8/14/2019 C. Thodesen, S. Biro: Using Crumb Rubber Modifier to meet US Demand in High Performance Asphalt
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Using Crumb Rubber
Modifier to meet USDemand in High
Performance Asphalt
Dr. Carl Thodesen
and
Dr. Szabolcs Biro
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Introduction
Continuously analyzing market and needs.
Predicting future trends
Remedy problems.
Developing new products and formulas tosatisfy all needs (climate, country) on themost efficient ways.
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Current Market
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Current Market
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Current Market
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Current Market
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Current market andsituation
Large part of the marketaccessible only through modifier.
SBS most widely used modifier.
Prudent planners should beworking on the basis that theavailability of SBS polymer will
be tight in the immediate future SBS Polymer supply outlook (August 6. 2008)
Different countries have differentraw materials.
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Different solutions
Different countries and climaticzones require different propertymaterials.
There is no universal solution.
Maximum flexibility in
production is required.
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Recommendations Adopt appropriate modification
depending on climate (can bedifferent in one country).
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Potential Issues
SBS supply beginning to tighten
Environmental legislation
promoting use of recycledresources
Price variations causing state
agencies to consider otheroptions
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AMAP Recommended
Solutions Reacted Ethylene Terpolymer (Elvaloy)modified binder.
Ethyl Vinyl Acetate (EVA) modified
binder. Polyphosphoric Acid (PPA) + SBS
modified binder.
Crumb Rubber (CRM) modified binder.
Hybridized binders (SBS + CRM).
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Elasticity
Time, s
0 10 20 30 40 50 60
Strain,
%
0
5
10
15
20
CRM-AZ
Elvaloy
EVA
SBS+CRMSBS+PPA
SBS
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Our findings
Crumb rubber modified bindercan be both technically andeconomically a good substituentfor SBS modified bitumens.
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CRM Binder
Crumb rubber modified bindersare NOT the same.
They can satisfy differentstandards/requirements bychanging the productionparameters and raw materials(bitumen, rubber, additives).
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CRM Binder vs. CRM binder
Temperature, oC
0 20 40 60 80 100
E
lasticityindicator(tan
)
0
1
2
3
4
5
6
7
8
AZ
CA
FL
SC
TX
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CRM Binder vs. CRM binder
Temperature, oC
0 20 40 60 80 100Ruttingpotentialindic
ator(G*/sin,
Pa)
1e+2
1e+3
1e+4
1e+5
1e+6
1e+7 AZ
CA
FL
SC
TX
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CRM Binder vs. CRM binder
Vehicle speed indicator (Frequency, rad/s)
0.01 0.1 1 10 100 1000Ruttingpotentialindic
ator(G*/sin,
Pa)
1e+1
1e+2
1e+3
1e+4
1e+5
1e+6
AZ
CA
FL
SC
TXNeat binder
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Properties of CRM
binders Not just the rubber concentration,gradation, but chemicalcomposition has an effect.
Importance of asphalt chemicalcomposition.
CRM binder formulation is
needed to obtain the bestresult.
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CRM Binder
We recall that PG 76 and PG 70are the most used binders in theUS.
Crumb rubber can be used toproduce these binders.
Many specifications achievedwith SBS are possible usingcrumb rubber.
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SBS vs. CRM Binder
New generation of blendingequipment are needed toprovide maximum productionflexibility.
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Conclusions
Polymer modified binder a growingindustry.
Reduced lifecycle cost makes this
binder more attractive option fordepartments of transportation.
SBS has been market leader to date.
Butadiene supply issues couldbecome an issue.
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Conclusions
Crumb rubber is proven to be agood solution for substituting SBS.
There are significant differencesbetween the performance ofcrumb rubber modified binders.
There is no universal solution,
binder formulation is needed.
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Conclusions
Engineering expertise.
High flexibility in production is
required. Right selection of raw materials.
Crumb rubber producers could
have an effect on better, andconstant quality.
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