AASHTO T 361:2016 Standard Method of Test for Determining Asphalt Binder Bond Strength by Means of the Binder Bond Strength (BBS) Test.
Solid Aggregate Substrates—Cut aggregate substrates from either quarried rocks or cored rock samples using standard rock saws such that the plate faces are parallel. Lap all substrates using a 280-grit silicon carbide material on a standard lapidary wheel to remove saw marks and ensure a consistent surface roughness. Once cut and lapped, clean the samples for 60 mm in an ultrasonic cleaner containing distilled water at a temperature of 60 ± 1°C (140 ± 2°F) to remove residual particles on the plate surface. Limit the use of the same solid aggregate substrate to five times per cut surface.
Note 3 When large aggregate samples are not available, composite substrates can be made from aggregate chips and a rapid-setting cement compound. Prepare composite substrates by casting samples in molds with dimensions that meet or exceed requirements. Cure samples according to the cement compound manufacturer’s instructions. After curing, cut, lap. and clean the composite substrates according to the procedures provided in Sections 9.1 and 9.2. Inspect the surface of the cut sample; it should be composed primarily of aggregate and free of large air voids. Limit the use of the same composite substrate to five times per cut surface.
9.2. Substrate Dimensions— Cut solid aggregate or aggregate composite substrates to a minimum thickness of 20 mm (0.8 in.) and dimensions that provide sufficient surface area for placement of four pull-off stubs on one substrate. A minimum center-to-center spacing between the two pull-off stub shafts of 73.0 mm (2.87 in.) is required for clearance of the load assembly.
Note 4 Asphalt Mixture Substrates. Asphalt mixture core samples obtained from field sites are not used as a substrate due to deviations in surface roughness, which does not allow for uniform binder film thickness. For laboratory asphalt mixture specimens prepared using a Superpave gyratory compactor, lapping surfaces will damage the lapidary equipment and is not recommended.
Hot-Applied Binders and Em u/si/led Asphalt Residues:
10.1.1. Obtain a representative sample of the material for testing using the procedures specified in R 66. Handle materials and instruments with clean laboratory gloves throughout the test procedure to prevent contamination of the testing surfaces.
10.1.2. Place the substrates and the pull-off stubs in a forced-draft oven at 150 ± 2°C (302 ± 4°F) for a minimum of 30 mm to remove any residual moisture from the substrate surface and to preheat the pull-off stubs for application. For emulsified asphalt residues place the substrates and pull-off stubs in a forced-draft oven at 80 ±2°C (176 ± 4°F).AASHTO T 361 pdf download.