NCHRP Project 9-40 Update Optimization of Tack coat for HMA Placement
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1 NCHRP Project 9-40 Update Optimization of Tack coat for HMA Placement Louay N. Mohammad Louisiana Transportation Research Center Louisiana State University Emulsion: Design, Construction, and Performance Seminar July 1, 2008 Baton Rouge, Louisiana
2 What is a Tack Coat? Light application of asphalt, usually asphalt diluted with water. Used to ensure a bond between the surface being paved and the overlying course TOP Layer interface BOTTOM Layer
3 What is NOT A BOND? DEBONDING TOP Layer interface BOTTOM Layer Loss of ADHESION and/or INTERLOCK at the interface: high shear stresses τ road loads Long term pavement performance and durability can be affected by Debonding as well as Rutting and Cracking.
4 Common Tack Coat Materials Hot AC ( AC-20, AC-30, ) Emulsified Asphalts ( SS-1, SS-1h, CRS-2, CSS-1h, ) Cutback Asphalts ( RC-70, RC-250, )
5 Why is Tack Coat Used? Bind two pavement layers Monolithic structure withstand/transfer shear stresses from traffic loading Lack of bond between the wearing and binding layers Cause slippage activate distress mechanisms and rapidly lead to total failure interface.subgrade Base AC Shear Stress (psi)
6 Objective Determine for the various uses of tack coats optimum application methods, equipment type and calibration procedures, application rates, and asphalt binder materials Recommend revisions to relevant AASHTO methods and practices related to tack coats
7 Survey Worldwide survey was conducted to determine various tack coat practices Sections: Tack Coat Materials Tack Coat Application Methods Characterization of Tack Coat Application 27 Questions
8 Literature Review - States Responded 46 state DOTs, Washington D.C. 5 Provinces in Canada. Other countries Denmark Finland South Africa Netherlands
9 Development of Test Equipment Tack Coat Quality» Equipment Development Interface Bond Strength» Equipment Development
10 Characterization of Tack Coat Quality Torsion Tension
11 Time Characterization of Tack Coat Quality Louisiana Tack Coat Quality Tester -- LTCQT Developed equipment Tack coat quality -- residual Tension User friendly, Easy to use Laboratory and field Draft test method in AASHTO format Tensile load Displacement Tensile Force Time Force
12 Characterization of Interface Bond Strength
13 Characterization of Interface Bond Strength Direct Shear Torsion
14 Interface Bond Strength Test Louisiana Interlayer Shear Strength Tester (LISST) Developed equipment Interface Bond Strength Shear Easy to use Portable Adoptable to exiting load frames Reasonable cost accommodate both 100 and 150-mm sample diameter Draft test method in AASHTO format
15 Pavement surface types: existing HMA, milled HMA, and PCC Surface Condition: clean and dirty/dusty Wet and Dry Tack coat material types Hot AC» PG Emulsion Factors Considered Experiment To Study Tack Coat» CRS-1, Trackless, SS-1h, SS-1 Application rates (residual): high, medium, and low Surface coverages by tack coat: 100% and 50%
16 Factors Considered Experiment To Study Tack Coat Surface Type: HMA PCC Milled Tack Coat Type PG SS-1h CRS-1 Trackless No Tack PG SS-1h SS-1 SS-1h SS-1 Coverage Rate & 100% 50 & 100% 100% 100% 100% 100% 100% 100% 100% Residual Rate (gal/yd 2 ) Surface Condition Wet & Dry Wet & Dry Dry Dry Dry Wet & Dry Wet & Dry Dry Wet & Dry Dry Cleanliness High & Low High & Low High High High High High High High High Temperature F 77 F 77 F 77 F 77 F 77 F 77 F 77 F 77 F 77 F Normal Load & 20 psi 0 & 20 psi 0 & 20 psi 0 & 20 psi 0 & 20 psi 0 & 20 psi 0 & 20 psi 0 & 20 psi 0 & 20 psi 0 & 20 psi Replicates Subtotal Total Grand Total
17 Experiment To Study Tack Coat
18 Survey of Test Lanes Surface texture measurement Sand Patch Method, Road Surface Profiler Circular Texture (CT) Meter
19 Distributor Truck Calibration Equipments Asphalt Products Unlimited, Inc Computerized tack coat distributor truck Etnyre, Model 2000
20 Distributor Truck Calibration Geotextile Pad layout ASTM 2995 One transverse direction and two longitudinal directions Longitudinal 2 18 Longitudinal Transverse 1 Left Wheel of Truck ft 5 ft Right Wheel of Truck
21 Distributor Truck Calibration Direction of Truck
22 Lane Layout Existing HMA Surface gsy CRS-1 100% Coverage gsy gsy gsy gsy Trackless 100% Coverage gsy gsy gsy gsy SS-1h 50% gsy Coverage gsy SS-1h 100% gsy Coverage
23 Spray of Emulsion 100% Coverage 50% Coverage
24 Overlay Construction Material Transfer Vehicle
25 Video Presentation Emulsion Spray Tack Coat Quality Testing Overlay Construction Coring Interface Bond Strength testing
26 Interface Shear Strength 25C Existing HMA Surface, 100% Coverage CRS-1 SS-1H Trackless Shear Strength (psi) No Tack Low Med High
27 Acknowledgement APU Distributor Truck SS-1h, CRS-1 Costal HMA Overlay Blacklidge Trackless
28 T H A N K Y O U
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