HMA PLACEMENT
NCAT 2 To Be Covered Hauling Placement Compaction
NCAT 3 Tandem Axle End Dump Truck
NCAT 4 High Dump Semi-truck
NCAT 5 Belly Dump
NCAT 6 Multi-WHEELED Conveyor Feed
NCAT 7 Self Propelled Paver
NCAT 8 Self Propelled Paving Machine THE BASIC PRINCIPLE HAS NOT CHANGED MUCH
NCAT 9 Self Propelled Paving Machine HMA Flow
NCAT 10 Screed Unit
NCAT 11 Forces On Screed
NCAT 12 ONE OF THE ESSENTIALS FOR A CONSISTENT AND HIGH QUALITY HOT MIX ASPHALT PAVEMENT IS TO PROVIDE FOR A CONTINUOUS OPERATION
NCAT 13
NCAT 14 Material Transfer Device
NCAT 15 COMPACTION GOOD COMPACTION LEADS TO GOOD PERFORMANCE
NCAT 16 Reason For Compaction To prevent further compactionTo prevent further compaction To provide shear strength or resistance to ruttingTo provide shear strength or resistance to rutting To ensure the mixture is waterproofTo ensure the mixture is waterproof To prevent excessive oxidation of the asphalt binderTo prevent excessive oxidation of the asphalt binder
NCAT 17 Durability vs Air Voids % Air Voids Stability Cohesion Zone of Highest Durability 0 FlushingRaveling
NCAT 18 Factors Affecting Compaction Mix PropertiesMix Properties –Aggregate –Asphalt –Mix Temperature Layer ThicknessLayer Thickness Environmental FactorsEnvironmental Factors RollersRollers
NCAT 19 Temperature is critical
NCAT 20 Rollers VibratoryVibratory Pneumatic-tiredPneumatic-tired Steel wheeled tandem rollersSteel wheeled tandem rollers
NCAT 21 Vibratory Roller
NCAT 22 Pnuematic Roller
NCAT 23 Steel Wheeled Roller
NCAT 24 Checking Density With Nuclear Gauge
NCAT 25 Extracting A Core
NCAT 26 Questions - ?