Tack Coat Rheological Properties and the Effects on Interlayer Shear Strength

Covey, David; Coleri, Erdem; Mahmoud, Aiman

doi:10.1061/(asce)mt.1943-5533.0002054

Cited by 12 publications

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“…Milling: Due to higher friction and better aggregate-to-aggregate interlock at the layer interface, milled surfaces can withstand higher shear loads than smooth overlay surfaces (3,20). Cleanliness: Dust is an unavoidable outcome of milling.…”

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“…Continuous rainfall and the slope of the roadway can result in a water flow that will remove some of the applied tack coat material during construction. In addition, standing moisture on the tack coat material might also create moisture damage at the bond after construction (3) Other factors, such as chemical and electrical characteristics of the emulsion can also affect the shear performance of the tack coat surfaces. Using stiffer binder with polymers (called engineered tack coats in this study) has been found to provide higher bond performance (3).…”

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“…In addition, standing moisture on the tack coat material might also create moisture damage at the bond after construction (3) Other factors, such as chemical and electrical characteristics of the emulsion can also affect the shear performance of the tack coat surfaces. Using stiffer binder with polymers (called engineered tack coats in this study) has been found to provide higher bond performance (3). In this study, the laboratory and numerical simulation factorials were designed to include the effects of rain, dust, coverage, emulsion type, and producer on shear performance of the tack coat layers.…”

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“…Engineered tack coats are the new tack technologies that were recently developed in Oregon to reduce tracking, the pick-up of bituminous material by construction vehicle tires. In addition, engineered tack coats were determined to have higher interlayer shear strengths when compared with the conventional CSS-1H and CSS-1 tack coat types ( 3 ). Although the engineered tack coats are about 30–40% more expensive than conventional tack coats, there definitely exists a cost–quality trade-off in choosing the emulsion type, which is of great importance for state Departments of Transportation (DOTs).…”

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“…Bonding and damage properties can also be included in the characterization of the interface. One of the most important properties of the bonded interactions is the interlayer shear strength which places a limit on the maximum shear capacity of the bond and has been evaluated in various experimental and numerical studies ( 3 , 14 ). This parameter can be defined as the maximum shear stress in the load-displacement response and determines the beginning of the shear failure.…”

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Investigation of Tack Coat Bond Damage Mechanism in Asphalt Surfaced Pavements under Dynamic Truck Loads

Estaji

Coleri

Wruck

2020

Transportation Research Record

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Bonding created by the tack coat allows the pavement system to carry heavy truck loads as a monolithic structure and improves the structural integrity. In Oregon and throughout the U.S.A., CSS-1H is the most commonly used tack coat type. However, field observations have revealed that new engineered tack coats, although more expensive, outperform the conventional types in relation to shear resistance. In this study, the impact of these new engineered emulsions on in-situ bond performance was quantified by laboratory testing and numerical modeling. Bonding damage performance of all tack coats was experimentally determined by using direct shear tests. Full-scale moving truck load models were developed and calibrated using the load-displacement parameters obtained from the laboratory shear tests. The impact of adverse construction conditions, such as dust, rain, and tack coat coverage, on tack coat bond damage under heavy truck loads was determined. It was concluded that the presence of dust had relatively the lowest contribution to shear damage. Rain during construction had the highest impact on the damage behavior and tack coat application on a wet surface increases the potential for damage by 20.1%. A 50% coverage of tack coat during construction resulted in 12.8% higher damage levels compared with 100% tack coat coverage of the surface area. Moving load models for heavy trucks caused 2.44 times more bonding damage at the bonded interface compared with the damage created by smaller trucks (F450).

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