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a. BOMAG Asphalt Manager IC Roller b. AMMANN IC Roller
c. Caterpillar IC Roller d. Vibratory Roller Instrumented by TTI for Use
on Research Projects
Figure 16. Fully equipped rollers measuring the stiffness of the material being
compacted.
into account more than the Asphalt Manager does in an auto- formity of the mat, and results in accurate, consistent readings.
mated fashion. The computer in the ACE system is capable of For impact on the contractor's progress, assuming that the
receiving information such as lift thickness, number of passes, roller-mounted devices do what is claimed, they can help
mix or soil type, which is used in the calculation of the mate- the contractor's progress and provide information so that the
rial's stiffness or modulus. Just as with the Asphalt Manager, contractor can make better decisions in real-time regarding
the system is fully integrated into a vibratory roller that is part compaction of pavement layers.
of an operational paving train.
1.8 Summary of Process Impact
1.7.3 Summary
Table 13 provides a summary of process impact on flexible
The true test of this "intelligent compaction" system is pavement construction for different NDT technologies and
whether it actually saves time (fewer passes), improves uni- devices regarding their use in QA programs.
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Table 13. Process impact of different NDT technologies and devices on QA programs.
NDT Technologies
Impact Deflection-Based DCP Non-Nuclear Devices
Steady-
Topics or Ultrasonic Non-
State GPR Roller-
Issues Gauges Trailer Portable Manual Automated Roller-
Vibratory Mounted
Mounted
Easily used
to develop HMA-
density or No Yes No Yes No No No Yes Yes
modulus Unbound-
growth Yes
curves?
Deflection Penetration Penetration Density Stiffness
Resulting Seismic Elastic Dielectric
Deflection & Elastic Rate or Rate or & Water or
Value Modulus Modulus Values
Modulus Index Index Content Density
Conversion
required to
Yes No No No No No Yes No No
adjust
readings?
Requires
calibration
to specific Yes Yes Yes Yes Yes Yes Yes Yes No
materials or
soils?
Can readily
test thin
Yes No No No Yes Yes Yes Yes Yes
layers (<3
in.)
Can readily
test thick
Yes No Yes Yes Yes Yes Yes No No
layers (>12
in.)
Readily
applicable Yes Yes No Yes Yes Yes No Yes Yes
to control?
Readily
applicable No, only
Yes Yes final Yes Yes Yes Yes Yes No
to
acceptance? structure
Additional
auxiliary Yes, tow Yes,
No No No No Yes No No
equipment vehicle vehicle
needed?
Additional
staff No No Yes, No No No No
Yes Yes
needed? operator
Equipment
readily
available on Yes Yes Yes Yes Yes Yes Yes Yes Yes
commercial
basis?
Software
readily
available on Yes NA Yes Yes NA NA No; for NA NA
commercial Proprietary
basis?
