This work consists of
breaking up existing, rigid, concrete pavement using a rubblize and roll method
to provide a base material for the placement of new asphalt concrete pavement.
Filler material may be needed
to correct grade after the concrete pavement has been rubblized. The Contractor must furnish materials
conforming to Item 304
in order to fill depressions 1 inch (25 mm) or greater in depth.
The Contractor must use a
self-contained, self-propelled unit of either the resonant frequency type or
the multiple head breaker type for rubblizing the exposed concrete
pavement. There are specific equipment
requirements for each type of breaker.
The Contractor must provide documentation showing that the proposed
equipment meets those requirements.
Refer to C&MS
320.03 for specific details.
A vibratory roller is
required and must have a total weight of at least 10 tons. The Contractor must provide documentation for
the roller, if needed by the project, to verify total weight.
The Contractor must make a
full-depth saw cut to cut load transfer devices at existing joints on ramps or
on the mainline pavement where the rubblizing abuts concrete pavement or
approach slabs that are to remain in place permanently, or temporarily, for
maintenance of traffic.
The Contractor is required to
rubblize a test section before beginning full-scale operations. The Engineer will designate the test section
area. The Contractor will rubblize the
test section per the specification requirements. At the direction of the Engineer, the
Contractor will excavate a test pit to check the particle sizes of the
rubblized concrete throughout the depth of the slab. Based on the Engineer’s determination, the
rubblizing operation may proceed or additional test sections and test pits may
be required in order to obtain the required particle sizes.
The test pit can be refilled
using the excavated material and additional 304
aggregate to bring the final surface to the required grade. The test pit can be rolled at the completion
of the test section, or later, during full operation.
Excavate at least one test
pit, at the location designated by the Engineer, for each production day or
every 7,040 square yards (5,886 m2), whichever is greater. Throughout the rubblizing, the Engineer may
require additional test pits, as necessary.
The Contractor is required to
adjust the speed of the rubblizing operation in order to maintain the correct
particle sizes. If the Contractor does
not consistently obtain the specified particle sizes, the Engineer may require
another test section, test pit, or additional passes to ensure compliance. The correct particle size is of critical
importance to obtaining a suitable base material, details of the particle size
requirements can be found in 320.04.
Leave steel reinforcement in
place in the rubblized pavement.
Reinforcing steel may rise to the surface during the rubblizing or
rolling operations. However, cut off any exposed steel reinforcement to below
the surface and remove it from the site.
The rubblized pavement must
be compacted with two passes of the vibratory roller operated in the vibratory
mode at a speed not to exceed 6 feet (1.8 m) per second.
Depressions 1 inch (25 mm) or
more in depth, below the immediate surrounding surface that form as a result of
rubblizing, compaction, or steel reinforcement removal, must be filled with
filler aggregate conforming to Item 304
or other Department accepted well graded aggregate that will compact.
Excess filler material must
be leveled off so that it is level with the surrounding area. Compact filled depressions with the same
roller and compactive effort as previously described.
Traffic is not allowed on the
rubblized pavement before the initial asphalt concrete base and intermediate
courses are in place.
The Contractor must structure
operations so that no more than 48 hours elapse between rubblizing the pavement
and placing the initial asphalt concrete course. In the event of rain during the 48-hour
period, the Engineer may waive this time limitation to allow sufficient time
for the rubblized pavement to dry to the Engineer’s satisfaction.
If the Engineer waives the
time limitation, cease rubblizing the pavement until the Engineer allows paving
to resume.
The Engineer will measure
rubblize and roll by the number of square yards (square meters).
The Engineer will use the
actual width of the existing concrete pavement and will measure the length
along the centerline of each roadway or ramp.
The Engineer will measure the
filler aggregate by the number of cubic yards (cubic meters) furnished, placed,
and compacted.
1. Document that equipment being used meets the
specifications.
2. Document the location and particle size determination
for each test section.
3. Document where rubblizing is being performed
(station-to-station), particle sizes obtained, cutting of reinforcing steel,
addition of filler aggregate, roller speed and passes, and any other
observations or issues during the operation.
4. Measure the width of the actual existing pavement and
the length along the centerline of each roadway. Calculate square yards for
payment.
5. Measure the filler aggregate and calculate the number
of cubic yards placed and compacted.
6. Document using form CA-D-3A
or other approved forms.