Using Pavement Management Data to Determine Asphalt Pavement Performance Cycles

Transcription

1 Using Pavement Management Data to Determine Asphalt Pavement Performance Cycles 38 th Annual Rocky Mountain Asphalt Conference and Equipment Show February 23, 2011

2 Project Selection Criteria Project had to have a 10-year design life, At least ½ mile long, and Constructed between 1997 and projects met this criteria.

3 Rehabilitation Strategies Type of Treatment Number of Projects Cold planing and overlay 57 Two to four-inch overlay 73 Stone matrix asphalt overlay 17 Full depth reclamation and overlay 11 Heater scarification and overlay 21 Heater remix and overlay 19 Heater repaving and overlay 6 Cold recycle and overlay 11 Total 215

4 Performance Curves Each strategy will have rut, fatigue cracking, longitudinal cracking, transverse cracking distress curves developed for each of the following; Asphalt cement polymer or neat binder Traffic ESAL s low, moderate, and high National Highway System Project yes or no HMA Gradation S or SX Region Environmental zone cool, moderate, or hot

5 Analysis of the Data CDOT pavement management system data for each distress will be included in the analysis if the fit coefficient (R 2 ) is greater that 0.50 and has an increase in the yearly distress.

6 Analysis of the Data CDOT pavement management system data for each distress will be included in the analysis if the fit coefficient (R 2 ) is greater that 0.50 and has an increase in the yearly distress. A minimum of ten segments.

7 Pavement Management Data Data Collected in 2000 Project Constructed in 2001

8 Pavement Management Data

9 Cold Planing and Overlay Projects

10 Cold Planing and Overlay Projects

11 Cold Planing and Overlay Projects

12 Cold Planing and Overlay Projects

13 Cold Planing and Overlay Projects

14 Estimated Life Expectancy Type of Treatment Cold Planing and Overlay Performance in Years Minimum Most Likely Maximum to 4-Inch Overlay Stone Matrix Asphalt Overlay Full Depth Reclamation and Overlay Heating and Remixing and Overlay Heating and Scarifying and Overlay Cold In-Place Recycling and Overlay Overall Weighted Statewide Average

15 Important Notes The types of treatment are not intended as alternative designs for every situation. Only applicable types of treatment for a specific project should be considered in the LCCA.

16 Important Notes The types of treatment are not intended as alternative designs for every situation. Only applicable types of treatment for a specific project should be considered in the LCCA. If modified asphalt cement is used, add 1 year to the most likely value.

17 Average Yearly Increase in Distresses for Planing and Overlay Projects Rut Depth (in) Fatigue Cracking (sq. yds.) Transverse Cracking (#/tenth mile) Polymer Binder Neat Binder Low ESAL s N/A N/A N/A N/A Medium ESAL s High ESAL s NHS Non NHS Grading S Grading SX Region 1 (8) Region 2 (8) Region 3 (3) Region 4 (6) Region 5 (2) N/A N/A N/A N/A Region 6 (30) Very Cool N/A N/A N/A N/A Cool Moderate Hot Longitudinal Cracking (ln. ft.)

18 More Information programs/research/pdfs

19 Site-Specific Information

20 Site-Specific Information Date: 1975 Project # C Grading EX with AC-10 Over A-1-(a) subgrade soil

21 Site-Specific Information Date: 1989 Project # C Grading EX with AC-10 Date: 1975 Project # C Grading EX with AC-10 Over A-1-(a) subgrade soil

22 Site-Specific Information Date: 2001 Project # NH Remove 2.0 of old HMA and 4.0 Grading SX (100) with PG Date: 1989 Project # C Grading EX with AC-10 Date: 1975 Project # C Grading EX with AC-10 Over A-1-(a) subgrade soil

23 CDOT Process for Rehabilitation Selection The selection of the appropriate treatment should be based on an engineering analysis for the project.

24 CDOT Process for Rehabilitation Selection The selection of the appropriate treatment should be based on an engineering analysis for the project. 1. The designer should analyze the historical treatments on the same roadway along with their associated service life. 2. If the core and historical information is unknown, then refer to the estimated performance life for various treatments.

25 CDOT Process for Rehabilitation Selection The selection of the appropriate treatment should be based on an engineering analysis for the project. 1. The designer should analyze the historical treatments on the same roadway along with their associated service life. 2. If the core and historical information is unknown, then refer to the estimated performance life for various treatments. Note: Regional or local adjustments could be made.

26 Questions?