hydration, and the partial replacement of cement by mineral addition. It was also found a relationship between the total volume of mercury intrusion and the chloride penetration, based on electrical conductivity measurements. However, the increase in the fineness of the blast furnace slag (from 400 m 2 /kg to 700 m 2 /kg), resulted in a higher compressive strength and a higher pore refinement but not in a lower chloride penetration. This unexpected could be related to an alteration in the composition of the aqueous pore solution since the increase in the slag fineness resulted in a higher concentration of Na + and K + ions, and this could justify the increase in electrical conductivity. However, new test must be carried out to confirm those surprising and unexpected results.
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