21 - Polymer modified bitumens

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来自 École des Ponts ParisTech 的课程

Mastering bitumen for better roads and innovative applications

80 个评分

École des Ponts ParisTech

Mastering bitumen for better roads and innovative applications

80 个评分

During the four coming weeks, best experts in bitumen will bring you their knowledge and experience to build a strong understanding of today’s realities and new perspectives on the future of bitumen. Total is the European leader on bitumen markets. Innovation has always been the key to sustainability and durability in the products they develop. Their main objective here is to share technical knowledge and experience to insure bitumen are being used in the most effective and efficient ways for their different applications in road works. Ecole des Ponts, France oldest engineering school, remains very much in the present, as it has always been, in training engineers in order to meet the needs of our society and citizens in key areas such as transport housing and urban services, but also in fields like energy, environment, climate sciences, land-use planning and sustainable development. Nineteen world recognized experts on bitumen are contributing to this MOOC. The idea is to provide the broadest prism on this topic area with speakers coming from research, industry and end users.

从本节课中

Modifications of bitumen and applications (roads, roofing,…)

Modifications using polymers. Performance of PmB. Elastic recovery test. | of types of modifications of bitumen: CRMB, warm mix asphalt, temperature reduction | Bitumen emulsions, their components, manufacture, storage, handling, properties, classification, uses | surface treatments | design of pavements and types of aggregates | fundamental tests, the simulative tests (fatigue test, rutting test, giratory compactor,…) | interest of full scale testing of asphalt mix: example of IFSTTAR carousel | Hot mix plants, transport, laying and compaction of asphalt mix | physical characteristics and industrial applications for sealing.

21 - Polymer modified bitumens8:00

22 - Other types of modifications of bitumen: CRMB, temperature reduction6:15

23 - Bitumen emulsions9:45

24 - Surface treatments7:44

25 - Understanding design of flexible pavements and types of aggregates7:59

26 - Laboratory testing of asphalt mix9:06

27 - Full scale testing of asphalt mix: IFSTTAR carousel6:44

28 - Hot mix plants, transport, laying and compaction of asphalt mix6:52

29 - Roofing applications of bitumen - other binders and uses (clear binders,...)5:23

与讲师见面

Eric GOSSE
Vice Président
TOTAL MARKETING SERVICES
Armel de la BOURDONNAYE
Directeur
ECOLE DES PONTS PARISTECH
Sophie LIMBORG
Mission Head
TOTAL MARKETING SERVICES
Mike SOUTHERN
Director
Bituconsult LTD
Clémence QUEFFELEC
Assistant professor
CEISAM laboratory, University of Nantes, France
Gilles GAUTHIER
Technical and Product development manager
TOTAL BITUMEN
Olivier GAMET
Production Pilot
Supply department / TOTAL
John D'ANGELO
Chief Operating Officer
D’Angelo Consulting, LLC.
Gary SCHOFIELD
Technical Manager
Total Bitumen (UK)
Nicolas HAUTIERE
Project Director
IFSTTAR / COSYS Department
Frédéric ANDRZEJEWSKI
Expert bitumen industrial roofing activity
Jean Pascla PLANCHE
Vice President
Asphalt and Petroleum Technologies / Western Research Institute
Virginie MOUILLET
PhD, Senior Researcher, deputy head of chemical Unit
Regional Laboratory of Aix-en-Provence / Cerema Méditerranée
Hélène AZOULAY
Deputy Managing Director
PFC/Ecole des Ponts
Nadège VO VINH
Bitumen Shipping Manager
Supply International Bitumen / TOTAL MARKETING SERVICES
Cécile GIACOBI
Pavement expert
Vinci Autoroutes
Laurence LAPALU
Bitumen Group Manager
TOTAL MARKETING SERVICES - Research Division
Yves BROSSEAUD
senior researcher - road materials expert - materials and Structures Department
IFSTTAR - Nantes - France
Emmanuel CHAILLEUX
Research Director
IFSTTAR
Jean-François CORTE
Member of the Council of Environment and Sustainable Development
French Ministry of Environment, Energy and Sea

Hello, my name is Gilles Gauthier.

I'm responsible for the technical coordination and

product development at Total Bitumen.

Let's start with the modification of bitumen with polymers.

In this video, you will find information about the different types

of polymers that can be used, and the benefits of polymer-modification.

Polymer-modified bitumen or PMBs,

generally consists of a blend of a bitumen with a polymer.

Polymers are large molecules composed by the addition

of many small molecules called monomers into a chain.

