79th iapa annual meeting2016 cont’d districts 1 & 9 received new i-fit’s district 1 will...
TRANSCRIPT
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79th IAPA Annual Meeting
Tom Zehr
HMA Implementation Engineer
Illinois Dept. of Transportation
Jim Trepanier
HMA Operations Engineer
Illinois Dept. of Transportation
Abdul Dahhan
Vice President of Engineering
Chicago Testing Laboratory
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Background on I-FIT
Development of FI Threshold
Implementation
IDOT Experience with I-FIT
CTL Experience with I-FIT
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Long.
Join
t S
eal
Imple
men
t I-
FIT
Tac
k C
oat
Ham
burg
Whee
l
QC
P
PF
P
FR
AP
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One for Stability One for Flexibility
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Hamburg Wheel
for Stability I-FIT for Flexibility
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A Performance Test Like Hamburg Wheel
Developed thru ICT Research R27-128 (Testing Protocols to Ensure Performance of High Asphalt Binder Replacement Mixes Using RAP & RAS)
Uses Semi-Circular Bend (SCB) Configuration w/ Gyratory or Core Specimens @ Room Temp
Test Can Be Completed in a Day
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As Part of the ICT R27-128 Research
Cores from Good & Bad Performing Pavements submitted from each District for FI testing
Dividing Line was FI ≈ 4
So does that mean we should we set our Min. FI at 4?
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0
2
4
6
8
10
12
14
STA LTA ELTA
FI vs Time
FI
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0
2
4
6
8
10
12
14
STA LTA ELTA
FI
FI
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U of I obtained plant mixes used in FHWA Research @ Turner Fairbanks
Mixes were designed to have wide range of flexibility
Mixes were tested to fatigue failure w/ the ALF
Fatigue Failure = Rapid Onset of Cracking
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0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
0 2 4 6 8 10 12
FH
WA
AL
F F
ati
gu
e C
ycl
es
Flexibility Index (FI)
FI -vs- FHWA Accelerated Loading Facility Fatigue
Cycles
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0
2
4
6
8
10
12
14
0 2 4 6 8 10 12 14 16
FI
YEARS
FI -vs- Years
Severe Production Induced Damage
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Cold/Wet Stockpiles
Cold/Wet RAP & RAS Stockpiles
High Production Temps
Extended Silo Storage Time
Long Haul Time
Lower AC Content from Design
Increased Dust Content
Time/Temp of Asphalt Binder Storage
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2016 Pilot Projects (11 Statewide)
Targeted January → April 2016 lettings for Experimental Feature Projects:
▪ I-FIT Design Verification & Production Testing Requirements (Mixes must have FI ≥ 8)
▪ Contractor DCT Design Verification & Production Testing (for Informational Purposes)
▪ Excludes: Pavement Patching & Incidental HMA
▪ RAP/RAS spec revised (for Pilot Projects Only) to allow 5% increase in ABR (except D1 Poly mixes)
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2016 Cont’d Districts 1 & 9 received new I-FIT’s ▪ District 1 will cover Pilot Testing for Dists 1-3 ▪ BMPR will cover Dists 4-6 ▪ District 9 will cover Dists 7-9
2017 Implementation Purchase I-FIT Devices & Tile Saws w/Jigs for
Remaining Districts More Pilot Projects
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Evaluate Use of I-FIT to Screen/Allow Asphalt Modifiers through Long Term Aging Protocol
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0
4
8
12
16
STA LTA ELTA
Fle
xib
ility
In
de
x
0 3% CC 6% CC 9% CC
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Mix Design Verification for I-FIT
1 Sample STA to verify FI ≥ 8.0
1 Sample LTA to verify FI ≥ X.x
Production
1 Sample As-Produced to verify FI ≥ 8.0
1 Sample LTA to verify FI ≥ X.x
LTA Protocol to be Developed thru ICT Research
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1. PFP Dispute Samples
2. I-FIT Pilot Project Testing
3. I-FIT Mix Characterization Testing
4. Other BMPR Projects
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Thank You!
