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?

?