Optimization of Tack Coat for HMA Placement (2012) / Chapter Skim
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Appendix E - Standard Test Procedure for Measuring Interface Bond Strength in the Laboratory Using the LISST
Appendix E - Standard Test Procedure for Measuring Interface Bond Strength in the Laboratory Using the LISST
Pages 98-105
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E-1 A p p e n d i x e Standard Test Procedure for Measuring Interface Bond Strength in the Laboratory Using the LISST
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E-2 E-2 Proposed Standard Method of Test for DETERMINING THE INTERLAYER SHEAR STRENGTH OF ASPHALT PAVEMENT LAYERS AASHTO Designation: TP XX-XX Proposed test method under review before submitting to AASHTO Subcommittee on Materials American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C.
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R EFERENCED D OCUMENTS 2.1. AASHTO Standards: T 166, Bulk Specific Gravity Of Compacted Hot Mix Asphalt Using Saturated Surface- Dry Specimens T 168, Sampling Bituminous Paving Mixtures T 209, Theoretical Maximum Specific Gravity and Density of Hot Mix Asphalt T 269, Percent Air Voids in Compacted Dense and Open Asphalt Mixtures T 312, Preparing and Determining the Density of Hot Mix Asphalt (Hma)
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APPARATUS 6.1. Interlayer Shear Strength Tester - The device used for the interlayer shear strength test shall be designed such that it adapts to any universal testing machine, has a nearly frictionless linear bearing to maintain vertical travel, accommodates sensors that measure the vertical and horizontal displacements, provides specimen locking mechanism, applies consistent normal loads, and accommodates 100- and 150-mm sample diameters.
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Wet masonry saw. Vertical Sensors Loading Frame Reaction Frame E-5 Horizontal Sensor Normal Load Actuator Figure 2.–Front and side view of the LISST device.
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To prepare laboratory samples, compact a cylindrical specimen 150 mm in diameter with a thickness of 50 mm using the Superpave Gyratory Compactor by AASHTO T312. Brush the tack coat material on the top of the prepared specimen.
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CALCULATIONS 10.1. Calculate the interlayer shear strength, ISS, as follows: where: ISS = interlayer shear strength, Pa Pult = ultimate load applied to specimen, N D = diameter of test specimen, m 11.
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K EYWORDS 13.1. Interlayer Shear Strength, Asphalt Overlay, Tack Coat, Shear Strength, Slippage Failure.
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