Recycle as a Resource

7/25/2019 Recycle as a Resource

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April 2012

!"#$#%" '( ' !"()*+#"

Benefits, Performance, and Equipment Technology


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Value of RAP

Performance of RAP Mixes

Equipment Technology and Processing

,)-.#(/


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01'2 3)"( 4!5567"'89

Conserving our resources

Reducing energy cost

Reducing Greenhouse Emission

Being more environmentally friendly

And building a better, longer-lasting pavement

:;> ?@,,>5


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6A, @ 0@B,5

!@; =B @ !5BA:!C5


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Rock Quarry+

Oil Well

Rock Quarry

+Oil Well

B*(2'.8'D.%.2$


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RAP is worth the virgin material it replaces

6% Bitumen

morethan

^


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Why?

!"#$#%" 7'E"( ' D"22"+ +)'3


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Overlays canexperience cracksand rutting

Milling and inlaysprevent re-rutting

;'F"7"82 G*'%.2$ =((*"(


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Milling ensures consistentpaving density

No shoulder or guardrailchanges with milling

;'F"7"82 G*'%.2$ =((*"(


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01'2 'D)*2 7.H

-"+I)+7'8#"9


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J"#1'8.#'% K)'7.8L

Uses water (steam bubbles) to decrease viscosity


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6@;@ B*+F"$ M @(-1'%2 ;'F"7"82 J.H:B ;+)3*#2.)8

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6@;@ B*+F"$ M @(-1'%2 ;'F"7"82 J.H:B ;+)3*#2.)8

56786%)196$(:&6

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4"8"+'% ;+)#"(( M0J@


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N"+$ (7'%% D*DD%"(I+)7 7"#1'8.#'%%$I)'7"3 D.2*7"8


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Viscosity vs. Temperature PG64-22 (Approximate)


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01'2 'D)*2 7.H

-"+I)+7'8#"9

>18? )$ )@"& AB6&)"$%C


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NCAT Pavement Test Track


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@+AB@>)>1 @C


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3-C EF- 3-C GF- GF- D=1: -HH GF-

Data courtesy of NCAT


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,+*#E K%""2 A-"+'2.)8(



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@#2*'% B2+'.8 !"(-)8("

50% RAP Mixes

Virgin Mixes

RAP stiffer than virgin lessstrain at the same temperature.



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Photo courtesy of N CAT

?"'7 K'2.L*" @--'+'2*(

Cyclically applies aset amount ofstrain to thespecimen.

It bends the testspecimen (beam)until it fails.


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@#2*'% B2+'.8 !"(-)8("

50% RAP Mixes

Virgin Mixes



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K'2.L*" ;"+I)+7'8#" 5H-"#2'2.)8( TPP

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K'2.L*" ;"+I)+7'8#" 5H-"#2'2.)8( @#2*'%

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10 million ESAL strain cycles


Virgin @ 350!/ RAP @ 250!


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K'2.L*" ;"+I)+7'8#" 5H-"#2'2.)8( @#2*'%

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Virgin @ 350!/ RAP @ 250!

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K'2.L*" ;"+I)+7'8#" 5H-"#2'2.)8( @#2*'%

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Virgin @ 350!/ RAP @ 250!

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K'2.L*" ;"+I)+7'8#" 5H-"#2'2.)8( @#2*'%

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Virgin @ 350!/ RAP @ 250!

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A21"+ K)'7"3 0J@ ?"8"U2(

Use less fuel due to lower temperature

(approx. 50F [28C] reduction)

Less CO2emissions and VOC emissions

Better working conditions / Better neighbor

Less oxidation of mix

Can be used as a compaction aid

Extended hauling distances


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0J@ ?"8"U2V !"3*#"3 57.((.)8(

Mix Temperature

(C)

Load-out Emissions(kg/yr)

Silo-filling Emissions

(kg/yr)

% Reduction

163 1064 3317

135 303 945 71.5

127 208 649 80.4

Volatile Organic Compounds (VOC)*

! Based upon a plant producing mix at 360TPH with a totalyearly production of 544,310 tonnes (600,000 tons) using

USEPA emissions factors for HMA production.


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0J@ ?"8"U2V !"3*#"3 57.((.)8(

Mix Temperature

(F)

Load-out Emissions(lb/yr)

Silo-filling Emissions

(lb/yr)

% Reduction

325 2346 7312

275 669 2084 71.5

260 459 1430 80.4

Volatile Organic Compounds (VOC)*

! Based upon a plant producing mix at 400TPH with a totalyearly production of 600,000 tons using USEPA emissions

factors for HMA production


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W)*D%" ?'++"%X C)7D.8'2.)8 W+$"+ J.H"+


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B"Y*"82.'% J.H.8L

Virgin aggregate mixing begins on collecting conveyor

Virgin aggregate mixing continues at the scalping(oversize) screen

Vigorous mixing in the dryer

Gentle mixing in the mixing chamber


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N.+L.8 'LL+"L'2" 7.H.8L D"L.8( )8#)%%"#2.8L #)8F"$)+


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Coarse material first

5'#1 D.8 3"-)(.2( 7'2"+.'% )8 #)8F"$)+

Belt Travel


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Fine material last

5'#1 D.8 3"-)(.2( 7'2"+.'% )8 #)8F"$)+

Belt Travel


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Material NOTmixed, but

Aggregate types are in proper proportion, and

In close proximity to one another

5'#1 D.8 3"-)(.2( 7'2"+.'% )8 #)8F"$)+


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C)%3 K""3 ?.8(

Aggregate types are in properproportion, and in close

proximity to one another


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After the sifting action of the scalping screenUnmixed material cannot bevisually detected. All this is PRIOR to mixing in the dryer

N.+L.8 'LL+"L'2" 7.H.8L #)82.8*"( '221" (#'%-.8L Z)F"+(.["\ (#+""8


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N.L)+)*( 7.H.8L .8 21" 3+$"+]


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,1)+)*L1 7.H.8L .8 21" 7.H.8L#1'7D"+]


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,1)+)*L1 7.H.8L .8 21" 7.H.8L#1'7D"+]


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W)*D%" ?'++"%@3F'82'L"(

Low radiation loss -- shell radiates into mix. Counter flow minimum stack temperature.

Easier on bags (temp. and hydrocarbons).

Clear stack with high % RAP, low CO

Sequential, thorough mixing Steam release blankets RAP and superheated

aggregate mechanism of heat transfer.


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W)*D%" ?'++"%K'#2(

850 units worldwide 180 tonne/hr to 540 tonne/hr

360 tonne/hr is the most common sizeworldwide

Located on every populated continent

Guaranteed 50% RAP capability

Used to produce specification mixes fromwalking paths to airport runways


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C)8#%*(.)8(V

RAP is a RESOURCE Milling enhances infrastructure function and

maintainability

RAP and bitumen foaming are not new technologies RAP + WMA " longer life pavements (NCAT data)


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C)8#%*(.)8(V

Double Barrel offers sequential thorough mixing Direct RAP driers have the potential to oxidize,

volatize, and produce carbon monoxide

Blending of RAP and virgin aggregate in the DoubleBarrel mixing chamber

Clear exhaust stack

Protective steam blanket

Production of specification mix worldwide


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