The Discussion. WV s Observations Literature Review. SEAUPG Annual Meeting Williamsburg, VA Thursday, November 19, 2015

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1 Strength Testing of Tack Coats 21 SEAUPG Annual Meeting John E. Crane P.E. West Virginia DOH Materials Thursday November 19th, 21 The Discussion WV s Observations 213 WVDOH Asphalt Specification Changes Developing and Supporting the Bond Spec The last few years Tack Coat Applications Studies 216 Looking into the future WV s Observations Stagnant Funding Available Pavement Funding is Decreasing Asphalt Design Thicknesses Decreasing Poor Tack Efforts Failures Slippage Delamination Cracking Reduced Pavement Life 212 WVDOH Specification Changes Management Ultimatum Interstate Projects Asphalt Super Specification Square Yard Payment Thickness Cores Percent Within Limits %AC Gradation Control Density (Mat and Joint cores) Bond Strength Cores Developing and Supporting the New Bond Strength Specification How to best test the bond Literature Review Three main types of bond strength testing devices WVDOH Literature Review Torsion Device WVU Research Tension Device Direct Shear Device 1

2 Demo from Road Science Visited MCS&T in Feb of 213 Field Bond Device 2 core Direct Shear Devices Measures the force required to break a double layered sample. Key Research Studies West et al. (2) NCAT Bond Strength Device (2 psi normal) McGhee and Clark (29) VDOT Shear Device Kim et al. (211) Layer Parallel Direct Shear Tran et al. (212) Florida DOT Shear Test Mohammad et al. (212) Louisiana Interlayer Shear Strength Tester (LISST) (1psi normal) Key Findings Direct Shear testing is most common Marshall Stabilometer Temperature affects bond strength Most researchers use shop fabricated loading heads ALDOT MP was the most thorough test method Lab samples exhibit higher bond strengths Choosing our Requirements NCAT Report No Evaluated failed sections Found a window of 87 to 1 psi between failure and acceptable results Recommended 1 psi WVU Research aligned Our Specification and Shear Device Spec was based off ALDOT-4 Device was modeled off of the NCAT and LPDS devices Holds a 6 inch core Shear gap of ¼ 1 psi Minimum No Normal force Utilizes the Marshall Stabilometer Clamps to secure sample tightly Lightweight aluminum design Building our Shear Device Proof of Concept Device 2

3 Disclaimer Looking Back 213 MP Guide to Determining Interface Bond Shear Strength of Multilayered Asphalt Pavement Specimens 213-present Shadow spec No bid item for a tack coat No Penalty for Good Tacking Effort Looking Back Interstate/APD Projects 2 PWL Shadow Spec testing 4 Full PWL testing Total Cores = 18 Looking Back Began using Fine milling 4 Interstate Projects Total Cores = 231 Looking Back - 21 No changes to Specifications 1 Interstate/APD Projects Total Cores = 38 Total of 796 cores 3

4 Sample Integration Results 2 Ton Lots Compiled results for 8 cores Ton Sub-lots Lot-by-Lot payment PWL 4 213Distribution of Bond Strength 3 Bond Strength Distribution Frequency Percent of Total Bond Strength () Base to Wearing Milled to Base Combined Bond Strength Distribution Bond Strength Distribution Percent of Total Percent of Total

5 Results Percentage above NCAT recommendations % 8 % 68 % 1+ 4 % 6 % 6 % Percent of Total Milled Surface Bond Strength Distribution Milling differences Fine Milling Traditional Double Lift Single project 3 Application rates 21 Held a Tack Coat best practices workshop 12 / industry/ state 3 Application rates studies AK Guam HI CA OR 214 Pilot, VA Completed () Scheduled (16) Requested (7) Have not Requested (1) Tack Coat Workshops WA NV ID AZ UT MT WY NM CO ND SD NE TX KS OK MN IA MO AR LA WI IL MS MI IN TN AL KY Jason Dietz (FHWA) OH GA WV SC FL PA VA NC VT NY PR ME NH MA RI CT NJ DE MD DC VI Outcomes From Workshops FHWA Best Practices Tech Brief (Dec. 21) AASHTO SOM Specification Was Submitted Increasing Application Rates DOT Specification Revisions Verifying Calibration of Distributor Treat Tack as Separate Pay Item vs. Incidental Item Jason Dietz (FHWA)

6 WVDOH App Rate.8%.%.2% Actual.6%.21%.23% Film Thick 6mil 1mil 22mil Project 1 I-79 6 Application Rates 36 Bond Cores Applied Calculated Film Thickness Mil Bond Strength? ??? 6

7 Bond Strength () Project 1 Bond Testing y = 1.83x R² = Calculated Application Rate Project 2 - US Route Application Rates 3 Cores Scratch/Delamination issues Applied Calculated Film Thickness Mil Bond Strength Project 3 US Route 6 through downtown Charleston 4 Application rates 12 cores Applied Calculated Film Thickness Mil Bond Strength Looking into the Future Changes??? 216 Continued Research Tack Applications rates Further bond testing Calibrations of Tack Trucks Coring major jobs prior to bid to determine weak interfaces to avoid delamination 217 Begin using bond testing as a pay deduction Make tack a separate pay item 7

8 I believe we have BONDED long enough! Lets BREAK!! Speaking of Bonding Questions? 8

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