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I-FIT at BMPR
79th IAPA Annual Meeting
Tom Zehr – IDOT BMPR 03-14-16
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I-FIT Specimen
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– Background
– Initial Testing
– Specimen Prep
– Voids
– Aging
– Mixes Tested
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Background
– Test Loading Rate is Fast – 50 mm per min
– Test Temp = 77°F
– DRAFT AASHTO spec on May 17, 2015
• Balloted & Now Being Published
– Also Developed IL Test Procedure 405
• Attached to Spec for Pilot Projects
– Received Initial Machine in July 8, 2015
– “Re-designed” Machine delivered July 23,
2015
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Initial Testing
– All Mixes Plant Mix (Aged on shelf for
varying times (bags of specimens)
– 1st Testing to Evaluate & Learn About
Machine
– Round Robin Study
– Compared Springs –vs- Pivoting Bearing
Base
• 4.75 Level Binder Mix (6 gyros each)
• 2) 9.5 Surface Mixes (3 gyros each)
• 24 Gyro Bricks & 96 Test Specimens
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Roller & Spring
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Bearings & Pivot
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0
5
10
15
20
25
Springs Bearings &Pivot
Springs Bearings &Pivot
Springs Bearings &Pivot
4.75 LB 29% ABR 9.5 Surf 29% ABR 9.5 Surf 48% ABR
14.4
16.26
3.88 4.6
11.64 11.25
7.55 8.32
13.88
10.57
17.36
20.8
Avg
Fle
xib
ility
Ind
ex &
CO
V
Springs -vs- Bearings with Pivot
AVG COV
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Round Robin
– U of I ATREL, CTL, & BMPR
– Each Lab, 2 mixes
• 4.75 Level Binder
• 9.5 Surface
– BMPR Prepared ALL Specimens
– (2 gyros – 8 specimens) per mix
– Also Looking at Effect of Specimens Aging on
Shelf (Extra Specimens)
• 5 month (done)
• Then 8 mo, 1 yr, & 1 ½ or 2 yrs
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8.8
6.8
10.6
8.7
7.1
0
2
4
6
8
10
12
ATREL CTL BMPR Avg of 3 5mo Aging
Ave
rage
Fle
xib
ility
Ind
ex
I-FIT Round Robin - 4.75 Level Binder (35% ABR)
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0
0.5
1
1.5
2
2.5
3
3.5
ATREL CTL BMPR Avg of 3 5mo Aging
Ave
rage
Fle
xib
ility
Ind
ex
I-FIT Round Robin - 9.5 Surface (29% ABR)
2.7
2.5 2.5 2.6
2.9
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Future Round Robin
• When Funding is Available, BMPR Intends
to Purchase a Machine for Each District and
Provide Training.
• BMPR is working on an Instruction Video
on I-FIT Operation
• After Each District has Equipment, a Round
Robin Study Will Be Conducted with
Districts & Private Labs to Evaluate
Variability
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Specimen Prep
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Specimen Prep
– Typical Gyro Brick Height is 160 mm
– However, 160 mm may not work for certain
compactors, so at least 115 mm & cut 1 disk
– Saw Cuts need to be Accurate to ensure Flat
Surfaces, Perpendicular, & Correct
Dimensions
• Disk Thickness – 50 ± 1 mm
• Notch Length – 15 ± 1 mm
• Notch Width – 1.5 ± 0.1 mm
– Consistent Specimen Prep is Important!
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Voids –vs- FI
– Current Spec for Air Voids is 7.0 ± 0.5%
– Common Sense says Voids should have large affect on FI,
– Our Testing so far does not indicate that FI is highly dependent on voids at 7.0 ± 0.5%
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R² = 0.201
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
5.5
6.0
6.5
7.0
7.5
8.0
8.5
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79
FI
Air
Vo
ids
(%)
Voids -vs- FI for 81Bit157M
Voids FI Linear (Voids) Linear (FI)
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R² = 0.458
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
4.0
5.0
6.0
7.0
8.0
9.0
10.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Flex
ibili
ty In
dex
Air
Vo
ids
(%)
Voids -vs- TI for 83Bit116Z
Voids FI Linear (Voids) Linear (FI)
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Voids –vs- FI
– So, for 2016 Pilot Projects, the Air Void Goal is 7.0 ± 0.5% but 7.0 ± 1.0% will be considered
– Future Consideration: Contractor submit several Compacted Gyro Bricks at Same Air Void Level with Half Tested for I-FIT and Half Tested for Hamburg.
