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Roofing Shingles in HMA Lafarge Canada Inc

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									         Roofing Shingles in HMA
           Lafarge Canada Inc.



2006 National Conference, Materials and Energy Conservation for HMA,
                     Indianapolis, Nov 1-2, 2006
                 Background
• Potential benefits from the use of Scrap
  Manufacturer Shingles in HMA include:
  – Improved resistance to pavement cracking1,2,3,4
      • Due to reinforcement from fibers
  – Up to 5% shingles does not appear to affect the
    HMA low temperature performance2,3
  – Improved resistance to rutting1,2,3,4
      • Due to fibers and increased stiffness of binder
  – Is a suitable substitution for fibers in SMA2,3,4
  – Conservation of landfill space
      • Redirecting shingles from landfill and recycling
    Manufacturer vs Post Consumer

• Manufacturer                • Post Consumer
  – More uniform in content     – Contaminated with nails,
  – Asphalt is softer and         wood and other
    more functional in a          deleterious material
    paving mixture              – Asphalt is hardened from
                                  oxidation and the
                                  volatilization of the lighter
                                  organic compounds
                                – May contain asbestos
           What is MSM?

• MSMTM is Manufactured Shingle
  Modifier marketed by Lafarge
• It is produced by shredding up virgin
  shingle material direct from the
  manufacturer – not used post consumer
  tear-off material.
• It is typically produced to ½” to 3/8”
  minus material
Scrap Manufacturer Shingles
        Typical MSM Production
• Clean and Consistent
MSM Feedstock
        MSM COMPONENTS
                 TYPICAL


• 25-30% Low Penetration Asphalt Cement
  (18dmm)
• 55-65% Minus 2.36 mm Crushed Aggregate
• 15-20% Cellulose /Mineral Fibers

     Each component is used in HMA
            Mix Design Criteria
• Treat as an enhanced asphalt fiber modifier
• Use between 3 to 5% by wt. of mix
• A portion of shingle AC contributes to the virgin AC
• Increases air voids
• Typically, the total AC content is increased by 0.2 to
  0.4%
• Increases the stiffness in the mix and hence stability
• Can be used with or w/o RAP
• When used with more than 15% RAP bumping of the
  virgin AC is recommended
                   Production
• Require recycle bin
• Can be pre-mixed with RAP in proper ratio
• Batch plant - can be introduced in weigh hopper or
  boot of hot elevator (desirable)
• Drum plant – recycle collar
• Monitor moisture – keep dry
• Increase hot aggregate temperature to get desired
  HMA temperature
• Successful in running 5% shingles across the screen
  deck – run hot virgin aggregates at start-up and shut-
  down
• Use ~60,000 t of MSM each year
Lafarge – Kingston Plant
2005 NAPA Diamond Award
             Construction
• Use conventional paving equipment
• Keep rubber tire wheels hot
                 Performance

• Rut testing – Asphalt
  Pavement Analyzer
          Performance Testing

• Using OPSS HL 8 mix (virgin and MSM) and HL 3
  mix (virgin & MSM)
• CA was quarried limestone, FA 1 – natural sand, FA
  2 – limestone screenings
• Targeted 4% Marshall air voids and used PG 58-28
• Rut tests
   – Compacted beams to 7.0±1.0% air voids
   – Beams cured for a maximum 6 hours at 58C
   – Beams subjected to 100 lbs loading at 58C for
     8000 cycles
                             Table 1

      Summary of HL 8 Base Mix, APA Rut Test Results
                                                  Rut Depth
Mix No.        Description       Air Voids (%)        (mm)
  1       virgin                            6.3         11.6
  2       3%MSM                             6.6          6.5
  3       5%MSM                             7.9          4.7
  4       7%MSM                             7.8          2.5
                             HL8 w/ MSM Rut Performance Testing
                                          Figure 1
                 14.0


                 12.0


                 10.0
Rut Depth (mm)




                  8.0


                  6.0


                  4.0


                  2.0


                  0.0
                    virgin          3%MSM            5%MSM        7%MSM
                                             %MSM
                           Table 2


      Summary of HL 3 Surface Mix, APA Rut Test Results


Mix No.      Description    Air Voids (%)   Rut Depth (mm)
  1       virgin                      8.8                 21.3
  2       3%MSM                       7.6                 13.4
  3       5%MSM                       8.6                  5.0
                             HL 3 Mix w/ MSM Rut Performance Testing
                                            Figure 7


                 23.0
                 21.0
                 19.0
Rut Depth (mm)




                 17.0
                 15.0
                 13.0
                 11.0
                  9.0
                  7.0
                  5.0
                  3.0
                    virgin                    3% MSM                   5% MSM
                                               %MSM
         Demonstration Project
• July 1995, MTO Trial Project with 3% MSM in HL 1,
  HL 4 and MDBC on Hwy. 86 SBL north of Northfield
  Dr., Waterloo, Ontario
• 4000 t of MSM Modified mixes using 150-200 pen
  grade (PG 52-28)
• 19,400 AADT, LTPP Bind = PG 54.5-25.2
• Field evaluation and laboratory testing completed in
  2003
• No low temperature transverse or longitudinal cracks,
  ravelling, fatigue cracking or rutting in the modified
  surface section.
• Excellent performance
           Laboratory Testing
  Parameters        HL 1 Control,     HL 1, MSM
                   85/100 (pg 58-   modified, 150-
                        22)         200 (PG 52-28)
Recovered Pen,           25               32
      dmm
  Recovered            81-15            78-19
     PGAC
APA, Rut Depth,         7.9              5.5
       mm
 Fatigue, Nf 50%      38,643           52,352
         Stone Mastic Asphalt

• Use between 3 and 5% MSM (shingles)
• Treat as a replacement to fibers and AC
• To date performance has been excellent
                     Benefits

• Use as an enhanced asphalt fiber modifier – easier to
  introduce at asphalt plant
• Improves rutting resistance
• Improves fatigue resistance and flexural strength
• Has equal to if not better HMA durability
Thank You
Questions?
                             References
1.   Mallick, Rajib B., Teto, Mathew R., and Mogawar, Walaa. “Evaluation of Use of
     Manufactured Waste Asphalt Shingles in Hot Mix Asphalt.” Technical Report #26.
     Chelsea Center for Recycling and Economic Development, 2000
2.   Newcomb D., Stroup-Gardiner M., Weikle B., Drescher A., “Influence of Roofing Shingles
     on Asphalt Concrete Mixture Properties.” Report MN/RC-93/09, University of Minnesota,
     Dept. of Civil and Mineral Engineering, June 1993
3.   Ross, B.,”An Evaluation of The Use of Hot Mixed Asphalt Pavements Containing Roofing
     Shingle Material in North Carolina”, presented to the North Carolina Department of
     Environment, Health and Natural Resources, Raleigh, North Carolina, 1997
4.   Lum, P., Greco, M., Yonke, E. “Field Performance and Laboratory Evaluation of
     Manufactured Shingle Modifier in HMA”, Canadian Technical Asphalt Association, 2004

								
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