Asphalt Pavement Compaction: What Can We Learn from the Particle Rotation? · 2020. 10. 29. ·...
Transcript of Asphalt Pavement Compaction: What Can We Learn from the Particle Rotation? · 2020. 10. 29. ·...
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Asphalt Pavement Compaction: What Can We Learn from the Particle Rotation?
Shihui ShenPenn State Altoona
October 28, 2019
1
Transportation Asset and Infrastructure Management Conference
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Background2
Pavement compaction
Air void content
Air voidsize
Air void distribution
Smoothness Uniformity
Pavement performance and durability(resistance to cracking, rutting, and moisture damage)
• Compaction is one of the most critical steps in asphalt pavement construction that ultimately impacts pavement performance.
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Background3
Pavement compaction
• Experience-based field compaction that leads to over/under compaction
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Background4
Pavement compaction
Complex vehicle-surface interactions
• Intelligent Compaction—— Good improvement, accurate density control is still questionable
Hypothesis: particle movement, especially rotation, plays a significant role in the densification process of a particulate structure --- meso scale behavior
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Objectives
• Understand asphalt pavement compaction mechanism from the
perspective of particle movement especially rotation
Correlate particle movement to different compaction methods;
Provide preliminary insight into the compaction mechanism;
and
Explore the correlation between the SGC and field compaction
at meso-scale.
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Methodologies
• Using embedded sensors (SmartRock sensor) to capture the compaction (skeleton formation) characteristics of asphalt mixture in both field and lab
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SmartRock Sensors
Methodologies7
Outside
3D – printedCan be defined to be similar to real stones
MaterialHigh-temperature resistant (140-170℃)High strengthGood compatibility and cohesion with asphalt
Reduced sizeLess than 1 inch each side
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SmartRock Sensors
Methodologies8
Inside
Tri-axial gyroscope Tri-axial accelerometer Tri-axial magnetometer Temperature sensor Three directional stress cells
Long-life battery
6 months ~ 1 year
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SmartRock Sensors
Methodologies9
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SmartRock Sensors
Methodologies10
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• SmartRock in Superpave gyratory compactor
Compaction characteristics in the lab11
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Compaction characteristics in the lab
Particle follows a cyclic rotation pattern that repeats every 2 seconds that matches the SGC rotation speed of 30 rpm.
• Rotation plays a significant role for particle movement in a confined particulate structure.
A segment of rotation data output
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Relative RotationThe difference between the peak and the valley values of the rotation angle for each cycle.
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Compaction characteristics in the lab13
0 10 20 30 40 50 600
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Perc
ent
Gyration Cycle
%Gmb %Relative rotation angle change_x %Relative rotation angle change_y
0 10 20 30 40 50 60 700
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Perc
ent
Gyration Cycle
%Gmb %Relative rotation angle change_x %Relative rotation angle change_y
0 20 40 60 80 100 120 1400.0
0.5
1.0
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Rel
ativ
e R
otat
ion(
°)
Gyration Cycle
x-direction y-direction z-direction—— Specimen Height
0
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ght(m
m)
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ent
Gyration Cycle
%Gmb %Relative rotation angle change_x %Relative rotation angle change_y
%𝐺 ,𝐺𝑖
𝐺ℎ
ℎ𝑖 100%
%Relative rotation, i𝑚𝑖𝑛𝑖𝑚𝑢𝑚 𝑟𝑒𝑙𝑎𝑡𝑖𝑣𝑒 𝑟𝑜𝑡𝑎𝑡𝑖𝑜𝑛𝑟𝑒𝑙𝑎𝑡𝑖𝑣𝑒 𝑟𝑜𝑡𝑎𝑡𝑖𝑜𝑛 𝑎𝑡 𝑐𝑦𝑐𝑙𝑒 𝑖
∗
*Wang X, Shen S, Huang H, et al. Characterization of particle movement in Superpave gyratory compactor at meso-scale using SmartRock sensors. Construction and Building Materials, 2018, 175: 206-214.
In SGC compaction, the relative rotation pattern of particles along x- and y- axis was directly related to material density change.
• Relationship between particle rotation and mixture density
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Compaction characteristics in the lab14
*Wang X, Shen S, Huang H, et al. Characterization of particle movement in Superpave gyratory compactor at meso-scale using SmartRock sensors[J]. Construction and Building Materials, 2018, 175: 206-214.
• Compaction as a three-stage process
0 20 40 60 80 100 1201.5
2.0
2.5
Relative RotationRate Reduction Cycle
InitialCompactionStage Plateau StageTrasition Stage
Rel
ativ
e R
otat
ion
(°)
Gyration Cycle
Relative RotationStabilization Cycle
Stage I:Initial compaction stage(Particles had large relative rotation and also a sharp reduction, due to much compaction and height reduction.)
Stage II:Transition stage(Particle movement was restricted as represented by the reduced relative rotation rate.)
Stage III:Plateau stage(Particle rotation was much restricted by the compacted structure, except following the regular rotation of SGC.)
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Compaction characteristics in the labAC relative rotation and specimen height change
• Generally, the relative rotation pattern of particles along x- and y- axis was directly related to material density change during the compaction process.
