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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-monthsâ 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-monthsâ 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.