22 - Other types of modifications of bitumen: CRMB, temperature reduction

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En provenance du cours de École des Ponts ParisTech

Mastering bitumen for better roads and innovative applications

85 notes

École des Ponts ParisTech

Mastering bitumen for better roads and innovative applications

85 notes

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.

À partir de la leçon

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

Rencontrer les enseignants

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

[MUSIC]

Dear participants, hello.

It's my pleasure to meet you again in this technical session.

Today we'll present some modifications of the bitumen and why they are used.

We have seen in the previous video, presented by Jill Gotye,

that it's possible to modify the bitumen's characteristics.

The addition of polymer is a one polymer modification of the bitumen.

In this video I will focus on the modification of bitumen with crumb rubber

And on the additivation of bitumen to decrease the working temperature.

First, I will present the modification with crumb rubber.

Bitumen is a viscoelastic material with suitable properties for paving and

roofing applications.

However, with the increased traffic volumes and vehicles loads,

there is a need to improve conventional bitumen properties especially

the resistance to permanent deformation and the resistance to cracking.

The [INAUDIBLE] is s-polymers are the commonly

used polymers to improve the elasticity in the cohesion of the vitamin.

The substitution of this virgin polymers by recycled polymers

has been taken into consideration.

In order to reduce the modification cost and obtain environmental benefits.

Thus particles of crumb rubber made with recycled bits of tires

can be used in the polymer to increase its elastic properties and cohesion.

Bitumens modified with crumb rubber are usually called CRMB.

Crumb Rubber Modified Bitumen, the CRMBs are cheaper alternative to PMBs.

For example, India is a significant user of CRMB.

To manufacture CRMB, fine crumb rubber is added and

dispersed in the bitumen Using your high share blender.

Your tense CRMB may contain up to 25 percent of crumb rubber and

display enhanced performances,

which may be seen as up to 1.5 percent of the asphalt mixture.

The CRMB's are well known to be not very stable during the storage at high

temperature.

In Europe there is no specific standard for CRMB.

In fact, the use of that product falls

under EN 14023, framework specification for polymer modified bitumen.

The crumb rubber can also be incorporated directly into the mixed plant.

What aggregates filler and sand.

The warm mix asphalts are a relatively recent technique developed in

response to the needs of the road industry for

decreasing energy consumptions and emissions and worker's exposure.

In France, for example, the French world companies signed in

March 2009 an agreement of voluntary commitment with the Ministry of Ecology,

Energy, Sustainable Development in the town and country planning.

In which they make in particular a commitment to reduce greenhouse

gas emissions of the order of 33% to the recent in 2020,

leading to use of warm mix asphalts.

There are two main ways to manufacture warm mixes.

First is the bitumen foam and a course solution is injected in the hot bitumen.

Just before the mixing with the aggregates at warm temperature about 120 degrees

celsius, 140 degrees celsius the bitumen expansion, due to the water expansion,

improves the uncoating of the aggregates at lower temperature.

The second one is the additivation of the bitumen with specific additives.

This additivation aims at getting the same workability of the asphalt mix

at lower temperature.

Studies carried out in Europe and in the United States show that these

techniques to indeed did a lot to reduce the energy consumption up to 35% and

to reduce CO2 emissions up to 40% Moreover

workers operating improved working conditions with less exposure to fumes.

There are other benefits which are not environmental or safety and

health oriented, but would direct added value for the customer's business.

Lower temperature means, Quicker cooling and so allows opening the traffic earlier,

applying several layers in a row and even extension of the working seasons.

In conclusion, chrome rubber can be added to the bitumen to enhance the properties

of the mix like resistant to permanent deformation and resistance to cracking.

CRMB is a cheap alternative to PMBs, but it's not so

stable during a storage at high temperature as PMBs are.

Warm mix asphalt can be manufactured using bitumen foam or

bitumen additive rated with specific additives.

This technique allows reducing the energy consumption and

the emissions and improving the workers comfort on the job site.

Thanks for your attention.

[MUSIC]

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