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The relation between concrete crack width and rebar corrosion level validated on a large set of experimental data

Boekbijdrage - Boekhoofdstuk Conferentiebijdrage

Reinforced concrete (RC) structures are subject to various degradation mechanisms, including reinforcement corrosion which impacts durability and structural safety. The effects of corrosion of reinforcing steel include a local reduction of the rebar’s cross-section and the formation of rust. As corrosion products occupy a greater volume than steel, this leads to internal stresses, concrete cracking, and eventually spalling. The condition assessment of RC structures is often based on visual inspections, accompanied by hammer tapping and crack mapping. Consequently, crack width measurements serve as an important damage parameter and can be related to rebar corrosion level. However, no unambiguous relation has been established that is generally valid within certain modeling error limits for all types of layout cases. In the present paper, the available empirical models which have been used to describe the relation between concrete crack width and rebar corrosion level are discussed and their applicability is validated on a large set of experimental data. The experimental data are obtained from various accelerated corrosion test programs at the Reyntjens laboratory of KU Leuven on RC specimens with varying dimensions, reinforcement layout, concrete cover thickness, reinforcement type and rebar diameter. The aim of this research is to analyse the modeling error of the empirical relations in view of RC component layout including cover depth, rebar diameter and to investigate whether extrapolation towards other layout cases would be permitted within certain modeling error limits. Finally, the obtained empirical models are compared and classified according to their validity and modeling error.
Boek: Concrete Innovation for Sustainability
Pagina's: 2160 - 2169
Aantal pagina's: 10
ISBN:978-2-940643-15-8
Jaar van publicatie:2022
Toegankelijkheid:Open