Asphalt Rubber Surface Treatment & SAMIs in Pavement Preservation

June 5, 2007

By Rod Birdsall, P.E.

62nd School for Highway Superintendents

Cornell Local Roads Program

ResourcesResourceswww.fp2.orgwww.fp2.org

www.pavementpreservation.orgwww.pavementpreservation.orgwww.allstatesasphalt.comwww.allstatesasphalt.comwww.rubberpavements.orgwww.rubberpavements.org

www.dot.ca.govwww.dot.ca.gov type in crumb rubbertype in crumb rubber

WHY Pavement Preservation?WHY Pavement Preservation?

1. 1. KeepKeep ‘‘GOODGOOD’’ pavements inpavements in ““GoodGood””Condition.Condition.2. 2. Corrects surface deficiencies.Corrects surface deficiencies.3. 3. Preserves the pavement system.Preserves the pavement system.4. 4. Retards future deterioration.Retards future deterioration.5. 5. Maintains or improves the functional Maintains or improves the functional condition of the pavement system.condition of the pavement system.

PHILOSOPHY OF ASPHALT RUBBER PHILOSOPHY OF ASPHALT RUBBER PREVENTIVE MAINTENANCEPREVENTIVE MAINTENANCE

RIGHT TREATMENT RIGHT PAVEMENT

RIGHT TIME

RIGHT TREATMENT RIGHT TREATMENT RIGHT PAVEMENTRIGHT PAVEMENT

RIGHT TIMERIGHT TIMEBE PROACTIVE ‘NOT’ REACTIVE!

Life of a PavementLife of a Pavement

0Years

PCI

(Pav

emen

t Con

ditio

n In

dex)

100

$1 of preventive maintenance here..

Eliminates or delays spending $8 - $10 on rehabilitation here.

Total Reconstruction $40 +

40% Drop in Quality

75% of Life

40% Drop in Quality

12% of Life

TRAFFICTRAFFIC4 Million Miles of Road4 Million Miles of Road2.4 Million is Paved2.4 Million is Paved

•• 1980 1980 –– 1999 1999 1.5% Newly Constructed Road1.5% Newly Constructed Road76% More Vehicles76% More Vehicles

WORK ZONES ~ WORK ZONES ~ 482,000,000 hours of delay each year482,000,000 hours of delay each year

Asphalt Rubber Surface Asphalt Rubber Surface Treatment or SAMI Treatment or SAMI Application (ARST)Application (ARST)

The ARST is a blend of 20% crumb rubber (20 mesh) and asphalt (58-28 or 64-22). CRM is hot spray-applied (approx. 375-400 degrees) at the rate of 0.60 gallons per square yard. Then covered with heated and pre-coated 3/8" or 1/2" stone, followed by rolling and sweeping.

Adding Crumb RubberAdding Crumb Rubber……....

Why Asphalt Rubber / SAMI?Why Asphalt Rubber / SAMI?1. High residual application of asphalt for long 1. High residual application of asphalt for long

term performance.term performance.2. Impermeable!2. Impermeable!3. Flexible ~ good for moderately cracked 3. Flexible ~ good for moderately cracked

pavements.pavements.4. Relative easy/fast to apply.4. Relative easy/fast to apply.5. Reliable performance.5. Reliable performance.6. Ideal for Cold/Wet Climates.6. Ideal for Cold/Wet Climates.7. Can be used as Macro Surface or SAMI layer.7. Can be used as Macro Surface or SAMI layer.8. Quick HMA Overlay8. Quick HMA Overlay9. Environmentally Sound.9. Environmentally Sound.

Advantages of an Asphalt Rubber Advantages of an Asphalt Rubber Surface Treatment / SAMI!Surface Treatment / SAMI!

Natural antiNatural anti--oxidants of rubberoxidants of rubberIncreased expansion & contraction of asphalt even at low Increased expansion & contraction of asphalt even at low temperatures to resist thermal & fatigue crackingtemperatures to resist thermal & fatigue crackingHigher softening point of asphalt (no bleeding)(150 Higher softening point of asphalt (no bleeding)(150 –– 165)165)Greater amount of asphalt appliedGreater amount of asphalt appliedNo loose aggregateNo loose aggregateMinimizes Reflective CrackingMinimizes Reflective CrackingLonger Life Cycle ~ reduced aging/oxidationLonger Life Cycle ~ reduced aging/oxidationReduced life cycle costsReduced life cycle costsCan be RecycledCan be Recycled

……limit costly rehabilitation or limit costly rehabilitation or structural overlays.structural overlays.

