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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 Šavijab.savija@tudelft.nlMicrolab, CiTG, 6.05+31152788986