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HMA PLACEMENT

HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

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Page 1: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

HMA PLACEMENT

Page 2: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 2

To Be Covered

• Hauling

• Placement

• Compaction

Page 3: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 3

Tandem Axle End Dump Truck

Page 4: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 4

High Dump Semi-truck

Page 5: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 5

Belly Dump

Page 6: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 6

Multi-WHEELEDConveyor Feed

Page 7: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 7

Self Propelled Paver

Page 8: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 8

Self Propelled Paving Machine

THE BASIC PRINCIPLE HAS NOT CHANGED

MUCH

Page 9: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 9

Self Propelled Paving Machine

HMA Flow

Page 10: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 10

Screed Unit

Page 11: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 11

Forces On Screed

Page 12: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 12

ONE OF THE ONE OF THE ESSENTIALS ESSENTIALS

FOR A FOR A CONSISTENT CONSISTENT

AND HIGH AND HIGH QUALITY HOT QUALITY HOT MIX ASPHALT MIX ASPHALT

PAVEMENT IS TO PAVEMENT IS TO PROVIDE FOR A PROVIDE FOR A

CONTINUOUS CONTINUOUS OPERATIONOPERATION

Page 13: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 13

Page 14: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 14

Material Transfer Device

Page 15: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 15

COMPACTION

GOOD COMPACTION

LEADS TO GOOD PERFORMANCE

Page 16: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 16

Reason For CompactionReason For Compaction

• To prevent further compactionTo prevent further compaction

• To provide shear strength or resistance To provide shear strength or resistance

to ruttingto rutting

• To ensure the mixture is waterproofTo ensure the mixture is waterproof

• To prevent excessive oxidation of the To prevent excessive oxidation of the

asphalt binderasphalt binder

Page 17: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 17

Durability vs Air Voids

% Air Voids

StabilityCohesion

Zone of Highest

Durability

0

Flushing Raveling

Page 18: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 18

Factors Affecting CompactionFactors Affecting Compaction

• Mix PropertiesMix Properties– AggregateAggregate– Asphalt Asphalt – Mix TemperatureMix Temperature

• Layer ThicknessLayer Thickness

• Environmental FactorsEnvironmental Factors

• RollersRollers

Page 19: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 19

Temperature is critical

Page 20: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 20

RollersRollers• VibratoryVibratory

• Pneumatic-tiredPneumatic-tired

• Steel wheeled tandem rollersSteel wheeled tandem rollers

Page 21: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 21

Vibratory Roller

Page 22: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 22

Pnuematic Roller

Page 23: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 23

Steel Wheeled Roller

Page 24: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 24

Checking Density With Nuclear Gauge

Page 25: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 25

Extracting A Core

Page 26: HMA PLACEMENT. NCAT 2 To Be Covered Hauling Placement Compaction

NCAT 26

Questions - ?