Approval may be sought for coarse aggregate not specifically
mentioned by name in the Department's Standard Specifications for Road
and Bridge Construction use in open-graded Friction Course Asphalt
Mix, Type 5 (FC-5). The following approval requirements are in addition to the
requirements of Rule 14-103.004, F.A.C., for such
alternate materials having characteristics which will result in a friction
course providing acceptable long-term frictional characteristics. Once
approved, coarse aggregate may be submitted in all Department friction course
mixes subject to specification requirements.
(1) A detailed description of the location
within the overall mining site of the specific deposit proposed for use in an
FC-5, and a description of the unique characteristics of this deposit which can
be used to differentiate it from other material occurring at the site. These
characteristics will include such things as color, texture, hardness, physical
or chemical properties, and other properties determined in accordance with the
Sampling and Testing Methods or in accordance with paragraph
14-103.006(14)(c),
F.A.C.
(2) An estimate of the
quantity of material available.
(3)
A determination of the acid insoluble material retained on the No. 200 mesh
sieve (FM 5-510) must be submitted on at least five samples.
(4) Submission of any test data which the
producer considers significant to potential friction characteristics, such as
wear tests, hardness, crushed faces, angularity, and other relevant
characteristics.
(5) The
construction of a trial section of FC-5 pavement from the material will be
required by the State Materials Office based on history of use and performance.
The construction of the FC-5 trial section will be the sole responsibility of
the producer. The State Materials Office will design the mix, monitor
construction, obtain samples for evaluation, and test the friction
characteristics of the surface. The trial section will be a minimum of 500 feet
in length to accommodate friction testing, and shall be constructed on a
roadway not maintained by the Department. No minimum traffic volume will be
required for approval of trial sections.
(6) The information supplied by the producer,
the inspection of the mine, and any test results from a trial section will be
reviewed by the State Materials Office. If the material indicates a potential
for use in an FC-5, the producer will be notified and a test section will then
be selected by the producer for Department evaluation of the wear
characteristics of the material. The State Materials Office will assist the
producer in the selection of a test section which meets the following criteria:
(a) Minimum 50 miles per hour speed
limit.
(b) Minimum 14,000 Average
Daily Traffic.
(c) No intersection,
ramps, driveways or curves.
(d)
Minimum of four lanes.
(e) Minimum
length of 1,000 feet.
A control section meeting the test section criteria and
adjoining the test section will be constructed with a Department approved
aggregate.
(7)
Following the selection of a suitable test section, the producer will then
provide sufficient material and make the necessary arrangements with the paving
contractor for construction of the FC-5 test section and FC-5 control section.
Any additional costs incurred by the paving contractor for the test section and
control section will be the responsibility of the producer. The State Materials
Office will design the mixes, monitor construction and obtain samples for
evaluation. Friction tests will be conducted by the State Materials Office on
the test section immediately after construction, then monthly for two months
and thereafter at intervals of two months until the accumulated traffic reaches
six million (vehicles) coverage or the friction number stabilizes. Friction
tests will be conducted at 40 mph in accordance with ASTM E274-97, effective
1997, which is incorporated herein by reference, using both E501 (Rib) and the
E524 (Blank) test tires. In the event that the friction number falls below 30
or the test section is otherwise determined to be a threat to public safety
within the first two years of construction completion, the evaluation will be
terminated and the producer will bear the cost of removing the FC-5 and
resurfacing the test section with an approved material. Prior to the
construction of the test section, the producer must provide a signed and
notarized statement agreeing to this responsibility. Pursuant to Section
837.06, F.S., the producer is
subject to a charge of perjury if a written false statement is made to a public
official.
(8) At the conclusion of
the evaluation period the friction number in the test section will be compared
to friction numbers obtained in the control section and with friction numbers
obtained using previously approved FC-5 aggregates. If the test section is
equivalent or better, the State Materials Office will grant approval of the
proposed aggregate contingent upon:
(a) The
aggregate consistently maintaining the unique characteristics established in
subsection
14-103.005(4),
F.A.C., that identify the specific deposit; and,
(b) The friction course utilizing the
aggregate consistently producing friction numbers and other performance
characteristics (smoothness and texture) that the Department considers
equivalent to the test section on a job by job
basis.
