pascal mascarenhas
DESCRIPTION
Presentation by Pascal Mascarenhas of Vulcan Materials on Reclaimed Asphalt Pavement delivered at the CalAPA Fall Conference held Oct. 24, 2013 in Sacramento, Calif.TRANSCRIPT
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HIGH RAP % IN HMACALAPA FALL CONFERENCE
SACRAMENTO
OCTOBER 24, 2013
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CITY OF LOS ANGELES
6500 Miles of improved roads 5800 Miles – Asphalt Concrete Annual Resurfacing budget of
$45 million.
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CURRENT % RAP ALLOWED
Caltrans – HMA – up to 15%– Superpave – 25% +/-1
Green Book – Section 203-6 – up to 20% Allows >20% with additional testing and data
City of LA Contract – 50% RAP
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WHY RECYCLE?
Landfill shortage. August 11,1987 City order
prohibiting the landfilling of road materials.
Beneficial Use Excellent performance
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CYCLEAN
The process used microwave technology to produce HMA at up to 135 tons/Hr
Plant would consume over 200,000 tons of City RAP in 1992 saving the city $1.5 M in raw material and disposal cost.
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CITY OF LOS ANGELES
Uses own equipment and personnel to mill pavements for profiling and grind-out procedures
Millings transported to two locations for stockpiling
Contract requires the use of COLA millings.
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MIX DESIGN PROCESS
Extensive profiling of RAP. Several samples have to be
tested. Extraction and recovery of
individual samples. PG grading of RAP - +PG 82 Blend to PG 64 -10
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Vulcan Los Angeles Regional Lab
Viscosity Testing
Extraction/Recovery
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Recycling Agents (ASTM D4552)
RA1 RA5 RA25 RA75 RA250 RA500
Viscosity @ 60C (cSt) 50-175 176-900 901-
45004501-12500
12501-37500
37501-60,000
Flash Point, C, Minimum
218 218 218 218 218 218
Saturates, %, Minimum
30 30 30 30 30 30
Viscosity Ratio (RTFO or TFO
3 3 3 3 3 3
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Mix Design Procedures
Asphalt Content, Aggregate Gradation and PG or RAP
Gradation of New Aggregate Combined Gradation of Recycled
Mix 75 Blow Marshall Mix Design per
COLA Brown Book
Binder Replacement
Binder Replacement +( (A x B)/C ) x 100
A = RAP percent binder content B = RAP percent in mixture C = Total percent binder content in
mixture.
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COLA Example
A = RAP AC% = 5.4 B = RAP % in mixture = 50 C = Total percent binder in
mixture = 5.2
Binder Replacement = 51.9%
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Testing
Extensive QC Testing– Gradation and AC% on RAP– Gradation on aggregates– PG 64 -10 and Recycling Agent– 75 Blow Marshalls
Extensive QA testing– 4 to 8 samples– 75 Blow Marshalls– Superpave for ARRA jobs
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RAP Processing
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Stockpiling
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Finished Product
½-inch minus RAP
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THANK YOU.
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Questions?
Pascal MascarenhasVulcan Materials
[email protected] Phone
626-969-2918 Fax626-705-6611 Cell