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Garth D. Bridenbaugh, P.E. Pennsylvania Department of Transportation

Longitudinal Joint Density Test Results Dec ember 12, 2012. Garth D. Bridenbaugh, P.E. Pennsylvania Department of Transportation BOPD, Innovation & Support Services Quality Assurance Section. How Far Have We Come?. Impact on Lot Payment Summary. +$5,000. -$12,000. Disincentive.

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Garth D. Bridenbaugh, P.E. Pennsylvania Department of Transportation

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  1. Longitudinal Joint Density Test Results December 12, 2012 Garth D. Bridenbaugh, P.E. Pennsylvania Department of Transportation BOPD, Innovation & Support Services Quality Assurance Section

  2. How Far Have We Come?

  3. Impact on Lot Payment Summary +$5,000 -$12,000 Disincentive Incentive No Pay Adjustment 0 50 100 80 PWT

  4. 2012 Statewide Pay Impacts 158 density lots on 51 projects (773 cores) 75% bonus lots 18% no pay adjustment 7% penalty lots $468,300 total bonus $62,976 total penalty

  5. Corrective Action Lots with avg. density < 88% Gmm require corrective action Contractor must seal the joint with PG 64-22 at no cost to Department 4 lots of 158 required corrective action in 2012

  6. US 322

  7. US 422

  8. Interstate 79

  9. Warm Mix vs Hot Mix

  10. Notched Wedge vs Vertical

  11. By Highway Classification

  12. Crowned vs Uncrowned Roadways

  13. Mix Size and Type

  14. 2011-12 Bonus/Penalty by Individual Contractor Total bonus = $729,925 Total penalty = $162,192

  15. More 2011-12 Joint Density Info. 686 linear miles of joint tested 1450 joint core samples 93 total projects statewide 30 different paving contractors Notched Wedge Joint Core Hole

  16. Where is PennDOT Heading? Raising the lower specification limit from 89% to 90% for joint density Lots ≥92.0% avg. density, full bonus Lots ≥89.0% but <90.0% avg. density, penalty cap of $1,000 per sublot

  17. 2012 Test Results 2012 results under proposed changes: 52% bonus (was 75%) 30% no adjust. (18%) 18% penalty (7%) Bonuses still more than double penalty $

  18. Why Joint Density? Lower permeability reduces chance for moisture damage Higher density reduces the permeability of the pavement in place.

  19. Keeping water out of our joints • Most research suggests that… • densities should be about 92% to minimize permeability • Joint densities below 90% begin to see an exponential increase in permeability as density decreases

  20. Various Studies on Permeability Chart excerpted from NCHRP Project 9-27 September 2004

  21. Joint Density Spec. Impacts Overall 3.7% increase in joint density (87.8% to 91.5%) since outset in 2007 Improved joint density is expected to lead to better long term performance Doesn’t solve all problems Anticipated lower maintenance costs Congratulations on a job well done, let’s take the final step forward!

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