Joe Peterson
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Transcript of Joe Peterson
California’s Transition Hveem To Superpave
Trivia
Pilot Projects• 6 Projects Completed• 13 Projects in Construction• 14 Approved Mix Designs• Placed over 100,000 tons of HMA-SP (Type A) and
RHMA-SP-G• Superpave HMA has been placed in high traffic
areas such as LA-405, and low volume country roads, all with great success.
o
Studies• University of California Pavement Research Study• Completed: December 2012• Looked at 15 Existing Hveem JMF’s from around
the State• Study showed all 15 mix designs with some
adjustments in OBC , grading and dust proportion would meet the Superpave specification.
• Report is available at:o http://www.dot.ca.gov/hq/esc/Translab/ormt/superpave/index.htm
Superpave MethodologyAASHTO M 323
Volumetric requirements
AASHTO R 35Mix Design evaluation
AASHTO T 312SGC Mixture Compaction
AASHTO R 30Mixture Conditioning
AASHTO T 324Hamburg Test
SP 2SUPERPAVE Mix Design Handbook
VolumetricsAir Voids, VMA, VFA
AASHTO T 283Moisture Sensitivity
Job MixFormula
JMF DESIG
N
Basis for Design• Gyrations Compaction AASHTO T 312
Type A RHMA-GNinitial 8 Ndesign =50-150Ndesign 85
Nmax 130
• Air Voids AASHTO T 269Type A RHMA-G
Ninitial >8.0% Ndesign=Specifications Ndesign =4.0%Nmax >2.0%
Design VolumetricsAsphalt Institute SP-2
HMA Type A-SP• VMA
o 1/4” grading 18.0 (-1.0, +3.0)o 3/8” grading 16.0 (-1.0, +3.0)o 1/2” grading 14.5 (-1.0, +3.0)o 3/4” grading 13.5 (-1.0, +3.0)
• DPo 1/4” & 3/8” grading 0.6-1.3o 1/2” & 3/4” grading 0.6-1.3o 1” grading 0.6-1.3
DesignVolumetricsAsphalt Institute SP-2
RHMA G-SP• VMA
o 1/2” grading 19.0-24.0o 3/4” grading 19.0-24.0
• DPo All grading’s Report Only
Hamburg Wheel TrackerAASHTO T324
Testing Temperatureso PG 58 45 degrees C o PG 64 50 degrees Co PG 70 + 55 degrees C
Hamburg Wheel TrackerAASHTO T324
HMA Type A-SP
• Maximum 1/2” Ruttingo PG 58 10,000 passeso PG 64 15,000 passeso PG 70 20,000 passeso PG 76 (+) 25,000 passes
• Inflection pointo PG 58 10,000 passeso PG 64 10,000 passeso PG 70 12,500 passeso PG 76 (+) 15,000 passes
Hamburg Wheel TrackerAASHTO T324
RHMAG-SP
• Maximum 1/2” Ruttingo PG 58 15,000 passeso PG 64 20,000 passeso PG 70 25,000 passes
• Inflection pointo PG 58 10,000 passeso PG 64 10,000 passeso PG 70 12,500 passes
Inflection Point Defined
Moisture Sensitivity AASHTO T283
HMA Type A-SP & RHMA-G-SP• Minimum Dry Strength Break
o 100 psi 4” or 6” sample (gyratory)• Minimum Wet Strength Break
o 70 psi 4” or 6” sample (gyratory) • Ratio is no longer measured• Testing done on plant produced material
CRUSHED/FRACTUREDFACES
AASHTO T335* • Percent of crushed particles Type A RHMA
Coarse aggregate (% min.)One fractured face 95 --- Two fractured faces 90
90
Fine aggregate (% min) 70 70
(Passing No. 4 sieveand retained on No. 8 sieve.
*Crushed Face defined as 50% of projected face
RAP Utilization• JMF Design: RAP
o0% to 25% o RAP fractionated into:• + #3/8” Sieve• - #3/8” Sieve
oAllowable stockpile variance, binder content: +/-2.0%
oRice Specific Gravity• Allowable stockpile variance Gmm= +/-0.060
Binder Content/Air Voids
Plant Produced Material• Asphalt Binder Content %
HMA Type A-SP RHMA G-SP
- 0.30, +0.5 - 0.40, +0.5
• Air Voids Content %HMA Type A-SP RHMA G-SP 4 +/- 1.5 Specification +/- 1.5
*Bulk SPG by Weigh wax weigh
PRODUCTION
PARAMETERS
Production QC and QA• Aggregate Quality• Aggregate Grading• Binder Content• HMA Moisture• VMA, DP, & Air voids• Hamburg Wheel Tracker• Moisture Susceptibility
Density QC• Percent of theoretical maximum
density by Nuclear gauge (%) HMA Type A-SP RHMA G-SP 92 – 97 92 – 97
Verify gauge correlation to cores every 10,000 tons utilizing the average of 2 cores
Density QC• Percent of theoretical maximum density
by coreo 2 per paving day
HMA Type A-SP RHMA G-SP 92 – 97 92 – 97
Verify gauge correlation to cores every 10,000 tons utilizing the average of 2 cores
Minor Hot Mix Asphalt• 1000 tons or less total production for:
o Caltrans Projectso Projects within State Right-A-Way
• Requires a JMF submittal• Mandatory use of liquid antistrip• Requires a production start up
evaluation • Requires quality control testing
Minor Hot Mix Asphalt• Verification is done on laboratory
produced material (No hot drop)• Verifications times remain the same• AASHTO T 324 does not apply• AASHTO T 283 does not apply• CT 204 does not apply• FAA and F&E do not apply
Minor Hot Mix Asphalt• Verification consists of testing
for:oAggregate qualityoAggregate gradationoAsphalt binder contentoAir VoidsoVMA
Minor Hot Mix Asphalt• QC testing consists of:
oAggregate gradationoAsphalt binder contentoAir VoidsoVMAoDensity by Nuclear gage (if applicable)
Minor Hot Mix Asphalt• QA consists of testing for:
oAggregate gradationoAsphalt binder contentoAir VoidsoVMA
Quality HMA
Mix Design
sampling
QC
QA
QUESTIONS?
?