Asphalt Rubber can extend the life of structurally sound pavemenAsphalt Rubber can extend the life of structurally sound pavementsts……

…… prevent future deteriorationprevent future deterioration……

Environmentally SoundEnvironmentally SoundCRMA vs. Tire DisposalCRMA vs. Tire Disposal

Environmentally SoundEnvironmentally SoundPassenger Tire usage in CRMAPassenger Tire usage in CRMA

Approx. 10lbs of Recyclable Rubber in 1 passenger size Approx. 10lbs of Recyclable Rubber in 1 passenger size tire.tire.1 gallon of 20% CR is made up of; by weight is 8 lbs.1 gallon of 20% CR is made up of; by weight is 8 lbs.8 lbs X .20 = 1.6 lbs of CR per gallon8 lbs X .20 = 1.6 lbs of CR per gallonApplication rate of .60 gals / sy = .960 lbs of CR / SYApplication rate of .60 gals / sy = .960 lbs of CR / SY1 mile of pavement by 241 mile of pavement by 24’’ wide = 14,080 SYwide = 14,080 SY14,080 SY X 0.960 lbs of CR / SY = 13,517 lbs of CR14,080 SY X 0.960 lbs of CR / SY = 13,517 lbs of CR13,517 lbs per mile / 10 lbs per passenger tire = 13,517 lbs per mile / 10 lbs per passenger tire = 1,3521,352passengers tires recycled per mile.passengers tires recycled per mile.

WHY Pavement Preservation?WHY Pavement Preservation?

6. 6. Saves BudgetsSaves Budgets $$$$$$..

PPM is a LowPPM is a Low--Cost Solution with Cost Solution with Dedicated FundingDedicated Funding

PPM projects have demonstrated that for every dollar PPM projects have demonstrated that for every dollar spent now, $6 spent now, $6 -- $11.5 will be saved in the future.$11.5 will be saved in the future.

Michigan Michigan Implementation of PPM has led to, up to 11.5:1 Implementation of PPM has led to, up to 11.5:1 savings over road reconstruction.savings over road reconstruction.$700+ Million had been saved since 1992$700+ Million had been saved since 1992

California California Implementation of PPM has led to a 6:1 savings over Implementation of PPM has led to a 6:1 savings over road reconstruction. road reconstruction. Currently spends $70Currently spends $70--$80 million per year on PPM$80 million per year on PPM

ASPHALT RUBBER VS. HOT MIXASPHALT RUBBER VS. HOT MIX

2 MILES ROAD X 222 MILES ROAD X 22’’ = 25,813 SY= 25,813 SY

ARST @ $ 3.50 / SY = $ 90,345.50ARST @ $ 3.50 / SY = $ 90,345.501 1 ½”½” Overlay @ $ 62.00 / Ton = $134,850.00Overlay @ $ 62.00 / Ton = $134,850.00

Cost Savings ~~~ 20% ~ $ 44,504.50Cost Savings ~~~ 20% ~ $ 44,504.50

COSTS NOT SEEN BEHIND THE COSTS NOT SEEN BEHIND THE SCENE!!!SCENE!!!

NO NEED FOR SHOULDER WORKNO NEED FOR SHOULDER WORKNO REAL LOSS TO CURB REVEALNO REAL LOSS TO CURB REVEALNO DRIVEWAY APRONS NEEDEDNO DRIVEWAY APRONS NEEDEDSKID RESISTANCESKID RESISTANCESALT AND WINTER CALCIUM/MAG RESIDUALSALT AND WINTER CALCIUM/MAG RESIDUALHELPS RETARD REFLECTIVE CRACKINGHELPS RETARD REFLECTIVE CRACKINGIMPERMIABLE PRODUCT!!! WATER IMPERMIABLE PRODUCT!!! WATER BARRIERBARRIER……....

CRSCRS--22 CRMACRMA1. Asphalt Applied1. Asphalt Applied .25 gal / sy.25 gal / sy .60 gal / sy.60 gal / sy

(residual)(residual) ACAC--2020 ACAC--2020

2. Stone Applied2. Stone Applied 2020--25 lbs / sy 25 lbs / sy 35 lbs / sy 35 lbs / sy virgin or treatedvirgin or treated heated & heated & with with pugmillpugmill treated at hot treated at hot

mix plantmix plant

3. Avg. Life Cycle3. Avg. Life Cycle 3 3 –– 7 years7 years 10 10 –– 12 years12 years

4. ADT4. ADT 2,000 vehicles2,000 vehicles 30,000 vehicles30,000 vehicles

5. Post Sweeping 5. Post Sweeping 1 week1 week Same DaySame Day

6. Rubber Content6. Rubber Content 20% Crumb 20% Crumb RubberRubber

Asphalt Rubber Surface TreatmentAsphalt Rubber Surface Treatment

vs.vs. CRSCRS--2 Emulsion Chip Seals2 Emulsion Chip Seals

Highways ~ High ADT 25,000

Streets ~ Low ADT 8,000

Approx. 17,500 ADT

Approx. 4,000 ADT

Economics for Low and High Volumes Roads

No Loose Stone!!!

Longitudinal Joint Overlap

Finished Surface

ASPHALT RUBBER SURFACE ASPHALT RUBBER SURFACE TREATMENTTREATMENT

Will seal any minor cracking!

100% Residual compared to other procedures using Emulsion.

