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Macro-Texture Measurements and the Performance of Chip Seals

Macro-Texture Measurements and the Performance of Chip Seals. Jose Weissmann Mariano Miguel Martino. Objective Evaluation Criteria and Main Deliverables for Project. Major distresses Flushing and Raveling What to measure? How to measure?. Major Tasks.

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Macro-Texture Measurements and the Performance of Chip Seals

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  1. Macro-Texture Measurements and the Performance of Chip Seals Jose Weissmann Mariano Miguel Martino

  2. Objective Evaluation CriteriaandMain Deliverables for Project • Major distresses Flushing and Raveling • What to measure? • How to measure?

  3. Major Tasks • Develop a scanning laser based sealcoat evaluation method • Develop a point laser based sealcoat evaluation method • Develop criteria to measure sealcoat performance

  4. Why are we concerned with Flushing and Raveling??

  5. Macro and Micro Texture

  6. Tools to Measure Macrotexture Outflow Meter Circular Texture Meter(CTM) Both ASTM Specs

  7. Outflow Meter Measurement: Time for water to flow Units: seconds

  8. Measurement: Mean Profile Depth (MPD) Units: mm CTM CTM Raw data

  9. Macro and MicroTexture FM 1283 FM 1376

  10. Data Collection

  11. 71 Roadway Sections Factorial SH127

  12. SH 132 between Lytle and Devine Excessive bleeding on both directions.

  13. Outflow Meter Measurements SH 132 between Lytle and Devine

  14. Database Contains Measurements, Photos & Location

  15. Outflow Meter and CTM Correlation

  16. Seal Coat Performance Cumulative Vehicles = 365 x ADT x Age

  17. Failure:MPD and CrashesRate of accidents/VMT 0.5 mm MTD

  18. Failure Criteria Outflow Outflow of 14 seconds

  19. Failure Criteria Performance For a road with 5,000 ADT Failure (MPD < 0.5mm) will happen at around 8 years

  20. Conclusions • Seal Coats that failed have an outflow reading greater than 14 sec (MPD<0.5mm) • The Outflow meter (inexpensive and portable) does a good job estimating MPD. • New seal coats have excellent MPD and DFT readings, Outflow readings are zero. • Failure of roads with ADT of 5,000 is consistent with current TxDOT seal coat decisions. • Research results indicate the need to monitor traffic accurately to develop better performance curves for Seal Coats.

  21. Obrigado!

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