activity 6 - the atlanticdurati.lnec.pt/pdf/workshop/novoa_presentation6.pdf · activity 6...
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Activity 6
“Green” and smart structural materials
repair products and systems
duratiNet
Investing in our common future
6th Transnational Workshop
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A6.1A6.1 Concrete mixes with subConcrete mixes with sub--products and recycled aggregatesproducts and recycled aggregates
(Univ. Bordeaux) (Fr)(Univ. Bordeaux) (Fr)
A6.2 A6.2 RebarsRebars more resistant to corrosion (SS, fibers) more resistant to corrosion (SS, fibers)
(Univ. Vigo) (Es)(Univ. Vigo) (Es)
A6.3 A6.3 Smart structural materials (Smart structural materials (Coatings,Coatings, Permanent monitoringPermanent monitoring) )
(QUB) (UK)(QUB) (UK)
A6.4 A6.4 New materials and systems for steel protection (New materials and systems for steel protection (new new
nanostructurednanostructured coatings and inhibitors)coatings and inhibitors)
(LNEC) (Port)(LNEC) (Port)
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ObjectiveObjective
Critical review on:Critical review on:
●● the use of the use of ““greengreen””concreteconcrete mixes for new or repaired structures.mixes for new or repaired structures.
●● the use of structural materials with improved durability. the use of structural materials with improved durability.
●● the use of intelligent structural materials with active propertithe use of intelligent structural materials with active properties.es.
(self cleaning concrete, coatings, permanent monitoring systems)(self cleaning concrete, coatings, permanent monitoring systems)
●● the use of more resistant reinforcement materials than carbon stthe use of more resistant reinforcement materials than carbon steel.eel.
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� Recycling construction demolition waste
(Define types and conditions)
� Incorporation of RM/Granite cutting slurries
(Additional research on mec. prop.)
�Incorporation of powder paint waste
(Define special application cases)
� Incorporation of C-fibres??? A6.4
A6.1A6.1 : : Concrete mixes with subConcrete mixes with sub--products and products and recycled aggregatesrecycled aggregates
(U. Bordeaux) LNEC, Nantes, La Rochelle, NRA(U. Bordeaux) LNEC, Nantes, La Rochelle, NRA
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RReduced consumption of:educed consumption of:cement, arid, watercement, arid, water
RRee--use of industrial wastesuse of industrial wastes
IIncreased service lifencreased service life
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1975 1980 1985 1990 1995 2000 2005 201010
20
30
40
50
60
Production of OPC in Spain
Pro
duct
ion/
tons
x 1
06
year
CaCO3 (> 75%)SiO2, Al2O3, Fe2O3
Clinker(1 ton ⇔⇔⇔⇔ 0.89 tons CO2)
Energy
0.35 tons CO2
Calcination
0.54 tons CO2
Reduced Consumption....Reduced Consumption....
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ReRe--use of industrial wastes....use of industrial wastes....
Replacement materialReplacement material(Demolition wastes)
Corrosion inhibitorsCorrosion inhibitors
Granite cutting slurries
Red Muds
Hungary, 2010-10-05
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“Healthy”rebar
● pH 11-13
● Low [Cl-]
● Low RH
● High Resistivity
Increased service life....Increased service life....
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“Ill”rebar
● Low pH (< 10)
● High [Cl-]
● High RH
● Low Resistivity
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● Green Inhibitors
● Stainless Steels
● Galvanised steel
MONITORINGRH, ρρρρ, Cl-
● Coatings
●Waterproofing
H2Ovap
H2Oliq.
Increased service life....Increased service life....
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� Stainless steels
(austenitic, ferritic: properties)
� AISI204Cu
(Study galvanic action vs. C-steel)
� Galvanised steel
(Analysis of critical cases)
� Fibres
(Review of types and special applications)
A6.2 A6.2 RebarsRebars more resistant to corrosionmore resistant to corrosion(Univ. Vigo) LNEC, LCPC, Nantes, NRA(Univ. Vigo) LNEC, LCPC, Nantes, NRA
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� SMART structures: Need for monitoring structural concrete fordurability and structural integrity
(Monitoring for durability & structural integrity)
� Use of permanent monitoring systems: Structural concrete
Electrical resistance
Fibre Optic
AC response and dynamic measurements
� Protective coatings to improve durability properties
Use of advanced nano materials
Use of conventional silane based protective coatings
A6.3 A6.3 Smart structural materials (coat., Smart structural materials (coat., monitmonit.).)(QUB) LNEC, LCPC, NRA(QUB) LNEC, LCPC, NRA
A6.4?
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Smart Bridge323 sensors
Cost: $233.8 M(sensors 1 M)
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� Chloride sensors
(durability, limits)
� pH
(durability)
� RH
(significance)
A6.3 A6.3 Smart structural materials (coat., Smart structural materials (coat., monitmonit.).)(QUB) (QUB) LNEC, LCPC, NRALNEC, LCPC, NRA
� Resistivity, Rp
(methods: ac, dc)
� Structural integrity
(dynamic)
� Others
contact-less
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Action 6.4 – New materials and systems for steel prote ction. Nanostructured coatings for steel protection
Main subjects identified:
�Green coatings� Low VOC coatings� Coatings with less polluting constituents (ex: additives, raw materials, chromates)
� Coatings with long-term performance� Recycling � Energy-efficiency coatings
�Smart coatings� Self-cleaning and anti-microbial coatings� Corrosion inhibitors realise or other nanoparticules that destroy aggressive chemical agents
� Coatings with color-changing compounds responding to changes that result from corrosion processes
� Coatings with "self-sealing" properties
Investing in our common future
6th
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7-09
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2011
duratiNet
Activity 6
“Green” and smart structural materials
repair products and systems