01124244

Component

https://doi.org/10.3141/2126-01

http://scholar.google.com...cman&publication_year=2009

The results presented in this paper are part of NCHRP Project 9-40 on the Optimization of Tack Coat for Hot-Mix Asphalt Placement. This paper presents the development of a new test device, the Louisiana Tack Coat Quality Tester (LTCQT), for evaluating the quality of the bond strength of tack coat in the field. LTCQT is a modification of the ATacker device. A test matrix was developed to evaluate the reliability and the repeatability of the LTCQT in the field. Three emulsified tack coats (CRS-1, SS-1h, and Trackless) and an asphalt cement (PG 64-22) were evaluated over a wide range of temperatures and at a residual application rate of 0.23 L/m². Two key test parameters were determined to characterize the mechanical responses of tack coats: the optimum testing temperature and the maximum tensile strength test. Results indicated that the LTCQT can successfully be used in the field to measure the quality of the bond strength of tack coat and to distinguish between the responses of the evaluated tack coats. A good correlation was observed between the absolute viscosity of residual tack coat material and the tack coat tensile strength. This study shows that the softening point can be an adequate parameter to determine the optimum temperature for the tack coat pull-off test, and therefore pull-off testing at the softening point temperature of the residual binder material is recommended for field tack coat evaluation.

01147489

09-2285

English

pp 1-11

2009

Transportation Research Record: Journal of the Transportation Research Board

9780309142564

Print

Figures; Photos; References (10) ; Tables (3)

Asphalt cement; Bituminous materials; Bond strength (Materials); Field tests; Quality control; Reliability; Tack coats; Temperature; Tensile strength; Testing equipment; Viscosity

Pull-off method; Repeatability

Louisiana

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Jan 30 2009 6:38PM

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• Effect of Crumb Rubber Bituminous Mixes on Functional Characteristics of Road Pavements
• Effects of Warm-Mix Asphalt Additives on Workability and Mechanical Properties of Reclaimed Asphalt Pavement Material
• Evaluation of Warm-Mix Asphalt Produced with the Double Barrel Green Process
• Field and Laboratory Forensic Analysis of Reflective Cracking on Massachusetts Interstate 495
• Investigation of Fiber-Modified Bituminous Mixes
• Laboratory and Field Evaluations of Foamed Warm-Mix Asphalt Projects
• Laboratory Investigation of Moisture Damage in Warm-Mix Asphalt Containing Moist Aggregate
• Modeling of Repeated Creep and Recovery Experiments in Asphalt Binders
• Performance of Polymer-Modified Asphalt Mixture with Reclaimed Asphalt Pavement
• Practical Use of Multiple Stress Creep and Recovery Test: Characterization of Styrene–Butadiene–Styrene Dispersion and Other Additives in Polymer-Modified Asphalt Binders
• Testing of Moderate and High Reclaimed Asphalt Pavement Content Mixes: Laboratory and Accelerated Field Performance Testing at the National Center for Asphalt Technology Test Track
• Virginia’s Higher Specification for Reclaimed Asphalt Pavement: Performance and Economic Evaluation