Mobile Asphalt Mixture Testing Laboratory (MAMTL) Trailer

Mobile Asphalt Mixture Testing Laboratory (MAMTL) Trailer

Office of Pavement Technology
Asphalt Pavement Program
Mobile Asphalt Mixture Testing
Laboratory (MAMTL) Trailer
2008 LTAP/TTAP Conference
Breckenridge, CO
July 14 – 17, 2008
Long-Life Asphalt Pavement for the 21st Century
MAMTL Trailer
Mobile Asphalt Lab Technology
z
z
Equipment Development & Refinement
z
Asphalt Mixture Performance Test (AMPT)
z
Aggregate Imaging System (AIMS)
Evaluation and Performance of New Asphalt
Pavement Materials
z
Asphalt Modifiers, Warm Mix Asphalt (WMA)
z
Development of New QA Concepts for HMA
z
Advanced Rapid Test Tools
z
AIMS, SSDetect, CoreLok, CoreDry, Angle Validation
Routine Project Site Activities
z Material
z Mix
Characterization
Design Replication and Testing
z Production
Testing
Material Characterization
Aggregate Stockpile
Gradation
Asphalt Binder
Specific Gravity
Specific Gravities
T 84 & T 85, CoreLok, SSDetect
Consensus Properties
Aggregate Imaging
(AIMS)
Grading
M320
Preliminary Testing
Mix Design Replication
3 Points
Performance Test Specimens
• 4 Replicates per Pb
Ignition Furnace
Correction Factor
Production Testing
HMA Sample
• Performance Specimens
•Gradation • Pb
•
T 30
•
• 4 - Replicates
Ignition
•VMA
•Va
• T 166
•VFA
• CoreLok •P
0.075 / Pbe
• Gmm
• Gmb
• Dynamic Modulus (E*)
• Unconfined/Confined
• Flow Number (Fn)
• Unconfined/Confined
Asphalt Mixture Performance
Test (AMPT)
z
Dynamic Modulus (E*)
Direct input into AASHTO Mechanistic
Empirical Pavement Design Guide
(MEPDG) Software
z Addresses Pavement Rutting & Cracking
z
z
Flow Number (Fn)
z
z
May Be Best Simulation
of Actual Load
Static Creep (Flow Time)
Performance Characteristics
z
Asphalt Mixture Performance Test (AMPT)
IPC Global
Specimen Fabrication
z
SGC Specimen
150mm diameter
z 165 ~ 190mm height
z
z
Final Test Specimen
100mm (4 in.) diameter
z 150mm (6 in.) height
z
Smooth Parallel Ends
z Maximum Aggregate Size
z
z
37.5mm (1.5 in.)
IPC ServoPac
Performance Sample Preparation
NCHRP Recommended
Temperatures and Frequencies
Temperature
Frequency (Hz)
Traffic Speed
SLOW
°C
°F
.1
-10
14
.5
4.4
40
1
21.1
70
5
37.8
100
10
54.4
130
25
FAST
Master Curve Development
1.0E+07
1.0E+06
12 F
40 F
70 F
100 F
130 F
1.0E+05
1.0E+04
1.E-07
1.E-05
1.E-03
1.E-01
TIME
1.E+01
1.E+03
1.E+05
Master Curve Development
1.0E+07
DYNAMIC MODULUS
1.0E+06
12 F
40 F
70 F
100 F
130 F
1.0E+05
1.0E+04
1.E-07
1.E-05
1.E-03
1.E-01
TIME
1.E+01
1.E+03
1.E+05
Advanced Rapid Test Tools
Aggregate Imaging
System (AIMS)
z
z
Distributed by Pine
Instrument Company
Consensus Property Tests
z
z
z
z
Coarse Aggregate Angularity
(fractured faces)
Flat & Elongated Particles
Fine Aggregate Angularity (voids in
fine aggs)
Form, Angularity, and Texture
Aggregate Imaging System
Form
Angularity
Texture
Angularity – Coarse Aggregate
Angular
> 6000
SubAngular
SubRounded
4000 - 6000 3000 - 4000
Rounded
< 3000
Development of 2nd Generation
AIMS Device
Advanced Rapid Test Tools
CoreLok
z Marketed
by Instrotek Inc.
z Versatile device
z Gmm
z Gmb
z Gsb
– Coarse & Fine Agg.
z Vacuum
Sealing Procedure
Advanced Rapid Test Tools
CoreDry
z Marketed
by InstroTek Inc.
z Rapid Vacuum Drying
z Alternating
cycles of
Vacuum and Heating
z Maintains
Sample at
Room Temperature
Advanced Rapid Test Tools
SSDetect
z Distributed
by
Barnstead/Thermolyne
z Fine Aggregate
z Dry
– Wet Conditioning
z Infrared Conditioning
Additional HMA Technology
ServoPac - Superpave Gyratory
Compactor (SGC)
z Capable
of measuring Shear
Resistance
z Compacts tall specimens required
for fabrication of performance test
specimens
IPC ServoPac
Additional HMA Technology
z
Internal Angle Measurement with
the Dynamic Angle Validator (DAV)
Superpave Gyratory Compactor
(SGC) - Internal Angle
z
Factors Influencing Angle of Gyration
SGC Frame Compliance
z SGC Maintenance
z SGC Mold Wear
z Mixture Stiffness
z
Internal Angle Measurement
DAV on Top
to measure αT
DAV on Bottom
to measure αB
Mixless SGC Internal Angle
z
Hot Mix Simulator (HMS) - TestQuip
MAMTL Trailer