GARY SCHOFIELDTECHNICAL MANAGERTOTAL BITUMEN

Flexibility on UK roads, Polymer Modified Bitumen Technology

STYRELF

PRESENTATION OUTLINE

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What are Polymer Modified Bitumens?

Are PMB’s all the same?

What is Styrelf?

What can Styrelf offer to asphalt performance?

Are these materials Durable?

What is the impact on Asset Management?

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Bitumen is an engineering product with good adhesion and good waterproofing properties

It has inherent limitations to it’s performance because of how it behaves

At all temperatures, bitumen shows both liquid and solid behaviour

Depending on the local conditions, there is a competition to find which characteristic will take precedence

What are Polymer Modified Bitumens?

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Increasing temperature means the bitumen takes on more liquid behaviour

Decreasing temperature means the bitumen takes on more solid or stiff nature

The challenge is to spread the temperature range we are getting “good performance”

Also to improve the performance in the “good temperature” range

Temp

Too Brittle

Good performance

Too soft

Temp

Too Brittle

Good performance

Too soft

Enhanced performance

What are Polymer Modified Bitumens?

Addition of polymer units to the bitumen

Range of different polymer types

Most Common are SBS elastomers

Elastomeric Polymers bring additional cohesion

Improve strength, fretting resistance, deformation resistance, fatigue.......

What are Polymer Modified Bitumens?

SIS

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Are PMB’s all the same?

Most production methods are a dispersion of Polymer units in Bitumen

Performance is dependant on Bitumen type and grade, polymer type, polymer size, quality of dispersion etc

Consider the Lavoc Study

PMB’s performed completely differently

Some not as good as penetration grades

NOT ALL PMB’S ARE THE SAME

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What is Styrelf?

Styrelf has an additional manufacturing step which “Cross-Links” the polymer units

In other words the polymers become networked and act as a single unit

Styrelf technology has been around for decades, but has evolved and been “tweaked” and improved.

Worldwide there have been tens of millions of tonnes supplied

Excellent reputation and many high profile case studies

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What can Styrelf offer to asphalt performance?

Because of it’s manufacturing control, Styrelf is extremely storage stable

High levels of elastic recovery impart good resistance to dynamic creep

Also resistance to reflective cracking created by thermal expansion joints

Fatigue resistance improves

Good resistance against segregation in transportation and application

Great durability record

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Are these materials Durable?

The Lavoc study has illustrated the durable nature of the Styrelf binders

Also practical evidence in Germany where bridges were surfaced with Styrelf based asphalt

First Tarmac trials using Styrelf eXtreme 50 where Masterlayer was applied in Durham over poor substrate. Expectation was for cracking to show through within weeks or months

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What is the impact on Asset Management?

Through collaboration and exchange, we can work together....through the supply chain to optimise the approach to design

The Total Styrelf materials provide top drawer performance. Combined with optimised asphalt design, optimised application control and suitable specification, impact on Asset Management can be significant

The best way to sustainability is do a job right, first time and build to last.

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Conclusion

Total Styrelf binders have a well earned reputation for performance and durabilty, gained over many years experience

The cross linking technology enhances performance in many areas

The Total Styrelf range of binders will continue to develop according to the specific requirements of the client