Mn/DOT Shingle Study By Jim McGraw HMA Shingle Workshop July 12, 2006.

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Presentation transcript:

Mn/DOT Shingle Study By Jim McGraw HMA Shingle Workshop July 12, 2006

Shingle Study Objectives  Variability of Shingles  Effect on Mix & Binder  Deleterious Material

Study Mix Design

Material Variability  10 Random Samples  % Binder  PG Grading  Extracted Gradation  Deleterious Material Paper/Glass Fiber Procedures  Mixture Testing

Material Variability- Binder  RAP Average 7.0 % S.D. 0.2 %  Tear-Off Average 36.4% S.D 1.9 %  Manufacture Waste Average 19.6 % S.D. 2.3 %  5% Addition-Binder 1.0% MW, 1.8% TO TO Stiffer

Extracted Gradation  Tear Off finer on sieves less than #10  Additional Processing to remove metal  TO mixes less -#100 & #200

Extracted Gradation

Effect 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 – %

Shingle HT PG Grade  MW- Average S.D. 6.1  TO-Average S.D. 4.5  RAP- Average 76.1 S.D. 0.9

Mix 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

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

Mix 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 PG  Good low temp from RAP  % Mixing ???

Deleterious Materials  MW- Average 1.74% glass fibers with S.D of 1.15 Average of 1.34 % paper and a S.D of 0.48  Tear Off- Average 0.66 % glass fibers with S.D of 0.17 Average of % paper and a S.D of 2.12  AASHTO Spec- 0.5%

Shingle Blending Chart

TH 10 Shingle HMA- SP  PG 64-28/30% RAP - PG  PG /27% RAP and 3 % shingles PG  PG 64-28/5% shingles/25% RAP- PG  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

Conclusions  More mixture testing with true control Mix Fatigue Test Verify binder grade  Shingle Only Study Softer Binder  Field Review  Revisit present spec