Asphalt Rubber on Concrete Asphalt Rubber on Concrete PavementPavement

Before

After

Delamination not an issue over PCC.

MOUNT HOPE BRIDGE, RIMOUNT HOPE BRIDGE, RI43#’s compared to 110#s for HMA

CRM/S Components!CRM/S Components!

1. Crumb Rubber Modified Asphalt.1. Crumb Rubber Modified Asphalt.–– Special design blending equipmentSpecial design blending equipment

2. Sized, Heated, Pre2. Sized, Heated, Pre--Coated Aggregate.Coated Aggregate.3. Modified Distributor with mixing 3. Modified Distributor with mixing capabilities.capabilities.4. Adjustable width Chip Spreader.4. Adjustable width Chip Spreader.5. Rollers.5. Rollers.6. Brooms.6. Brooms.

Full Production

Post-Sweep

HIGH VOLUME ROADS ~ 35 –75 MINUTES, TRAFFIC IS BACK ON!

ONLY UP TO 10% WASTE FOR STONE ~ NO LOOSE STONE ONCE SWEPT!

Suffield, CT 20% RACS

August 1996 (Before)

August 1996 (After)

Picture taken September 26, 2006 of same road, 11 years later.

State of DelawareSeptember 2006

Delaware ~ Horse n’ Buggy Traffic

Tompkins County Route 13Tompkins County Route 13

Finished Surface TextureFinished Surface Texture

Herkimer County Route 28Herkimer County Route 28

Chenango County Route 8Chenango County Route 8

Jefferson County Route 11Jefferson County Route 11

Properties of CRMA ~ SAMI LayersProperties of CRMA ~ SAMI Layers

High Asphalt Content >12% ~ ASTM 6114High Asphalt Content >12% ~ ASTM 6114Enhance Structural Strength ~ Equivalent to Enhance Structural Strength ~ Equivalent to 11”” HMAHMAImpermeableImpermeableResistance to Fatigue, Reflective and Resistance to Fatigue, Reflective and Thermal CrackingThermal CrackingCan Cover Immediately with HMA or Open Can Cover Immediately with HMA or Open to Traffic and Pave Laterto Traffic and Pave Later

SAMI in a three layer systemSAMI in a three layer system

PrePre--existingexisting

PavementPavement

HMA OverlayHMA Overlay

SAMISAMI

Leveling CourseLeveling Course

Crumb Rubber SAMICrumb Rubber SAMI

after 8 years serviceafter 8 years service

Crack disappearing in 10 year old Seal Coat

WITHOUT RUBBER SAMI WITH RUBBER SAMI

Crumb Rubber Crumb Rubber SAMIsSAMIs (Stress (Stress Absorbing Membrane Interlayer)Absorbing Membrane Interlayer)

Crumb Rubber SAMIsCrumb Rubber SAMIs

Crumb Rubber SAMI Crumb Rubber SAMI with applied HMAwith applied HMA

Rubber SAMI ~ Stress Absorbing Rubber SAMI ~ Stress Absorbing Membrane InterlayerMembrane Interlayer

SAMI done in July SAMI done in July 2000 in Chicopee, 2000 in Chicopee, MA. Picture taken MA. Picture taken 2/16/062/16/06

SAMI’s Help Prevent Reflective Cracking

Chicopee, MA October 2006

6 years old

1992 CAL1992 CAL--TRANS Test SiteTRANS Test Site

ALF Project Test SectionsALF Project Test Sections

CRMA70-22

1

70-22

2

AB

3

SBS

4

TBCR

5

Elvo

6

70-22+

Fibers

7

70-22

8

SBS64-40

9

AB

10

SBS

11

Elvo

12

Summary!!! What have we Summary!!! What have we learnedlearned……

Asphalt Rubber being widely used to Asphalt Rubber being widely used to enhance asphalt performance.enhance asphalt performance.SAMI layers ~ stopping the water barrier SAMI layers ~ stopping the water barrier and reducing reflective cracking.and reducing reflective cracking.Longer lasting pavements resulting in Longer lasting pavements resulting in Lifetime Savings $$$!!!Lifetime Savings $$$!!!FP2 & NCPP are there to help!FP2 & NCPP are there to help!

Phone 800.343.9620 Cell 413-687-2208

www.allstatesasphalt.com

PRODUCTS n’ SERVICESASPHALT RUBBER SURFACE TREATMENT

FIBERMAT CHIP SEAL

FABRIC ~ FIBERGLASS/POLYESTER NON-WOVEN (TRUPAVE)

COLD MIX ASPHALT IN PLACE

RECLAMATION / BOMAG

LIQUID CALCIUM CHLORIDE/MAGNESIUM CHLORIDE ~ OTHER LIQUIDS

NOVA CHIP (PAVER PLACED SURFACE TREATMENT)

CONVENTIONAL CHIP SEALS / SAND SEALS

CALCIUM CHLORIDE EQUIPMENT

We thank you for your time!

ANY QUESTIONS!!!!!