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Du er her: DBR > Transport and Corrosion Behavior of Cracked Reinforced Concrete

Transport and Corrosion Behavior of Cracked Reinforced Concrete

Title:
Transport and Corrosion Behavior of Cracked Reinforced Concrete

Type of project:
PhD.–project

Responsible part:
DTU, Dept. of Civil Engineering

Description:
Lifetime modeling of reinforced concrete (RC) structures has until now concentrated on deterioration mechanisms of uncracked concrete.  While the potential benefits of performance modeling are becoming more realized by the civil engineering community, these models currently lack some of the scientific validity to fully represent actual field structures.  One area in which further understanding is needed is the behavior of reinforced concrete when cracking occurs.  Concrete cracks form through various physical and chemical processes occurring at varying periods of the lifetime of a structure, resulting in varying crack parameters (i.e. width, depth, and tortuosity).  Cracking enables aggressive substances from the environment to enter the concrete.  This is, among others, important in the corrosion of reinforcing steel.  When cracks protrude to the depth of reinforcing steel, liquids containing aggressive ions (i.e. chlorides associated with salts and sea water) may rapidly access and initiate corrosion of the reinforcing.  

The fundamental mechanisms of transport and corrosion in cracked, reinforced concrete are not yet fully understood.  As a result, this study will attempt to determine a link between concrete cracks and the relevant transport mechanism(s).  It is envisioned that a finite element model will be developed which estimates the ingress of aggressive substances by relating crack parameters and environmental conditions to transport mechanisms.

Furthermore, the subsequent corrosion behavior of reinforcing steel will be characterized to determine how cracking influences the corrosion initiation and propagation in cracked RC structures.

Project period:
August 2005 – December 2008

Participants:
DTU, Dept. of Civil Engineering
Purdue University, Dept. of Civil Engineering

Link:
www.byg.dtu.dk

Relation to the Danish Concrete Counsel focus areas:
1. Efficiency and economics  x
2. Aesthetics, function, and flexibility  x
3. Environment, work environment, and indoor climate
4. Recruitment, education, and R&D