block 20 types of rollers 13
DESCRIPTION
TRANSCRIPT
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Construction Compaction Equipment 1
HMA Compaction
Types of Rollers & the Compaction Process
Senior/GraduateHMA Course
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Construction Compaction Equipment 2
What you will learn….
• The different types of compactors• How compactors compact• Variables associated with compaction• How density is controlled in the field
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Construction Compaction Equipment 3
Types of Rollers
• Static Steel Wheel • Pneumatic – Rubber Tired• Vibratory
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Construction Compaction Equipment 4
How Do Rollers Compact?
By applying their load
over a given area!
(Contact Pressure)
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Construction Compaction Equipment 5
Static Steel Wheel Roller
• Contact Pressure • Operation
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Construction Compaction Equipment 6
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Construction Compaction Equipment 7
Pounds per Linear Inch (PLI)
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Construction Compaction Equipment 8
Pounds Per Linear Inch (PLI)
• Example:– A 8 ton roller with two, 50 inch wide drums.– In this case, 60% of the mass is on the
drive drum and 40% is on the guide drum.– Calculate the PLI for each roll and for the
roller in total.
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Construction Compaction Equipment 9
Pounds Per Linear Inch (PLI)
• 8 tons x 2000 lbs/ton = 16,000 lbs.• For each drum
60% x 16,000 lbs. / 50 inches = 192 PLI
40% x 16,000 lbs. / 50 inches = 128 PLI • For total roller
16,000 lbs. / (50 +50) = 160 PLI
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Construction Compaction Equipment 10
Speed of Roller
• Speed kills compaction forces• Dwell time• Pressure, impact, manipulation
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Construction Compaction Equipment 11
Travel
Frictional force turns trailing drum
Non-Non-powered powered
drumdrumPowered
Drum
WW R
R
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Construction Compaction Equipment 12
Pneumatic Tired Rollers
• Wheel load• Tire design • Inflation pressure• Contact area
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Construction Compaction Equipment 14
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Construction Compaction Equipment 15
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Construction Compaction Equipment 16
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Construction Compaction Equipment 17
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Construction Compaction Equipment 18
Vibratory Rollers
• Amplitude • Frequency• Impact Spacing • Operation
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Construction Compaction Equipment 19
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Construction Compaction Equipment 20
01-00 6 - 47
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Construction Compaction Equipment 21
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Construction Compaction Equipment 22
Frequency, f = the number of hertz (cycles/s)--a single cycle is one full rotation of the eccentric weight. Frequency = 1/T
Amplitude, A = the maximum deviation from position at rest -- one-half the total movement.
Amplitude(A)
Time
U pD
ow
n
Time (T) For Full Cycle
Mo
vem
ent
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Construction Compaction Equipment 23
AMPLITUDE
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Construction Compaction Equipment 24
DIRECTION OF TRAVEL
FREQUENCY
Impact Spacing
High FrequencyLow Frequency
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Construction Compaction Equipment 25
Typical Compaction Process
Compactive Force PressureVibration
PressureManipulation
Pressure
TemperatureZones
300° - 240°F 240° - 190°F 170 - 150°F
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Construction Compaction Equipment 26
Compaction Variables
• Roller Speed • Number of Coverages• Rolling Zone • Rolling Pattern
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Construction Compaction Equipment 27
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Construction Compaction Equipment 28
Typical Range of Roller Speeds(miles per hour)
Type of Roller Breakdown Intermediate Finish
Static Steel Wheel 2 to 3.5 2.5 to 4 3 to 5
Pneumatic 2 to 3.5 2.5 to 4 4 to 7
Vibratory 2 to 3.5 2.5 to 3.5 3 to 51
1 1 Operated in static modeOperated in static mode
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Construction Compaction Equipment 29
One Coverage
How many passes of the roller are How many passes of the roller are needed to cover the width of the mat needed to cover the width of the mat one time ?one time ?
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Construction Compaction Equipment 30
Pass & Coverage DefinedW
idth
of m
at Pass1
Pass 2Make up Pass 5
Pass 3
Pass 4
This is a 5 pass pattern that provides 2 complete coverages.
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Construction Compaction Equipment 31
75 m
15 m
Typical Rolling Zone
Paver
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Construction Compaction Equipment 32
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Construction Compaction Equipment 33
Test Strip Construction
• Simulating Actual Conditions • Establishing Roller Patterns • Calculating Effective Roller Speed
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Construction Compaction Equipment 34
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Construction Compaction Equipment 35
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Construction Compaction Equipment 36
1
4
2
3
5
6
CROWN2-lanes
One Roller Coverage
Drum Width = 72 inches
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Construction Compaction Equipment 37
How Many Repeat Coverages to Assure Density?
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Construction Compaction Equipment 38
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Construction Compaction Equipment 39
Density
High
Low
DensityPassing
1 2 43 5 6
Roller Passes
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Construction Compaction Equipment 40
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Construction Compaction Equipment 41
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Construction Compaction Equipment 42
Balancing Production
Trucking Compaction
PavingHMA Facility
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Construction Compaction Equipment 43
Questions?