210-1 Description.
Rework (or rework and widen) the existing rock base, by adding new limerock material as required by the Plans. Construct adjacent turnouts, entirely with new limerock.
210-2 Materials.
Meet the limerock material requirements as specified in Section 911 if new limerock is needed. The Contractor may use limerock of either Miami Oolite or Ocala Formation but only use limerock of one formation on any Contract.
210-3 Equipment.
Provide equipment meeting the requirements of 200 -3.
210-4 Existing B ituminous Surfaces.
210-4.1 Asphalt Concrete: Remove asphalt concrete surfaces from the base prior to
excavating trenches or scarifying the rock. Dispose of removed materials as specified in 120 -5.
210-4.2 Bituminous Surface Treatment: Remove and dispose of existing bituminous
surface treatment only when specifically specified in the Plans. Otherwise, the Contractor may mix the existing bituminous surfacing in with the existing limerock material.
210-5 Trenches and Subgrade.
Where widening the existing b ase, excavate trenches along the edges of the existing pavement to the width and depth indicated in the Plans. Excavate the trenches before scarifying the existing base. Shape, compact, and maintain the subgrade of the trenches and turnouts as specified in 120-9, except that when stabilization of the subgrade is not included in the Plans, do not compact the trenches unless the native underlying material has been disturbed. Dispose of all excavated materials as specified in 120 -5.
210-6 Spreading, Shaping, a nd Compacting Rock.
210-6.1 General: Scarify and disk, or otherwise loosen the existing base to such extent
that no pieces larger than 3 1/2 inches in greatest dimension remain bonded together. Then, spread the material to the full width of the proposed n ew base course and to a grade and cross - section roughly parallel to the finished grade. Meet the requirements of 200 -7.1.
210-6.2 Widening Strips: Where the widening strips are not of sufficient width to permit
the use of standard compaction equipment, co mpact the rock in accordance with 200 -6.5.
210-6.3 Construction Sequence: Do not spread any material for the upper course until
the Engineer has made the density tests on the lower course and has determined that the specified compaction requirements have been met. Then, construct the second course of new limerock in accordance with the requirements of 200 -5 through 200 -7.
210-7 Priming and Maintaining.
Meet the requirements of 200 -8. FY 2023-24 Return to Table of Contents
210-8 Method of Measurement.
210-8.1 Base: The quantity to be paid for will be the plan quantity, in square yards,
completed and accepted, including the areas of widened base and of turnouts constructed of new limerock material.
210-8.2 Limerock Material: The quantity to be paid for will be the number of cubic
yards of only the new limerock material actually placed in the road and accepted. The quantity will be determined by measurement in loose volume, in truck bodies, at the point of dumping on the road, with proper deduction for all materials wasted, left in trucks or othe rwise not actually used in the road. For this purpose, level the material in the truck bodies to facilitate accurate measurement.
210-9 Basis of Payment.
Prices and payments will be full compensation for performing all work specified in this Section inclu ding prime coat application as specified in 300 -7, except all earthwork required for this work, and the work of removal and disposal of the existing bituminous surfaces, if required, as indicated in the Plans. When the plans do not provide for direct paym ent for such work, the cost will be included in the Contract unit price for reworking limerock base. Payment will be made under: Item No. 210 - 1- Reworking Limerock Base - per square yard. Item No. 210 - 2- Limerock, New Material - per cubic yard. FY 2023-24 Return to Table of Contents SECTION 230 LIMEROCK STABILIZED BASE
230-1 Description.
Construct a base course composed of roadbed soil stabilized with limerock.
230-2 Materials.
Meet the limerock material requirements as specified in Section 911.
230-3 Equipment.
230-3.1 For Mixing: For mixing in the roadway, provide a heavy -duty rotary tiller or
other equipment approved by the Engineer as equally effective for this work.
230-3.2 For Compaction: Select the equipment for compacting the stabilized material,
except that for the final finish use a steel -wheeled roller.
230-4 Preparation of Roadbed.
Complete the area to be stabilized to the lines shown in the Plans and to a grade parallel to the finished elevation of the stabilized base, before adding the stabilizing material. Ens ure that the elevation of the roadbed is such that the base will conform to the typical section upon completing the work. Dispose of any surplus excavated materials resulting from this work, as specified in 120 -5.
230-5 Incorporation of Stabilizing Materia l and Mixing -In.
230-5.1 Spreading and Mixing: Place the limerock on the areas to be stabilized, and
spread it uniformly to the loose depth shown in the Plans or ordered by the Engineer. Then, thoroughly mix the limerock with the soil. Perform mixing as s oon as practicable but not later than one week after placing the limerock on the road. Do not spread more limerock in advance of the mixing operations than can be mixed -in with the soil within one week.
230-5.2 Further Mixing Operations: Repeat the mixing operations as often as may be
necessary to distribute the limerock uniformly throughout the soil, as determined by the Engineer. Further manipulate the material to uniformly distribute the limerock throughout the width and depth of the base course.
230-5.3 Plant Mixing: The Contractor may mix the soil, limerock, and water using the
central plant -mix method in lieu of mixing in place, provided he obtains a uniform mixture with the proper amount of water.
230-5.4 Shaping Surface: After mixing, shape the su rface so it conforms to the grade
and typical section shown in the Plans after compacting.
230-5.5 Depth of Mixing Stabilizing Material: Ensure that the depth of mixing of the
stabilizing material is in accordance with Table 230-1 below: FY 2023-24 Return to Table of Contents