effects of rap-ras in mixes october 2011 · rap 5.0 (0.75) 87 15.0 76.6 combined grade. produced...
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Richard S. Williammee, Jr., MSCE, P.E.
TxDOT Fort Worth District
2011 Transportation Short Course October 12, 2011
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RASRAP RASRAP
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~ 10 million tons of 10 million tons of Hot Mix Asphalt produced for TxDOTproduced for TxDOT each year.
832,000+ tons of RAP used in HMAC in 2010.
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12 Districts (48%) allowed the use of RAP in hot mix h l i 2006asphalt in 2006.
Districts reluctant to use RAP in hot mix asphalt due to high variability indue to high variability in AC content and gradation.gradation.
Single RAP stockpiles Single RAP stockpiles segregated.
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• Approximately 13 million tons of asphalt shingle waste i t dis generated per year– Post manufacture (scrap): 1 5 million(scrap): 1.5 million tons
– Post consumer (tear‐(off): 11.5 million tons
• Less than 5% of shingle waste is recycled
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Asphalt 5 0%
Fibers 2.5%5.0%
Asphalt24%Fine Agg.
72.5%Fine Agg.
35 0%Coarse Agg.
60 0% 35.0%60.0%
RASRAP RASRAP
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PG 64 22
PG GradeBinder AC %
5 267PG 64-22
RAS
5.2
24.0
67
96
RAP 5.087
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PG GradeBinder AC % % in Mix
PG 64-22
RAS
5.2 (4.2)
24.0
67
96
RAP 5.0 (1.0)87 20.0
Combined Grade70.8
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PG GradeBinder AC % % in Mix
PG 64-22
RAS5.2 (4.0)
24.0 (1.2)
67
96 5.0RAP 5.0
( )
87
Combined Grade73.7
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PG GradeBinder AC % Mix %
PG 64-22
RAS
5.2 (3.25)
24.0 (1.2)
67
96 5.0RAP 5.0 (0.75)
( )
87 15.0
Combined Grade76.6
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Be proactive Improve quality Improve quality Reduce costs Comply with FHWA regulations Technolog impro ements Technology improvements Green Agency (reduce the carbon footprint)
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TxDOT Administration seeing “doom and gloom” for the overall budget and looking for waysto save money now in all areas.
Material Costs –o Asphalt prices -
Then: PG 64-22 cost $163/liquid ton.Now: PG 64-22 costs $575/liquid ton.
o Aggregate prices – definite price increase $500 million spent annually on HMAC.
10% cost reduction is a significant savings.
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RAP, RAS, WMA, Tire rubber, In-Place recycling -new products used to lower current mix costs
Grade dump (softer asphalt grades to addresscracking)g)
Pave-IR to improve consistent temperaturesWMA to lower temperatures and reduceWMA to lower temperatures and reduce
oxidation plus lower fuel costs
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Variable and Contaminated RAP
RAS Clumping
Higher graded asphalt for rutting
Early asphalt oxidation Early asphalt oxidation
Early pavement cracking
Lower cost
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90
100
70
80
50
60
ent P
assi
ng
30
40Per
ce Maximum Density Line
10
20
0Sieve Size
1 2 3 4 5 6 Avg.
#200 #80 #50 #40 #30 #10 #8 #4 3/8" 1 /2" 5/8" 3/4" 7/8" 1" 1 1/4"
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Reclaimed Asphalt Pavement (RAP)p ( )
Fractionating RAP into 2 or more stockpiles can g psignificantly improve variability.
Gradation and composition ofcomposition of fractionated RAP are typically consistent in size and quality.
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Uniform & Consistent
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-1/2" Inch RAP90
100
70
80Maximum Density Line
50
60
cent
Pas
sing
30
40Per
c
10
20
0Sieve Size
1 2 3 4 5 6 7 8 9 10 1112 13 14 15 16 17 18 19 20 Avg.
#200 #80 #50 #40 #30 #10 #8 #4 3/8" 1 /2" 5/8"
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PG GradeBinder AC % Mix %
PG 64-22
RAS
5.2 (3.25)
24.0 (1.2)
67
96 5.0RAP 5.0 (0.75)
( )
87 15.0
Combined Grade76.6
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Produced and Placed August 25Photo taken August 26
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Ways to mitigate RAP/RAS concerns:y g
increase the target lab density to get more
total asphalt binder into the mixp
start with a lower base asphalt grade to
lessen crackinglessen cracking
utilize a crack measurement test such as the
Overlay Tester to establish an objectiveOverlay Tester to establish an objective
cracking criteria
use WMA to improve mixing and compaction use WMA to improve mixing and compaction