c. mancero, s. biro, c. thodesen: using crumb rubber modifier to meet demand in high performance...

8/14/2019 C. Mancero, S. Biro, C. Thodesen: Using Crumb Rubber Modifier to Meet Demand in High Performance Asphalt

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International

Road FederationBetter Roads, Better World

www.irfnews.org

Using Crumb Rubber Modifierto Meet Demand in High

Performance Asphalt

Cecilia Mancero, Szabolcs Biro

& Carl Thodesen

ECOPATH Industries


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CRM binders Crumb rubber modified binders are NOT all

the same.

They can satisfy differentstandards/requirements by changing the

production parameters and raw materials

(asphalt, rubber, additives).


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www.irfnews.orgTemperature,

oC

0 20 40 60 80 100

Ela

sticityindicato

r(tan

)

0

1

2

3

4

5

6

7

8

AZ

CA

FL

SC

TX

CRM Binder vs. CRM Binder


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www.irfnews.orgTemperature,

oC

0 20 40 60 80 100Ruttingpo

tentialindicat

or(G*/sin,

Pa

)

1e+2

1e+3

1e+4

1e+5

1e+6

1e+7AZ

CA

FL

SC

TX



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Vehicle speed indicator (Frequency, rad/s)

0.01 0.1 1 10 100 1000Ruttingpo

tentialindicator(G*/sin,

Pa

)

1e+1

1e+2

1e+3

1e+4

1e+5

1e+6

AZ

CA

FL

SCTX

Neat binder



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CRM binder Not just the rubber concentration, gradation, but

chemical composition has an effect.

Importance of asphalt chemical composition.

CRM binder formulation is needed to obtain the

best result & reduce cost.

Thin layers can be constructed because of improved

binding properties.


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Thinner Overlays


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www.irfnews.orgTime, s

0 10 20 30 40 50 60

Strain,%

0

5

10

15

20

CRM-AZ

Elvaloy

EVASBS+CRM

SBS+PPA

SBS

Elasticity


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Time, s

0 20 40 60 80 100 120

Strain

0

20

40

60

80 AR (AZ)

Elvaloy

EVA

Hybrid

SBS_PPA

Elasticity

70oC, 3200Pa


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CRM vs. other modifiers

Crumb rubber modified binders can be both technically

and economically a good substituent for SBS and other

elastomer/plastomer modified asphalts.


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Overhead View of Plant Site


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Modified Asphalt Blending Equipment

15-20 TPH Blending System


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Projects

Less than ideal roadway condition


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10.6 miles (19.4 km)

58,250 Mix Tons

1,140 Tons Crumb Rubber

Arizona

i l


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4.3 Miles

9,200 Mix Tons

190 Tons Crumb Rubber

Biosphere 2

Tucson, Arizona

I i l


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Pulliam Airport

Flagstaff , Arizona

I i l


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New Jersey / I-95 Before


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I t ti l


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I-95 During Construction

I t ti l


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After Construction

I t ti l


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Washington State

I t ti l


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Quiet Pavement Project in DOT en

Washington State

International


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Spain

International


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Siberia

International


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Siberia

International


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Conclusions Crumb rubber improves asphalt binder properties.

Not all crumb rubber modified asphalt (CRMA)

are the same.

CRMA can substitute and compete with other

modifiers if right formulation is applied (raw

materials + production parameters).

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Conclusions CRMA have better elastic (shear) characteristic

than most of the common asphalt modifiers.

Out of the common crumb rubber modified

asphalts, Arizona style has the best performance

(except aging, where California style AR is the

best).

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Conclusions ECOPATH has become a leader in the

industry and provides asphalt binder

formulation to reduce cost and optimize

performance.


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Conclusions SAVES MONEY!

Initial investment Life cycle costs

Noise abatement alternatives

FEWER TRAFFIC INTERRUPTIONS! Extends pavement life 15+ years

SAVES LIVES! Greatly improves driving conditions

IMPROVES QUALITY OF LIFE! Reduces traffic noise Eliminates waste tyres

NO RISK! 20+ yrs of proven technology in all types of climates

c. mancero, s. biro, c. thodesen: using crumb rubber modifier to meet demand in high performance...

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