NECEPT Asphalt Questions with Correct Answers

Gmb - ANSWERSSpecific gravity of compacted specimen or pavement core, including air voids Gmm - ANSWERSTheoretical maximum specific gravity or "RICE" specific gravity of Asphalt-coated aggregated or "specific gravity of mix at zero air voids" Water batch temperature must be at 77 (plus or minus)2 degrees Mechanical Foaming - ANSWERSTemperature can't be less than 260 degrees Pub 351 - ANSWERSAsphalt Tech Certification Program PG-58S-28 PG-64S-22 PG-64E-22 - ANSWERS215-310 Degrees (COLD) 220-320 Degrees (Non-Heavy) 240-330 Degrees (Heavy) Rutting - ANSWERSReduced with the proper BINDER grade and Asphalt content. May have been caused by allowing traffic on a map that was too hot. Need for a scratch course, leveling, or milling Scratch Course: used to fill wheel ruts & other local small depressions Leveling Course: used to provide a relatively uniform level platform for placing binder or wearing course. Module 4 page 42 ESAL - ANSWERSCalculations are NOT linear and cars DO NOT count. 18,000 lbs Mix Designs (Base Course, - ANSWERSDo not place when surface is wet or temperature is 35 Degrees or below. Full Depth Reclamation (FDR) - ANSWERSExisting roadway materials Stabilized additives Imported aggregate or RAP TR-447 - ANSWERSSampling Sampling - ANSWERSNO sampling needed for quantities less than 500 Paving Seasons - ANSWERSExtended paving season is from April 1 to November 15 Paving season is from April 1 to October 31 Density Cores - ANSWERSTested using PTM 715 and PTM 716 Cores are to be taken within 1 DAY (24hrs) of placement Joints - ANSWERSOffset joints by 6 inches Overband all joints with Binder-(4+-1) 9.5mm Wearing Course - ANSWERSMinimum depth is 1 inch 6.3mm placement must be greater than 50 degrees outside and surface Stone Matrix Asphalt - ANSWERSPG-64E-22- 240 to 330 Degrees Prohibited when weather is ≤50 degrees or wet surfaces 93%-98% for 100% payment NO TACK between layers -9.5 or -19mm mixes 50 degrees Allows infiltration Do not over compact Cool to 100 degrees between each layer 4 passes with static drum TACK - ANSWERS90-150 Degrees NTT/CNTT - ANSWERS140-180 Degrees Micro Surfacing - ANSWERSRut Filler- Ruts up to 2 INCH TYPE A- 1/2 inches TYPE B- 1/2 to 1 1/4 inches PURPOSE: -Improve surface friction -Fill rods/minor surface irregularities -Seal pavement surface DESIGNED to be open to traffic within 1 hour of placement. Temperature minimum of 50 Degrees Apply from September 16 to April 30 DO NOT apply from October 1 to April 30 Module 4 page 54