HMAC Layer Adhesion Through Tack Coat

150 Pages·2017·7.49 MB·English

HMAC LAYER ADHESION THROUGH
TACK COAT
Final Report

SPR 782

HMAC LAYER ADHESION THROUGH TACK COAT
Final Report

SPR 782

By

Erdem Coleri, PhD
David Covey, Aiman Mahmoud, James Batti, and Natasha Anisimova

School of Civil and Construction Engineering
Oregon State University
101 Kearney Hall
Corvallis, OR 97331

for

Oregon Department of Transportation
Research Section
555 13th Street NE, Suite 1
Salem OR 97301

and

Federal Highway Administration
1200 New Jersey Avenue SE
Washington, DC 20590

February 2017

Technical Report Documentation Page
1. Report No. 2. Government Accession No. 3. Recipient’s Catalog No.
FHWA-OR-RD-17-05
4. Title and Subtitle 5. Report Date
HMAC Layer Adhesion Through Tack Coat February 2017
6. Performing Organization
Code
7. Author(s) 8. Performing Organization
Erdem Coleri, PhD.; David Covey; Aiman Mahmoud; James Batti; Report No. SPR 782
Natasha Anisimova
9. Performing Organization Name and Address 10. Work Unit No. (TRAIS)
School of Civil and Construction Engineering 11. Contract or Grant No.
Oregon State University
101 Kearney Hall
Corvallis, OR 97331
12. Sponsoring Agency Name and Address 13. Type of Report and Period
Covered
Oregon Dept. of Transportation
Final Report
Research Section and Federal Highway Admin.
555 13th Street NE, Suite 1 1200 New Jersey Avenue SE
14. Sponsoring Agency Code
Salem, OR 97301 Washington, DC 20590
15. Supplementary Notes
16. Abstract
Tack coats are the asphaltic emulsions applied between pavement lifts to provide adequate bond between the two
surfaces. The adhesive bond between the two layers helps the pavement system to behave as a monolithic structure and
improves the structural integrity. The absence, inadequacy or failure of this bond result in a significant reduction in the
shear strength resistance of the pavement structure and make the system more vulnerable to many distress types, such as
cracking, rutting, and potholes. In general, decisions on tack coat types and application rates are based on experience,
judgment, and convenience. For this reason, unacceptable bond performance and tack coat related premature failures
are inevitable due to the lack of quality-control and quality-assurance (QC/QA) procedures.

This research study presents a comprehensive field investigation consisting of field and laboratory testing, 3D finite
element modeling, field coring, and construction sampling of tack coats used in Oregon. Within the study, two new tack
coat materials from two companies were, for the first time, evaluated for their performance. Recommendations for the
most efficient application rates along with interlayer shear strength (ISS) prediction equations based on rheological
properties were developed. In this study, tools and methods (a wheel tracking device and a smart phone app) to reduce
tracking were also developed. Results of the evaluation will provide valuable information about correlations between
rheological tests and interlayer shear strength, as well as the effects of texture, traffic loads, and application rate on
interlayer shear strength.

In this study, the Oregon Field Torque Tester (OFTT) and the wireless Oregon Field Tack Coat Tester (OFTCT) were
also developed to evaluate the long-term post-construction tack coat performance of pavement sections. It was
determined that OFTT and OFTCT can be successfully utilized in the field to improve tack coat bond strengths.
17. Key Words 18. Distribution Statement
Tack coat, emulsions, bond strength, shear, tension. Copies available from NTIS, and online at
http://www.oregon.gov/ODOT/TD/TP_RES/
19. Security Classification (of 20. Security Classification (of 21. No. of Pages 22. Price
this report)-- Unclassified this page)--Unclassified
150
Technical Report Form DOT F 1700.7 (8-72) Reproduction of completed page authorized Printed on recycled paper
i
i
SI* (MODERN METRIC) CONVERSION FACTORS
APPROXIMATE CONVERSIONS TO SI UNITS APPROXIMATE CONVERSIONS FROM SI UNITS
When You Multiply When You Multiply
Symbol To Find Symbol Symbol To Find Symbol
Know By Know By
LENGTH LENGTH
in inches 25.4 millimeters mm mm millimeters 0.039 inches in
ft feet 0.305 meters m m meters 3.28 feet ft
yd yards 0.914 meters m m meters 1.09 yards yd
mi miles 1.61 kilometers km km kilometers 0.621 miles mi
AREA AREA
millimeters millimeters
in2 square inches 645.2 mm2 mm2 0.0016 square inches in2
squared squared
ft2 square feet 0.093 meters squared m2 m2 meters squared 10.764 square feet ft2
yd2 square yards 0.836 meters squared m2 m2 meters squared 1.196 square yards yd2
ac acres 0.405 hectares ha ha hectares 2.47 acres ac
kilometers kilometers
ii mi2 square miles 2.59 km2 km2 0.386 square miles mi2
squared squared
VOLUME VOLUME
fl oz fluid ounces 29.57 milliliters ml ml milliliters 0.034 fluid ounces fl oz
gal gallons 3.785 liters L L liters 0.264 gallons gal
ft3 cubic feet 0.028 meters cubed m3 m3 meters cubed 35.315 cubic feet ft3
yd3 cubic yards 0.765 meters cubed m3 m3 meters cubed 1.308 cubic yards yd3
NOTE: Volumes greater than 1000 L shall be shown in m3.
MASS MASS
oz ounces 28.35 grams g g grams 0.035 ounces oz
lb pounds 0.454 kilograms kg kg kilograms 2.205 pounds lb
short tons (2000
T 0.907 megagrams Mg Mg megagrams 1.102 short tons (2000 lb) T
lb)
TEMPERATURE (exact) TEMPERATURE (exact)
(F- 1.8C+3
°F Fahrenheit Celsius °C °C Celsius Fahrenheit °F
32)/1.8 2
*SI is the symbol for the International System of Measurement
i
i
i
ACKNOWLEDGEMENTS
The authors would like to thank the Oregon Department of Transportation (ODOT) for providing
funding for this research. The authors thank the members of the ODOT Project Technical
Advisory Committee and ODOT research for their advice and assistance in the preparation of
this report. In particular, Norris Shippen, Larry Ilg, Chris Harris, Anthony Boesen, Keven
Heitschmidt, and Troy Tindall participated on the TAC. The authors would like to thank Greyson
Termini of OSU for building the frames for the OFTT and OFTCT devices developed in this
study. Authors would also like to thank Shashwath Sreedhar, Blaine Wruck, Mostafa Estaji,
Sogol Haddadi, Yuqi Zhang Jeffery Knowles, Matt Haynes, and Dylan Kreiger for their help
with field testing. Special thanks to ODOT coring crew members and Wayne Brown at the
Materials lab for all their help. Authors would also like to thank Ron Depue and David Davies
for their help with field testing.

DISCLAIMER
This document is disseminated under the sponsorship of the Oregon Department of
Transportation and the United States Department of Transportation in the interest of information
exchange. The State of Oregon and the United States Government assume no liability of its
contents or use thereof.
The contents of this report reflect the view of the authors who are solely responsible for the facts
and accuracy of the material presented. The contents do not necessarily reflect the official views
of the Oregon Department of Transportation or the United States Department of Transportation.
The State of Oregon and the United States Government do not endorse products of
manufacturers. Trademarks or manufacturers’ names appear herein only because they are
considered essential to the object of this document.
This report does not constitute a standard, specification, or regulation.

iv
v