Two different types of monomers can be combined into a single polymer,

which is then called a copolymer.

The most common type of polymer used to modify

bitumen is a copolymer of polystyrene and polybutadiene.

It is usually called SB or SBS.

This family of copolymers is called an elastomer because it brings viscosity and

elasticity to the bitumen.

More than 80% of polymers used in bitumen are SB or SBSs.

But there is another type of polymer that can be used in the bitumen industry.

It is a copolymer of polyethylene and polyesters like, for instance,

vinyl acetate.

This family of copolymers is called a plastomer because it brings stiffness and

plasticity to the bitumen.

There are many different grades of SBS and plastomers that are suitable for

bitumen modification.

They differ by their properties like, for instance: molecular size,

ratio between copolymers, molecular structure.

These parameters impact the mechanical properties of the polymer, and

therefore the properties it will bring to polymer-modified bitumen.

Now let's focus of the main properties brought

by the polymer-modification of bitumen:

Polymer modification stiffens of bitumen at elevated service temperatures,

say around 50 to 70°C.

PMBs have higher Ring&Ball temperature and

are less sensitive to creep.

The resulting asphalt mix will have an improved resistance to rutting or

permanent deformation.

At very low temperatures, PMBs are less stiff and

more flexible than regular bitumen.

They have a lower fraass point and a higher toughness.

It makes polymer-modified asphalt mixes more resistant to thermal cracking.

In other words, PMBs are less sensitive to extreme temperatures.

They can be used on a wider range of temperature compared to regular bitumen.

- Polymer modification improves binder cohesion.

At low and intermediate temperature, bitumen may be too brittle.

Under traffic the film of bitumen hold the aggregates together may break,

causing the aggregates to come off.

This phenomenon is called raveling.

PMB have increased cohesion energy:

It requires much more energy to break because of their high elasticity or

plasticity.

As a consequence the asphalt mix will be much less sensitive to raveling.

SBS modified bitumen are typically more viscous than regular bitumen.

This may become a problem if the viscosity is too high,

because the product can no longer be pumped or it will not coat

the aggregates properly, or the asphalt mix can no longer be fully compacted.

On the other hand plastomer-modified bitumen are much less viscous.

Polymer modification improves the binder resistance to aging.

Bitumen on the road is subjected to aggressive climatic conditions like

oxidation by air, UV light, water, changes in temperatures...

All this combined with traffic loads.

Over time the bitumen tends to stiffen and come more brittle.

In the case of PMB, this aging phenomenon is mitigated,

which brings some extra durability to the pavement.

Finally, polymer modification improves the resistance to fatigue.

Fatigue is the development of cracks by the repetition of loading cycles.

It is responsible for the failure of many pavements!

PMBs are more resistant to fatigue.

They develop damage at a slower pace,

bringing extended lifespan to the pavement.

Now you now the main properties of PMBs.

We will now see more specific PMB technologies also available on the market.

The first one is crosslinked PMBs.

The crosslinking technology is based on the modification of the polymer structure

in the bitumen matrix by adding a crosslinking agent

and creating bonds between the polymer chains.

The outcome is a complete change of the PMB microstructure,

becoming completely homogeneous.

This technology has been patented by Total in 1978 and

is widely renowned under the brandname Styrelf

with three hundred thousand tons sold each year by Total and its licensees over the world.

As a consequence, the PMB receives additional outstanding

properties of elasticity, resistance to fatigue,

raveling, and temperature susceptibility.

PMB are essentially a suspension of swollen polymer particles inside

a bituminous matrix.

This suspension is not always stable and in some cases the polymer

tends to separate from the bitumen within a few hours.

It is necessary to stir such blends continuously to ensure proper homogeneity.

On the other hand, crosslinked PMBs are also naturally storage stable for months.

Another technology is offered by reactive terpolymer.

Some advance plastomers are available on the market.

These polymers are modified with a special chemical containing an epoxy component.

This plastomer is more stable in bitumen and

brings higher elasticity and extra stiffness to the PMB.

Now, let's summarize what you have learnt about polymer-modified bitumen:

Polymers used to modify bitumen are either elastomers,

typically SBS polymer, or plastomers, typically polyethylene copolymers.

PMBs have improved mechanical properties compared to regular bitumen.

These properties include lower temperature susceptibility,

resistance to fatigue, lower aging, and high cohesion.

Finally, Cross linking allows to further improve

the performance of SBS modified bitumen.

I thank you for your attention.

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