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More Air Void Observations
• Voids Typically 0.2 - 0.3 Higher on the Top
Disk than on Bottom Disk
• Voids Often Considerably Greater in 2 Halves
of the SAME Disk than Top & Bottom
• Voids Req’t Is for Disk rather than for Each
Individual Specimen
• 7.0 ± 0.5% Voids often easier for Level
Binder than Surface or Binder
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Ambient Aging
– Jim talked about Need for Oven Aging to Predict
Long-Term Mix Flexibility Properties
– Also Need to Determine Effect on FI of Bags of
Mix and Gyro-compacted or Prepared I-FIT
specimens Sitting on the Shelf
– Plan to sample Mix
• Compact Bricks & Saw Specimens, Keep on Shelf, and
Test at Intervals for Up to 2 years
• Keep Bags of Mix on Shelf Then Prepare and Test
Specimens at Intervals for Up to 2 years
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Mixes Tested
– Have tested 55 mix designs
– 178 gyro bricks
– Currently have a backlog of ≈ 20 mixes
– Report 3 most similar FI values from each
Gyro Brick (after ‘Outlier’ Removed)
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0
2
4
6
8
10
12
N50 N70 N90
Ave
rage
Fle
xib
ility
Ind
ex
Ndesign
Ndesign -vs Avg FI
68
61
37
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0
2
4
6
8
10
12
14
4.75 9.5 19.0
Ave
rage
Fle
xib
ility
Ind
ex
NMAS
NMAS -vs- Avg FI
26
118 30
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0
2
4
6
8
10
12
0 ≤10 >10 to ≤20 >20 to ≤30 >30 to ≤40 >40
Ave
rage
Fle
xib
ility
Ind
ex
Percent ABR
Percent ABR -vs- Avg FI
6 26
43
62 30
8
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0
2
4
6
8
10
12
14
0 ≤10 >10 to ≤20 >20 to ≤30 >30 to ≤40 >40
Ave
rage
Fle
xib
ility
Ind
ex
Percent RAP
Percent RAP -vs- Avg FI
8
44
56
31
4
35
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0
1
2
3
4
5
6
7
8
9
10
0 ≥2 to <3 ≥3 to <4 ≥4
Ave
rage
Fle
xib
ility
Ind
ex
Percent RAS
% RAS -vs- Avg FI
102
8 13
55
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0
2
4
6
8
10
12
14
52-34 58-28 64-22 64-28 70-22 70-28 76-22 76-28
Ave
rage
Fle
xib
ility
Ind
ex
PG Grade
PG Grade -vs- Avg FI
6
51
26
2
5
32
4
5
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0
2
4
6
8
10
12
14
<5.0 ≥5.0 to <5.5 ≥5.5 to <6.0 ≥6.0 to <7.0 ≥7.0
Ave
rage
Fle
xib
ility
Ind
ex
Percent Asphalt
Asphalt Content -vs- Avg FI
7
16
83
46
26
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Thank You
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Abdul Dahhan, P.E.
Chicago Testing Laboratory
March 14th, 2016
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SPEC
IFIC
ATI
ON
AIR
VO
ID R
AN
GE
INDIVIDUAL TESTS
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NMAS N-Design %ABR %RAP %RAS PG Grade Total AC
Content
4.75-19.0
mm
N30-N90
(SMA)
Virgin-
52.1%
Virgin-
50.0% Virgin-5.0%
[PG 58-28]-
[PG 70-28] 4.6-8.2%
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1
22
0
5
10
15
20
25
Flex
ibili
ty In
dex
Hig
her
Fle
xib
ilit
y In
dex =
Less C
rackin
g
Individual Tests
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0
5
10
15
19 mm 9.5 mm 4.75 mm
Ave
rage
FI
NMAS
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0%
10%
20%
30%
Flex
ibili
ty In
dex
CO
V
Le
ss C
OV
= M
ore
Re
peata
ble
Data
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0%
5%
10%
15%
20%
19 mm 9.5 mm 4.75 mm
Ave
rage
FI C
OV
NMAS
Le
ss C
OV
= M
ore
Re
peata
ble
Data
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0
5
10
15
20
25
Flex
ibili
ty In
dex
9.5mm Surface SMA 4.75mm Level Binder 19.0mm Binder
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0
5
10
15
20
25
Flex
ibili
ty I
nd
ex
N50 SURFACE MIXES N70 SURFACE MIXES N50 BINDER MIXES N70 BINDER MIXES
9.4 9.2
4.8
1.8
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0
4
8
12
Non-Polymer PolymerAve
rage
FI
0
4
8
12
Non-WMA Modified WMA Modified
Ave
rage
FI
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0
4
8
12
0 1 2 3 4 5 6
Fle
xib
ilit
y I
nd
ex
Hamburg Wheel Track Performance
Low Volume (ESAL)
Intermediate Volume (ESAL)
High Volume (ESAL)
Poor Performing Mixes
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0
500
1000
1500
1000 10000 100000
Flex
ibili
ty In
dex
Hamburg Wheel Track Performance
Low Volume (ESAL)
Intermediate Volume (ESAL)
High Volume (ESAL)
Poor Performing Mixes
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0
500
1000
1500
1000 10000 100000
Co
st
Perfo
rman
ce
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30w 114 Butterfield Road
Warrenville, IL 60555
P 630.393.CTL1 f 630.393.CTL7 c 815.790.5227
www.chicagotestinglab.com