3 trials
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0 10 20 30 40 50 60 70 800.0
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cle
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otat
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Compaction characteristics in the lab
Other mixture types: Relative rotation and height
PFC
SMA
0 20 40 60 80 1000.0
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cle
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otat
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otat
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Compaction characteristics in LabEffect of gradation on particle rotation and compaction
0 10 20 30 40 50 60 70 800
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%Relative rotation %Gmb
Perc
ent
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AC SMA
PFC
0 5 10 15 20
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ing
perc
ent (
%)
Sieve size (mm)
GA SMA AC
Relative rotation change curve:Structural-skeleton-related- Dense structure: affected by both coarse and fine particles- Gap/open structure: affected by coarse-coarse
interaction
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SmartRock in field asphalt pavement compaction
Compaction characteristics in field
Pavement Maintenance Project
Lane-widening Project
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Particle rotation recorded by SmartRock in field asphalt layer compaction
Compaction characteristics in field19
0 500 1000 1500 2000 2500-8-6-4-202468
101214
Rot
atio
n an
gle
(°)
Time (s)
x-direction y-direction z-direction
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Particle acceleration recorded by SmartRock in field asphalt layer compaction
Compaction characteristics in field20
0 500 1000 1500 2000 2500-1.0
-0.8
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Acce
lera
tion(
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Time (s)
x-direction y-direction z-direction
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Compaction characteristics in field21
Particle’s reaction to different rollers in asphalt layer
Static rollerParticle translated in z-direction (vertically), however, only in 1~2 passes in the initial compaction stage when asphalt mixture was quite loose.
Pneumatic-tyred rollerParticle translated in x and y-directions, at the same time rotating in three directions.
Vibrating rollerParticle translated in z-direction (vertically) in the whole compaction process when vibrating roller was on.
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Compaction characteristics in field22
0 10 20 30 40-0.5
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/s2 )
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851s (Driving backward)
Driving backward
Particle x-direction acceleration to pneumatic-tyred roller
Particle movement characteristics in asphalt layer compaction
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Compaction characteristics in field23
Particle z-direction rotation to pneumatic-tyred roller
-5 0 5 10 15 20 25 30 35 40
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otat
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angl
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otat
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angl
e (°
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851s (Driving backward)
Driving backward
Particle movement characteristics in asphalt layer compaction
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24Compaction characteristics in field
Z-direction
X-direction
Y-direction
Four times of roller working forward and backward
Particle three-axial acceleration in base layer compaction (initial stage)
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Comparison of particle acceleration in base layer during the initial and late stage
Compaction characteristics in field25
Initial stage
Late stage
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Particle three-axial rotation in base layer compaction (initial stage)
Compaction characteristics in field26
Z-direction
X-direction
Y-direction
Time (s)
Rota
tion
(°)
![Page 27: Asphalt Pavement Compaction: What Can We Learn from the Particle Rotation? · 2020. 10. 29. · *Wang X, Shen S, Huang H, et al. Characterization of particle movement in Superpave](https://reader035.fdocuments.in/reader035/viewer/2022071420/6119ba414c1d6e64033c6bc9/html5/thumbnails/27.jpg)
• Comparison of particle rotation in base layer during the initial and late stage
Compaction characteristics in field27
Initial stage
Late stage
Rotation angle change
Almost no angle change
![Page 28: Asphalt Pavement Compaction: What Can We Learn from the Particle Rotation? · 2020. 10. 29. · *Wang X, Shen S, Huang H, et al. Characterization of particle movement in Superpave](https://reader035.fdocuments.in/reader035/viewer/2022071420/6119ba414c1d6e64033c6bc9/html5/thumbnails/28.jpg)
• Different particle acceleration mode in asphalt and base layer (initial stage)
Compaction characteristics in field28
Asphalt layer z-direction acceleration
Base layer z-direction acceleration
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• Different particle rotation mode in asphalt and base layer (initial period)
Compaction characteristics in field29
Asphalt layer Base layer
-5 0 5 10 15 20 25 30 35 40
-4
-2
0
2
4
z-R
otat
ion
angl
e (
)
Time (s)
480s
![Page 30: Asphalt Pavement Compaction: What Can We Learn from the Particle Rotation? · 2020. 10. 29. · *Wang X, Shen S, Huang H, et al. Characterization of particle movement in Superpave](https://reader035.fdocuments.in/reader035/viewer/2022071420/6119ba414c1d6e64033c6bc9/html5/thumbnails/30.jpg)
Comparison between Lab and Field Compaction30
-5 0 5 10 15 20 25 30 35 40-1.5
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otat
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ang
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Relationship between SGC and field compaction of asphalt mixture
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Summary The SmartRock is capable of recording real-time particle translation and
rotation in the field and lab asphalt mixture compaction. Compared with the traditional sensors, the SmartRock has advantages in
pavement research : (1) it is wireless; (2) durable; and (3) it does not alter the motions of surrounding particles when embedded in asphalt mixture.
Particle reacted differently to different rollers, and the reaction can be explained by roller’s working mechanism.
Particle reacted different in different types of materials during compaction. Particle rotation characteristics is closely related to material density
change during compaction, and is affected by mixture gradation and skeleton.
The SGC compaction method could well simulate the kneading process produced by pneumatic-tyred roller.
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Acknowledgements
Railroad Technology & Services (http://www.railtechs.com/) for technical support of SmartRock sensors and its application
Graduate and undergraduate students at Penn State University and visiting scholar from Tongji University in China for running experiments and data analysis
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Thank you!
Any questions?33