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Project Goal
California is continually looking for new technologies
to help them construct higher quality and longer lasting
roads. Resperion and Caltrans have been working together
for numerous years in an attempt to refine the technical
guidance and specifications written for higher strength
asphalt concrete base in order to allow its routine
use cost effectively on California State Highway projects.
Location
of Project
State Route 138 is an east-west highway generally
following the northern foothills of the San Gabriel
Mountains of southern California, USA from its junction
with Interstate 5 south of Goman eastward to Mount
Anderson Junction, its eastern junction with State
Route 18 south of Crestline in the San Bernardino
Mountains. Except for the western two miles of the
route between Interstate 5 and just east of Gorman
Post Road and a segment shared with State Route 14
between Avenue D in Lancaster and Palmdale Boulevard
in Palmdale, it is all surface road, mostly undivided
two-lane road.
Project Details
 Phase
1: December 2006 Phase 2: April 2007
½
Mile in length
80
Feet wide
2
different modified basecourse depths: 240mm &
160mm
Wearcourse:
60mm Type A mix
Total
modified mix: 11,000 Tons
Objectives of Pilot
Program
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Evaluate the bidibility,
buildibility, constructibility, and performance
of the material specified by the specification; |
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Evaluate the applicability
of current mix design procedures, and QC/QA specifications; |
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Ensure that during production
the resilient modulus of the hot mix asphalt base
achieves the levels specified in the specification; |
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Confirm that aging of the
modified asphalt binder can be controlled during
the construction process; |
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Evaluate in-service aging,
and hardening to determine that these will not
cause premature cracking of the pavement; |
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Obtain unit cost information
for project estimating purposes; |
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Obtain material samples and
collect material information that will allow the
Gravel Equivalent Factor to be determined for
the base material specified by this specification;
and, |
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Collect additional project
information, and material data that assists the
analysis to be performed under the long-term objective.
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Determine effective pavement
strategies that can control the in-service aging,
and hardening of the modified asphalt binder; |
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Characterize the material
properties so that principles of engineering mechanics
can be used to analyze thickness design |
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Determine whether or not the
modified hot mix asphalt base can be represented
by equations typically used to describe the fatigue
behavior of hot mix asphalt bases containing neat
asphalt binders; and, |
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Understand the distress mechanism
so that distress/transfer functions can be developed
for low temperature cracking (if used under thin
surface courses), repeated load fatigue, and permanent
deformation. |
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