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Page 55
Suggested Citation:"Appendix A." National Academies of Sciences, Engineering, and Medicine. 2018. Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat. Washington, DC: The National Academies Press. doi: 10.17226/25458.
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Page 55
Page 56
Suggested Citation:"Appendix A." National Academies of Sciences, Engineering, and Medicine. 2018. Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat. Washington, DC: The National Academies Press. doi: 10.17226/25458.
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Page 56

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55 A P P E N D I X A Tasks Needed to Perform Before Construction: Calibrate the tack coat distributor truck according to ASTM D2995 (Method A) (20); Measure existing pavement surface texture according to ASTM E965 (70); Perform a manual distress survey in accordance with LTPP distress identification manual (50); and Perform FWD test throughout the test section at 50-ft. intervals. During Construction: Identify and mark the section location, and record GPS coordinates; Take pictures of the existing pavement, tack coat application, overlay construction and so forth; If possible record a video showing the sweeping practices and tack coat application; Fill out the site information sheet, Figure A-2. Measure total application rate in the field according to ASTM D2995 (Method A) (20); Collect tack coat material samples from the distributor truck in a plastic bottle (1 gallon); Measure tack coat application temperature; Identify the on-site dilution rate (if any); and After compaction identify section location for future reference and mark coring location. After Construction: Collect at least three (5.91-in.) 150-mm core samples along the right wheel path of each test section at 0-, 4-, and 12-months’ service time; Record air and pavement temperature during coring, and label the cored specimen indicating traffic direction and core number; Perform FWD test at 0-, 4-, and 12-months’ service time; and Perform a manual distress survey in accordance with LTPP distress identification manual (50) after 12-months of service. Information Need to Collect Collect construction contract and structural X-section information; Collect material and layer properties, and traffic volume; Collect mixture design data, that is, plant type, job mixture formula, RAP content, and NMAS; Collect tack coat distributor truck characteristics, that is, model, year, nozzle type, spray bar width, truck speed, and spray bar height. Figure A-1. NCHRP Project 09-40A checklist.

56 Location: GPS Coordinates: Section: Date: Time: Traffic Level: Climate Region: Air Temp.: Pavement Temp.: Contractor: Supervisor: Pavement Condition Before Tack Coat Application Cleanliness (presence of dust, water or other deleterious material): General Appearance (alligator cracks, dry, flush, rut depth, raveling, patches etc.): Surface Preparation Procedure: Overlay Information Plant Type: NMAS: RAP Content: Overlay Thickness: Number of Lanes: Design Air Void Content: Compaction Temp.: Paver Type: Compactor Type: General Comments: Figure A-2. Site information collection form.

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TRB's National Cooperative Highway Research Program (NCHRP) Research Report 878: Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat evaluates and validates a test method to determine the interlayer shear strength of asphalt pavement layers. The report includes three appendices documenting the field project checklist, photos of existing pavement distress in two states, and a summary of test data from field projects.

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