Measure of Density Joe Schroer, PE North Central HMA Conference - PowerPoint PPT Presentation

Jan 18, 2023 •310 likes •485 views

Asphalt Permeability As A Measure of Density Joe Schroer, PE North Central HMA Conference February 3, 2009 Why The Interest In Permeability? Non-destructive Test Test Results Quicker, Can Be Performed Multiple Times Most

Asphalt Permeability As A Measure of Density Joe Schroer, PE North Central HMA Conference February 3, 2009
Why The Interest In Permeability? • Non-destructive Test • Test Results – Quicker, Can Be Performed Multiple Times • Most Pavement Designs Assume An Impermeable Surface
http://library.modot.mo.gov/RDT/reports/Ri07053/or09017.pdf
Project Questions Permeability testing to replace or supplement AASHTO T166? Which permeability test? Integration of permeability testing into PWL?
Density Tests
Field Tests
Lab Test
9.5 mm 12.5 mm 19 mm 25 mm SMA
AASHTO T166 vs. NCAT 7000 6000 y = 3.3007x 2 + 201.55x - 749.62 NCAT Permeability, 10^-5cm/sec R² = 0.2656 5000 4000 3000 2000 1000 0 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 -1000 AASHTO T166 Air Voids, percent
CoreLok vs. AASHTO T166 16.0 14.0 AASHTO T166 Air Voids, percent 12.0 10.0 8.0 y = 0.9283x R² = 0.9383 6.0 4.0 2.0 0.0 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 CoreLok Air Voids, percent
Sensitivity of PWL to USL for the NCAT Permeameter
Findings • Reasonable criteria for implementing permeability testing as part of PWL specifications has been established – NCAT: 0, 1560 X 10 -5 cm/sec (44.2 ft/day) – KY: 0, 325 X 10 -5 cm/sec (9.2 ft/day) – K-W: 0, 530 X 10 -5 cm/sec (15.0 ft/day)
Recommendations • NCAT and KY Preferred Over Karol- Warner – In-situ testing – Quicker test results for use in decision making – Non-destructive • NCAT Preferred Over KY - Commercially Availability (Cool down not required either)
Mix Type vs. Permeability & D/B
Proposed MoDOT Specifications 403.5.2 Density. The final, in-place permeability of the mixture shall be a maximum rate of 42.0 feet per day for all mixtures except SMA. SMA mixtures shall have a maximum rate of 3.5 feet per day. Tests shall be taken not later than the day following placement of the mixture. The engineer will randomly determine test locations. *Tests shall be performed at random locations within each half-sublot.
Joe Schroer Field Materials Engineer Missouri Dept. of Transportation PO Box 270 Jefferson City, MO 65102 573.526.4353 Joe.Schroer@modot.mo.gov

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