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Recycled Asphalt Pavement In Preservation Doug Ford Pavement Coatings Co.
All Agencies Need Revenue
Not in My Backyard Lets Talk Recycling
Reclaimed Asphalt Pavement (RAP) Utilizing the Value o Asphalt has always been Recyclable o Valuable material in Hot Mix Asphalt o Used when and where feasible n How do we expand to better utilize this value
RAP Utilization o Products n Chip Seal n Slurry Seal & Micro Surfacing o Processing o Unique Example o Deep Recycling n Cold In-Place Recycling (CIR) n Cold Central Plant Recycling (CCPR)
Products Typical Uses o RAP Base o Shoulder Backing o Trucking yards o Dust Control o Crushed Miscellaneous Base Good products but they don’t use the most valuable asphalt
Products Chip Seals
RAP Chip Gradation TABLE 200 -1. 2. 1 (A) Percent Passing 1 Sieve Size Medium 3/8” Medium Fine 5/16” 1/2" (12. 5 mm) 100 3/8" (9. 5 mm) 85 -100 No. 4 (4. 75 mm) 0 -15 0 -50 No. 8 (2. 36 mm) 0 -5 0 -15 No. 16 (1. 18 mm) - 0 -5 No. 200 (75 um) 0 -2 Residual Asphalt Content 2 3. 5% Min. (Based on dry weight of aggregate) 1. On unextracted RAP. 2. On extracted RAP. Determined by CT 362, CT 379 or CT 382.
RAP Chip Material Residual Asphalt Chips Single stones and conglomerations Residual asphalt content will vary by sample
Laboratory Tests on Chip n Los Angeles Abrasion (ASTM C 131) n. Cleanness Value: 58 (Cal 227) o 5% Loss -100 Revolutions o 23% Loss – 500 Revolutions n. Spec is 75 minimum n. But not an issue
3/8” Chips Appearance is dirty but the dust is actually asphalt dust. Bonding capability is outstanding.
RAP Chip Seal Early Projects El Rivino Rd San Bernardino County 2006 November 2014
RAP Chip Seal Los Angeles County Avenue J 2009 Scrub seal with rejuvenating emulsion Extensive block cracking and alligator cracking
RAP Chip Seal Los Angeles County Hand applied additional chip to low areas Rain fell that night
RAP Chip Seal Los Angeles County Avenue J 7/18/14
Best Practices RAP Chip Seal n What is a clean chip seal o Dust is not dust, it’s asphalt o Gradation problems will affect ability to bond n With emulsions chips should be moist n Rejuvenators are very good but should not be overapplied n Double chips seal o One layer should not be RAP
RAP Slurry Seal and Micro Surfacing
Type II RAP Slurry Aggregate
RAP Slurry Gradation RAP Slurry Dust Sieve Size Percent Passing UNextracted Percent Passing Extracted ISSA Specification 3/8" 100 100 No. 4 95 -100 90 -100 No. 8 65 -85 70 -90 65 -90 No. 16 35 -60 50 -75 45 -70 No. 30 18 -38 35 -55 30 -50 No. 50 8 -25 22 -40 18 -30 No. 100 5 -20 13 -38 10 -21 No. 200 2 -12 10 -20 5 -15 Residual AC 6. 5% Min.
Rap Slurry Gradations
RAP Slurry Material Consistent Residual Asphalt through Segregation Slurry Dust Very few conglomerations Residual asphalt remains consistent
RAP Slurry Seal Laboratory Test Results RAP Slurry Seal Component Amount ISSA Type II Amount Emulsion 10% - 14% 12% - 18% Residual AC 12. 5% Min. 7. 5% - 13. 5% Minimum 12. 5% Residual @ 10% Emulsion Minimum 7. 5% Residual @ 12% Emulsion
Field Test Applications Calibration: as with any slurry or micro, calibration is essential! o RAP is lighter than virgin aggregate. o Because RAP emulsion percentage is low, gate may need to be modified. o Insure material will run through gate without clumping.
