Mn/DOT Shingle StudyMn/DOT Shingle Study

By Jim McGrawHMA Shingle Workshop

July 12, 2006

Shingle Study ObjectivesShingle Study Objectives

Variability of Shingles Effect on Mix & Binder Deleterious Material

Study Mix DesignStudy Mix Design

HMA Sample

Type

Number of Samples

Percent RAP

Percent Tear-Off

RAS

Percent Manufacturer

RAS

"Control" 2 20% 0% 0%

"Tear-Off" 4 15% 5% 0%

"Manufacturer" 2 15% 0% 5%

TOTAL 8

Material VariabilityMaterial Variability 10 Random Samples % Binder PG Grading Extracted Gradation Deleterious Material

Paper/Glass FiberProcedures

Mixture Testing

Material Variability- BinderMaterial Variability- Binder RAP

Average 7.0 % S.D. 0.2 %

Tear-OffAverage 36.4%S.D 1.9 %

Manufacture WasteAverage 19.6 %S.D. 2.3 %

5% Addition-Binder1.0% MW, 1.8% TOTO Stiffer

Shingle Asphalt Content

0.05.0

10.015.020.0

25.030.035.0

40.045.0

1 2 3 4 5 6 7 8 9 10

Sample

%A

C

Manufacture Waste

Demcon Tear-Off

RAP

Extracted GradationExtracted Gradation

Tear Off finer on sieves less than #10

Additional Processing to remove metal

TO mixes less -#100 & #200

Extracted GradationExtracted GradationDemcon Tear-Off Shingle Gradation

0

20

40

60

80

100

120

0 0.2 0.4 0.6 0.8 1

Sieve to the 0.45 Power

% P

assi

ng

297

298

299

300

301

302

303

304

305

296

Manufacture Waste Shingle Gradations

0

20

40

60

80

100

120

0 0.2 0.4 0.6 0.8 1

Sieve to the 0.45 Power

% P

assi

ng

286

287

288

289

290

291

292

293

294

295

RAP

0

20

40

60

80

100

120

0 0.2 0.4 0.6 0.8 1

Sieve to 0.45 Power

% P

assi

ng

306

307

308

309

310

311

312

313

314

315

Shingle Mix Gradations

0

20

40

60

80

100

120

0 0.2 0.4 0.6 0.8 1

Sieve to the 0.45 Power

% P

assi

ng

5TO15RAP-A

5TO15RAP-B

5TO15RAP-C

5MW15RAP-A

5MW15RAP-B

5MW15RAP-C

20RAP-A

20RAP-B

20RAP-C

Effect of Hot Mix PlantEffect of Hot Mix Plant Unexpected RTFO

Losses TO- Average 1.30%,

S.D.0.4% MW- Average 0.80

S.D. 0.4% RAP-Average 0.7%

S.D. 0.1% Binder – 0.3-0.7%

Shingle RTFO Mass Loss

-2.000

-1.500

-1.000

-0.500

0.000

1 2 3 4 5 6 7 8 9 10

Sample%

Ma

ss

Lo

ss

Manufacture Waste Tear-Off RAP

Shingle HT PG GradeShingle HT PG Grade

MW- Average 141.7 S.D. 6.1

TO-Average 126.0 S.D. 4.5

RAP- Average 76.1 S.D. 0.9

Shingle High Temp PG Grade

0

20

40

60

80

100

120

140

160

180

1 2 3 4 5 6 7 8 9 10

Hig

h P

G T

emp

(d

eg C

)

Manufacture Waste Tear-Off

Mix HT PG GradeMix HT PG Grade

TO- Avg 73.2 S.D. 0.2 MW-Avg 70.9 S.D. 0.4 RAP-Avg 64.2 S.D. 0.3 MW- Full grade stiffer TO- 1 ½ grade stiffer RAP Grade - soft

Shingle HMA Binder HTPG

58.060.062.064.066.068.070.072.074.076.0

1

Sample Number

HT

PG

Gra

de

(deg

C) 001ATO

001BTO

001CTO

002AMW

002BMW

002CMW

003ARAP

003BRAP

003CRAP

Shingles LT PG Shingles LT PG

TO- Avg 1.1 S.D. 5.1 MW- Avg –11.0 S.D. 1.9 RAP- Avg –25.8 S.D. 0.7

Shingles Low PG Temp

-15.0

-10.0

-5.0

0.0

5.0

10.0

15.0

1 2 3 4 5 6 7 8 9 10

Sample

PG

Tem

p

MW- TTS TO-TTS

Mix LT PGMix LT PG

TO- Avg –28.8 S.D. 2.4 MW- Avg –26.2 S.D. 0.2 RAP- Avg –29.2 S.D. 0.9 PG 58-28- PG 60-30 Good low temp from RAP % Mixing ???

Shingle HMA Binder LTPG

-35.0

-30.0

-25.0

-20.0

-15.0

-10.0

-5.0

0.0

1

Sample NumberL

T P

G G

rad

e (d

eg C

)

001ATO

001BTO

001CTO

002AMW

002BMW

002CMW

003ARAP

003BRAP

003CRAP

Deleterious MaterialsDeleterious Materials MW-

Average 1.74% glass fibers with S.D of 1.15Average of 1.34 % paper and a S.D of 0.48

Tear Off-Average 0.66 % glass fibers with S.D of 0.17Average of 16.96 % paper and a S.D of 2.12

AASHTO Spec- 0.5%

Deleterious Materials in Shingles

0

5

10

15

20

25

1 2 3 4 5 6 7 8 9 10

Sample

% M

ass

MW Paper

MW Fibers

TO Paper

TO Fibers

Shingle Blending ChartShingle Blending ChartShingles Blending Study

0

10

20

30

40

50

60

70

80

90

0 2 4 6 8 10 12

% Shingles

Hig

h P

G T

emp

52-34 Blend 58-28 Blend 58-34 Blend

TH 10 Shingle HMA- SP 0502-09TH 10 Shingle HMA- SP 0502-09 PG 64-28/30% RAP - PG 69.5-29.8 PG 64-28 /27% RAP and 3 % shingles PG 72.5-

25.0 PG 64-28/5% shingles/25% RAP- PG 75.8-25.5 Adding 3% shingles it increases stiffness on

both ends by ½ grade over that of the 30% RAP.

Adding an additional 2% for a total of 5% increases the high end by an additional ½ grade but doesn't effect the low temp grade

Some cracking seen

ConclusionsConclusions More mixture testing with

true controlMix Fatigue TestVerify binder grade

Shingle Only StudySofter Binder

Field Review Revisit present spec