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Experimental and numerical investigation of chloride ingress in cracked concrete
Experimental and numerical investigation of chloride ingress in cracked concrete
Branko Šavija
PERSPECTIEF Program IS2C “Integral Solutions for Sustainable Construction”
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Experimental and numerical investigation of chloride ingress in cracked concrete
Chloride ingress in cracked concrete (M3C4)
PhD 1Cl transport in
cracked concrete
PhD 3Corrosion initiation
and propagationnear cracks
PhD 2Non-destructive, real-time
transport of Cl, H2O, Na
structure
PhD 1Cl transport in
cracked concrete
PhD 3Corrosion initiation
and propagationnear cracks
PhD 2Non-destructive, real-time
transport of Cl, H2O, Na
structure
B. Šavija
J. Pacheco
J. Han
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Experimental and numerical investigation of chloride ingress in cracked concrete
• Maintenance costs are increasing• Expensive remedial or repair works performed sooner than expected.• (Reinforced) concrete is the most commonly used construction material in severe environmental conditions (e.g. marine environment, cold/hot climates, etc.)• Infrastructures (now) expected to have 100 (150) years service life!
Durability of concrete infrastructure is a major issue because:
• Reliable service life prediction models are needed!
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Experimental and numerical investigation of chloride ingress in cracked concrete
Cracking
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Experimental and numerical investigation of chloride ingress in cracked concrete
Controlled crack preparation:
Modified wedge splitting test (MWST)
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Experimental and numerical investigation of chloride ingress in cracked concrete
LIBS (Laser-induced Breakdown Spectroscopy):
• Chloride mapping (also for other elements)
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Experimental and numerical investigation of chloride ingress in cracked concrete
Element maps by LIBS (slag) 1/2:
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Experimental and numerical investigation of chloride ingress in cracked concrete
Element maps by LIBS (slag) 2/2:
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Experimental and numerical investigation of chloride ingress in cracked concrete
Self-healing of cracks:
Could influence chloride penetration, but depends on the environment, crack width, and possibly concrete composition.
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Experimental and numerical investigation of chloride ingress in cracked concrete
Numerical modeling of chloride ingress
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Experimental and numerical investigation of chloride ingress in cracked concrete
Chloride induced corrosion – the real problem!:
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Experimental and numerical investigation of chloride ingress in cracked concrete
Chloride induced corrosion – how to monitor?:
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Experimental and numerical investigation of chloride ingress in cracked concrete
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Experimental and numerical investigation of chloride ingress in cracked concrete
Cracking of the concrete cover due to reinforcement corrosion
Concrete as a heterogeneous materialAnm material model (Qian 2012)
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Experimental and numerical investigation of chloride ingress in cracked concrete
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Experimental and numerical investigation of chloride ingress in cracked concrete
General conclusions:
• Cracking has a marked influence on chloride ingress in concrete
• Self-healing of cracks has potential to slow down chloride ingress in cracks
• Fine-scale numerical modeling provides a step forward in understanding complex phenomena such as chloride ingress and corrosion induced cracking of concrete
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Experimental and numerical investigation of chloride ingress in cracked concrete
Recommendations for future work:
• Test other concrete types and/or loading conditions
• Testing of coupled degradation (e.g. chloride + freeze/thaw)
• Extend the model for non-lab conditions and coupled deterioration
• Model ingress of other species too
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Experimental and numerical investigation of chloride ingress in cracked concrete
Branko Š[email protected], CiTG, 6.05+31152788986