Field Test Applications o July 2003, Descanso Gardens, La Canada, CA. o 13. 5% CQS-1 h 2005 Subject to excessive water
Field Test Applications o August 2003, Rodeo Access Rd, Devore, CA o Varied percentages and additives
RAP Slurry Through 2014 o o o o o City of Agoura Hills City of Barstow City of Delano Caltrans District 8 Maintenance Caltrans District 11 Maintenance City of Costa Mesa City of Corona City of Garden Grove City of Hesperia City of Irvine City of Oxnard City of Palmdale City of Port Hueneme City of Santa Clarita City of Sierra Madre City of Westlake Village County of Los Angeles County of San Bernardino – Special Districts County of Ventura
RAP Slurry & Micro Surfacing Southern California Testing Started in 2003 Why RAP o 100% Recycled o Better Color Retention o Cost Effective o Zero Loss in Performance Six Months after Rain & Snow
Conventional Equipment Super Results From 2003 to 2014
Best Practices o Slurry Seal n n RAP Fines must be fresh. Material that has been stored or stockpiled too long should be rescreened Stock Pile Management o Do not stock pile too much o n n material Use material as it is delivered (load out from all sides) Do not load trucks the night before Minimum requirement of 3% latex polymer Rubber tire roller, minimum three passes High traffic areas can not be over asphalted
Finished Environmentally Friendly Product
How to Utilize RAP o Screening Process o Utilization of In House RAP Existing RAP Stock Pile or New RAP Stock Pile Being Developed
RAP Aggregate Products Prodced § § § Rap Chips (5/16” and 3/8”) Rap Type II Slurry Dust Crushed Miscellaneous Base AC Base RAP Base Mixing Aggregates for CCPR
5/16” Chips Made from RAP All chips must be screened twice!
RAP Slurry/Micro Dust Screening process for slurry and chips requires segregation. o 50%-60% Slurry o 40%-50% Chips Balancing the end product can be challenging
Best Practices o Clean RAP for Slurry n Contaminated material should be segregated for use on other products n Sand Equivalent (SE) o Utilization of multiple products at one time n Chips and slurry dust – Slurry and AC Base o Minimum of two screenings for chips. o Moisture content n Wet for chips on Emulsion Binders n Dry for chips on Hot Asphalt Binders o RAP Slurry Seal can not sit more than two to four weeks without being re-screened.
Caltrans On-Site Management
Caltrans District 8 Maintenance o In house crews n n n o Chip Seal Crack Seal Shoulder Backing Contract Work n Slurry Seal Utilized four RAP piles separated by over 150 miles from each other. This process allowed Caltrans to make multiple products from their own material. The trucking cost can exceed $38 per ton to some locations. Superior products used for two years with little to no additional cost.
RAP Chip and RAP Slurry (RAP Cape) Aggregates Produced Simultaneously
Caltrans District 8 Maintenance Application of RAP Chip Seal using stockpiled material owned by the state
Cold In-place Recycling (CIR) Distressed Pavement = New Pavement Using A Train of Equipment that: n Mills old pavement into Reclaimed Asphalt Pavement (RAP) n n n Crushes RAP to gradation Mixes with recycling agent Re-Paves recycled mix Compacts to specified density Readies for surface treatment Small carbon footprint
Cold In-Place Recycling (CIR) Location
The Train Emulsion Recycler Mill Water Truck
Paving and Compaction
Roller Sequence and Compaction
Cold Central Plant Recycling (CCPR) From RAP Clean Rap = New Pavement: n n n Stockpiled and kept clean Crushed RAP to gradation Mixed with engineered emulsion n n In a central plant Transported to lay down area Paved as a recycled mix Compacted to specified density Readied for surface treatment to Pavement
“Urban Quarries” Recycle Sustainable Assets on Site!
Loading Reclaimed Asphalt Pavement (RAP)
New Recycled Asphalt
Truck bring in Old Millings and Haul Back New Recycled Asphalt
Installation with a Track Paving Machine
Closing Statement One of the key elements of the County's sustainable program is maximizing the opportunity to reutilize Reclaimed Asphalt Pavement (RAP) in our pavement preservation Treatments. For the last three years we have committed to using RAP in all our pavement preservation treatments. Aside from the environmental benefits gained by using the RAP material in these treatments we are very pleased with their performance as well. Greg Kelley, Deputy Director of Transportation, County of Los Angeles
Questions Thank You Doug Ford