Activity 6 - The Atlanticdurati.lnec.pt/pdf/workshop/Novoa_presentation6.pdf · Activity 6...

Investing in our common future

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Activity 6

“Green” and smart structural materials

repair products and systems

duratiNet


6th Transnational Workshop

Nantes, 07-09/07/2011

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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Nantes, 07-09/07/2011

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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Nantes, 07-09/07/2011

� 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

duratiNet



Nantes, 07-09/07/2011

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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Nantes, 07-09/07/2011

“Healthy”rebar

● pH 11-13

● Low [Cl-]

● Low RH

● High Resistivity

Increased service life....Increased service life....

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Nantes, 07-09/07/2011

“Ill”rebar

● Low pH (< 10)

● High [Cl-]

● High RH

● Low Resistivity

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Nantes, 07-09/07/2011

● Green Inhibitors

● Stainless Steels

● Galvanised steel

MONITORINGRH, ρρρρ, Cl-

● Coatings

●Waterproofing

H2Ovap

H2Oliq.

Increased service life....Increased service life....

duratiNet



Nantes, 07-09/07/2011

� 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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Nantes, 07-09/07/2011

� 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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Nantes, 07-09/07/2011

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


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duratiNet

Activity 6

“Green” and smart structural materials

repair products and systems

Activity 6 - The Atlanticdurati.lnec.pt/pdf/workshop/Novoa_presentation6.pdf · Activity 6...

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