Long-Term Influence of Fly Ash on Chloride-Induced Corrosion

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Title: Long-Term Influence of Fly Ash on Chloride-Induced Corrosion

Author(s): Peter SchieBl and Udo Wiens

Publication: Special Publication

Volume: 170

Issue:

Appears on pages(s): 1-22

Keywords: Blast-furnace slag; chlorides; concrete; corrosion; diffusion; durability; fly ash; porosity.

Date: 7/1/1997

Abstract:
The durability of reinforced concrete structures has been acquiring an increasing degree of emphasis in research activities. The development of concrete mixtures with regard to different attacks imposed on concrete structures by climatic influences plays a decisive role in this context. Under certain conditions, the performance of these concretes can be increased by using pozzolanic additions, such as fly ash or blast-furnace slag, as cementitious components. This publication intends to summarise the influence of these cementitious components on important processes contributing to chloride-induced corrosion. Diffusion and corrosion cells were used to examine the diffusion resistance and corrosion rate of mortars and concretes containing up to 60 mass.% of fly ash and up to 75 mass.% of blast-furnace slag in relation to the total content of cementitious binders. The results of pore structure investigations were also employed in order to clarify the influence of these cementitious components on ion transport in the microstructure of the concrete.