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NCAT WMA Research 2007. Andrea Kvasnak. WMA Field Projects. Chattanooga, TN Silverthorne, CO Birmingham, AL Nashville, TN Rock Hill, SC. Chattanooga. Two site visits Both using Astec Green System Visit 1: Parking lots at Astec Plant Visit 2: North Terrace Road . Chattanooga Site 1.

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ncat wma research 2007

NCAT WMA Research 2007

Andrea Kvasnak

1

wma field projects
WMA Field Projects
  • Chattanooga, TN
  • Silverthorne, CO
  • Birmingham, AL
  • Nashville, TN
  • Rock Hill, SC

2

chattanooga
Chattanooga
  • Two site visits
  • Both using Astec Green System
  • Visit 1:
    • Parking lots at Astec Plant
  • Visit 2:
    • North Terrace Road

3

chattanooga site 1
Chattanooga Site 1
  • Foamed Asphalt
    • Moisture added was 0.1% by wt of total mix
  • Compaction Temperatures
    • 245°F for Virgin
    • 265°F for RAP
  • Haul, place and compact using normal procedures

4

placement of foamed asphalt at astec plant
Placement of Foamed Asphalt at Astec Plant
  • 30% RAP base placed first
  • Some issues with poor base support
  • Material was workable
  • Reduced odor

5

placement of virgin mix
Placement of Virgin Mix
  • Outside bay doors
  • Target compaction temperature of 245°F
  • Compaction was same
  • Some issues with handwork

6

placement of 30 rap surface
Placement of 30% RAP Surface
  • Atop 30% base course
  • Compacted at lower temperature than target
  • No issues with compacting

7

chattanooga site 1 laboratory testing
Chattanooga Site 1: Laboratory Testing
  • Mobile lab compacted specimens at location
  • Moisture Susceptibility
    • 30% RAP base and virgin surface > 0.9 TSR
    • 30% RAP surface ~ 0.58 TSR
  • Asphalt Pavement Analyzer
    • RAP mixes performed better than virgin
  • Hamburg Wheel Tracking Device
    • Stripping inflection points < 10,000
    • RAP mixes passed, virgin did not

8

chattanooga tn site 2
Chattanooga TN Site 2
  • Astec Double Barrel Green
  • 2” overlay
  • 50% RAP
  • Place at 270°F

9

chattanooga site 2 laboratory testing
Chattanooga Site 2:Laboratory Testing
  • Moisture Susceptibility
    • Average TSR of 0.8
  • Asphalt Pavement Analyzer
    • Average rut depths < 4 mm
  • Hamburg Wheel Tracking Device
    • Ruts < 5 mm
    • Stripping inflection < 10,000

10

silverthorne co
Silverthorne, CO
  • Three WMA technologies
    • Advera WMA
    • Sasobit
    • Evotherm DAT
  • Night time paving
  • Mountain terrain with heavy truck traffic

11

birmingham al
Birmingham, AL
  • Evotherm DAT
  • State Rd 79
  • Night time paving
  • WMA and HMA produced and placed
    • WMA: 15% RAP
    • HMA: 10% RAP and 5% shingles
    • Originally considered RAS for both

12

birmingham al cont
Birmingham, AL cont.
  • PG 67-22 binder
  • HMA and WMA placed in the same lane
  • About 2050 tons of each mix
  • 1.5 nights of paving for each mix
    • Test strips (500 tons) and full paving stretch

13

birmingham al laboratory testing
Birmingham, AL:Laboratory Testing
  • Moisture susceptibility
    • 3 out of 4 nights passed (2nd WMA 0.7)
  • APA
    • APA: WMA > 5 mm, HMA > 3 mm
  • IDT creep compliance
    • Not completed
  • Dynamic modulus
    • Not completed

14

shingles
Shingles
  • ALDOT and others interested in trying shingles
  • Concern: Temperature not high enough to get shingle binder activated
  • Looking into doing some at the NCAT test track
    • Specimens will be compacted on site

15

nashville tn
Nashville, TN
  • SR 46 in Nashville
  • 4 WMA Technologies and 2 controls
    • Astec Green System
    • Advera WMA
    • Evotherm DAT
    • Sasobit
  • 3 Plants
    • 2 different aggregate sources
    • Furthest haul 45-60 minutes

16

nashville tn cont
Nashville, TN cont
  • PG 70-22
  • Marshall mix

17

nashville tn field information
Nashville, TN Field Information
  • Astec Green System
    • 775 tons
    • Compaction: 230°F
    • Density: 91.6%
  • Advera WMA
    • 1150 tons
    • Compaction: 235°F
    • Density: 92.7%

18

nashville tn field information cont
Nashville, TNField Information Cont.
  • Evotherm DAT
    • 750 tons
    • Compaction: 230°F-250°F
    • Density: 91%
  • Sasobit
    • 705 tons
    • Compaction: 245°F
    • Density: 91.7%

19

nashville tn laboratory testing
Nashville, TN:Laboratory Testing
  • Moisture Susceptibility
    • All failed except Astec Green (0.83)
  • APA
    • Average rut depths for all less than 8mm
  • Hamburg
    • Not completed
  • IDT Creep Compliance
    • Not completed
  • Dynamic Modulus
    • Not completed

20

rock hill sc
Rock Hill, SC
  • 4 mixes
    • Fractionated RAP
    • 30% RAP Intermediate and Surface
    • 50% RAP Intermediate and Surface
  • PG 64-22
  • Testing has not been initiated

21