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51318-11580-Corrosion Macrocell Development in Dissimilar Repair Concrete Utilizing UHPC for Marine Bridges

In this study, the extent of macrocell development between UPHC as are pair material for reinforced concrete marine bridges.

Product Number: 51318-11580-SG
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Reinforced concrete marine bridges are susceptible to corrosion. In conventional repair, a structurally damaged element is often restored with repair patches.  Due to the presence of lo-level chlorides in the remaining concrete, incipient anodes can develop and lead to the halo effect which is the main reason of short-lived repair.  Ultra-high performance concrete (UHPC) has been promoted as a durable construction material that can provide a barrier to corrosion due to its low permeability, ideally resulting in a durable repair solution with no need for any other corrosion control systems. Other material conditions afforded by UHPC such as concrete resistivity, internal moisture and oxygen availability will influence the level of the galvanic coupling between steel in the dissimilar UPHC repair material and the existing concrete with vestigial low-level chloride concentrations.  In this study, the extent of macrocell development between UPHC as are pair material for reinforced concrete marine bridges.

Key words: Repair, UHPC, macrocell development, halo effect, durability resistivity, oxygen diffusivity, internal humidity.

 

Reinforced concrete marine bridges are susceptible to corrosion. In conventional repair, a structurally damaged element is often restored with repair patches.  Due to the presence of lo-level chlorides in the remaining concrete, incipient anodes can develop and lead to the halo effect which is the main reason of short-lived repair.  Ultra-high performance concrete (UHPC) has been promoted as a durable construction material that can provide a barrier to corrosion due to its low permeability, ideally resulting in a durable repair solution with no need for any other corrosion control systems. Other material conditions afforded by UHPC such as concrete resistivity, internal moisture and oxygen availability will influence the level of the galvanic coupling between steel in the dissimilar UPHC repair material and the existing concrete with vestigial low-level chloride concentrations.  In this study, the extent of macrocell development between UPHC as are pair material for reinforced concrete marine bridges.

Key words: Repair, UHPC, macrocell development, halo effect, durability resistivity, oxygen diffusivity, internal humidity.

 

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