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19-04-2015 | ORIGINAL ARTICLE | Issue 1/2017

Journal of Material Cycles and Waste Management 1/2017

Influence of MSWI bottom ash used as unbound granular material on the corrosion behaviour of reinforced concrete

Journal:
Journal of Material Cycles and Waste Management > Issue 1/2017
Authors:
R. del Valle-Zermeño, E. Medina, J. M. Chimenos, J. Formosa, I. Llorente, D. M. Bastidas

Abstract

The reutilisation of MSWI natural weathered bottom ash (WBA) in many applications such as road and underground constructions, embankments or as an aggregate replacement is a common practice in many developed countries. Its potential environmental risk has regularly been evaluated from the point of view of the leaching of heavy metals and metalloids. Nevertheless, the influence over steel rebar when reinforced concrete is exposed to the contact with WBA has been poorly assessed before. In this study, it has been possible to evaluate in terms of days the probability of corrosion in a common case of WBA reutilisation, which is in contact with reinforced concrete formulated with conventional Portland cement. The corrosion monitoring indicates that the probability of corrosion of steel rebar is higher than 90 % with a corrosion rate (CI) estimated to be 11.6 µm year−1. The aggressive conditions imposed by WBA suppose an important withdrawal if the application of reutilisation involves contact with steel rebar.

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