ncaupg march 18, 2016 - purdue universityncaupg/activities/2016...mix design review inflated gsb...
TRANSCRIPT
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Longitudinal Joints and Indiana Update
NCAUPG March 18, 2016
Matt Beeson, P.E.
INDOT Office of Materials Management State Materials Engineer
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INDOT Joint Specification Joint failures 2010 DOT/Industry Committee
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INDOT Joint Specification Construction method specs?
Notched wedge Plate Compactors Joint Compactors
Industry experience was negative Question of whether density really improved Also constructability questions
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INDOT Joint Specification Joint Density specification?
More core holes (at the joint!) Taking cores directly over the joint
problematic What Gmm to use? Joint isn’t vertical
Another pay factor
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INDOT Joint Specification Joint Adhesive
Hot applied Top two lifts (intermediate and surface)
Fog Seal Emulsion 1 ft. on each side of joint
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INDOT Joint Specification
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Centerline Rumble Stripes
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Centerline Rumble Stripes
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Centerline Rumble Stripes
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Centerline Rumble Stripes
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Longitudinal Joints
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Longitudinal Joints Better ideas? Still a problem?
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What’s going on in Indiana? HMA mixes seem low on binder
Why?
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Aggregate Gsb 2013
Mix Design review Inflated Gsb values
2014 Designs required to use INDOT Gsb
5 year moving average of data Fixed value for RAP (2.640)
Unless outside of 2.600-2.680
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Mix Design
19.0 mm mixture Gsb = 2.665 Gmm = 2.490 Gmb = 2.390 Pb = 4.1 VMA = 13.6%
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Mix Design
19.0 mm mixture Gsb = 2.665 Gmm = 2.490 Gmb = 2.390 Pb = 4.1 VMA = 13.6%
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Mix Design
19.0 mm mixture Gsb = 2.665 Gmm = 2.490 Gmb = 2.390 Pb = 4.1 VMA = 13.6% Gse = 2.651
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Mix Design
Gsb = 2.665 Gse = 2.651
Pba = -0.20%
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Mix Design
Pba = -0.20% Negative Absorption
Obviously doesn’t happen Absorption actually happens when mix
is produced Where does it come from? The effective asphalt content!
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Reality
19.0 mm mixture Real Gsb = 2.600 2.665 Gse = 2.651 Real Pba = 0.76% -0.20% Real VMA = 11.8% 13.6%
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Reality
How much more binder? Incorrect Pba = -0.20% Real Pba = 0.76% 0.76% - (-0.20%) = 0.96% Pb = 4.10% + 0.96% = 5.06%
“Binder Deficient” by almost 1.0%
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Problem Solved?
Gsb list since 2014 Mix design Gsb is much more
accurate Another loophole First example – Gsb inflation Next example – Gse deflation
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Mix Design
19.0 mm mixture Gsb = 2.600 Gmm = 2.430 Gmb = 2.332 Pb = 4.1 VMA = 14.0%
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Mix Design
19.0 mm mixture Gsb = 2.600 Gmm = 2.430 Gmb = 2.332 Pb = 4.1 VMA = 14.0%
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Mix Design
19.0 mm mixture Gsb = 2.600 Gmm = 2.430 Gmb = 2.330 Pb = 4.1 VMA = 14.0% Gse = 2.579
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Mix Design
Gsb = 2.600 Gse = 2.579
Pba = -0.32%
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Reality
19.0 mm mixture Gsb = 2.600 Real Gse = 2.651 Real Pba = 0.76% -0.32% Real VMA = 11.8% 14.0%
However, this time, VMA was actually
measured in the field as 11.8% Only 10% of pay!
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Delta Pb
Compute combined H2O absorption Estimated Pba = 65% H2O
Compare design Pb to estimated Pb We are calling this “Delta Pb” Currently ΔPb ≤ 0.4% = OK
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Statewide Total Binder Content
9.5 mm 2013 2014 2015
Mean 5.6 5.8 5.9
12.5 mm 2013 2014 2015
Mean 5.0 5.4 5.5
19.0 mm 2013 2014 2015
Mean 4.4 4.5 4.8
25.0 mm 2013 2014 2015
Mean 4.1 4.2 4.4
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Vbe = Durability
VMA = Important Do you really know what your VMA
(Vbe) is? Is the Gsb accurate? Does the Gsb match the material used? Is Pba reasonable? Did materials change in production?
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What are we doing next?
Pay factors rebalance to emphasize VMA
Continue using Gsb list for designs Track Gse from design to field
If Gse changes, verify Gsb
Turns out Gsb testing is reliable from an extracted HMA sample
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Extracted Aggregate Gsb
Batched 18 samples “Dummy” mix design 2000g stone
+4 only
1000g sand -4 only 500g/500g stone sand/nat. sand
T84/T85
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Extracted Aggregate Gsb
4.5% AC 0, 2, 4, 6 hr. STOA per R 30 Centrifuge extraction w/ TCE Separate +4, -4 Rerun T84/T85
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Extracted Aggregate Gsb
2.6
2.605
2.61
2.615
2.62
2.625
2.63
2.635
2.6 2.605 2.61 2.615 2.62 2.625 2.63 2.635
Bef
ore
Extr
acti
on
After Extraction
Total Sample
No Aging
No Aging - 1000g Stone Sand
No Aging - 500g Stone Sand/500g Natural Sand
2 Hour Aging
4 Hour Aging
6 Hour Aging
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Extracted Aggregate Gsb
0.85
0.95
1.05
1.15
1.25
1.35
1.45
0.85 0.95 1.05 1.15 1.25 1.35 1.45
Bef
ore
Extr
acti
on
After Extraction
Total Sample
No Aging
No Aging - 1000g Stone Sand
No Aging - 500g Stone Sand/500g Natural Sand
2 Hour Aging
4 Hour Aging
6 Hour Aging
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Extracted Aggregate Gsb
2.500
2.550
2.600
2.650
2.700
2.750
2.800
2.500 2.550 2.600 2.650 2.700 2.750 2.800
Test
ed
Expected
65 designs 137 tests
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Extracted Aggregate Gsb
2.500
2.550
2.600
2.650
2.700
2.750
2.800
2.500 2.550 2.600 2.650 2.700 2.750 2.800
Test
ed
Expected
n ≥ 2 28 designs 96 tests
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What are we doing next?
We want to measure properties as accurately as possible Air Voids, Density already reliable VMA will now be (more) reliable
Further trials with Superpave5 to improve durability
Look at performance testing