HomeMy WebLinkAboutSection 02232 Limerock Base
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SECTION 02232 LIMEROCK BASE
PART 1 - GENERAL
1.01 SCOPE:
A. Summary of Work: The CONTRACTOR shall provide all labor equipment and
materials to rework the existing rock base and shall include the adding of new
limerock material as required by the plans or as specified herein.
1.02 APPLICABLE PUBLICATIONS: The following standard specifications shall apply to the
work of this section as indicated:
A. Florida Department of Transportation.
1. Standard Specifications for Road and Bridge Construction, latest edition,
(FDOT).
B. American Society of Testing Materials, (ASTM).
1. ASTM D1557-00, Standard Test Methods for Laboratory Compaction
Characteristics of Soil Using the Modified Effort (56,000 ft-lb/ft3 (2,700 kN-
m/m3)).
2. ASTM D 2922-01, Standard Test Methods for Density of Soil and Soil-
Aggregate in Place by the Nuclear Methods (Shallow Depth).
1.03 DEFINITIONS: (Not Used)
1.04 SUBMITTALS: (Not Used)
1.05 QUALIFICATIONS: (Not Used)
1.06 RESPONSIBILITIES: (Not Used)
1.07 CERTIFICATIONS AND TESTING:
A. TESTS: CONTRACTOR shall perform field density tests in accordance with ASTM
D 2922-01, Test for Density of Soil and Soil-Aggregate in Place by the Nuclear
Method, for every 300 LF of limerock installed. The areas to be tested shall be
determined by the ENGINEER. Laboratory compaction tests in accordance with
D1557-00 Standard Test Methods for Laboratory compaction Characteristics of Soil
Using the Modified Effort (56,000 ft-lbf/cu. ft.) will also be performed as required.
The CONTRACTOR shall make the site available for independent testing and
cooperate fully to allow tests to be taken. Failure to meet the specified density will
require the CONTRACTOR to recompact and retest those areas directed by the
ENGINEER.
1.08 INSPECTION COORDINATION: The CONTRACTOR shall provide access to the WORK
for the ENGINEER as requested for inspection. The Contractor shall provide 48 hours
notice of its intention to begin new WORK activities.
1.09 WARRANTY: (Not Used)
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PART 2 - PRODUCTS
2.01 LIMEROCK BASE: The CONTRACTOR shall provide new limerock conforming to FDOT
Standard Specifications for Road and Bridge Construction SECTION 911. The minimum
acceptable density of limerock shall be 120 lbs./cu. ft.
PART 3 - EXECUTION
3.01 BASE PREPARATION: The CONTRACTOR shall prepare the existing base by scarifying
and disking to a depth of not less than 6 inches for the full width of the proposed base.
The base shall be loosened to such an extent that no pieces larger than 3-1/2 inches in
the greatest dimension remain bonded together. All unsuitable base materials such as
organic matter, muck, roots, brush, or other material that will not compact into a suitable
and enduring roadbed shall be removed and disposed off-site.
3.02 REMOVAL OF ASPHALTIC SURFACES: The CONTRACTOR shall remove all asphaltic
concrete surfaces prior to scarifying of the existing rock base. All such materials shall be
disposed of off-site in areas provided by the CONTRACTOR, unless other disposal is
shown on the plans.
3.03 SPREADING AND SHAPING: The CONTRACTOR shall spread existing base materials to
the full width of the proposed new base course and to a grade and cross section roughly
parallel to the finished grade. Limerock shall be added as necessary to bring the
proposed base to the grades required on the Drawings.
3.04 COMPACTING AND FINISHING BASE: The CONTRACTOR shall compact by rolling with
either the grid-type roller or the sheep’s foot roller, properly weighted, after the spreading
and mixing operations are complete. The material being compacted shall be maintained
within plus or minus 2 percent of its optimum moisture content during compaction. Final
rolling shall be accomplished with traffic rollers. The base shall be compacted to not less
than 98 percent of the maximum density as determined by ASTM D1557-00, and in
accordance with FDOT Standard Specifications for Road and Bridge Construction Section
200.
3.05 PRIMING AND MAINTAINING: The CONTRACTOR shall apply prime coat only when the
base meets the specified density requirements and the moisture content in the top half of
the base does not exceed 90 percent of the optimum moisture of the base material. At the
time of priming, the base shall be firm, unyielding and in such condition that no undue
distortion will occur. The CONTRACTOR shall be responsible for assuring that the true
crown and template are maintained, with no rutting or other distortion, and that the base
meets all the requirements at the time the surface course is applied.
END OF SECTION