SECTION 406 — FULL DEPTH RECLAMATION WITH CALCIUM CHLORIDE 400-25 — FULL DEPTH RECLAMATION WITH CALCIUM CHLORIDE
406.01 Description.
This work includes the rehabilitation of an existing pavement structure into a processed asphalt stabilized base (recycled) course. The existing asphalt pavement will be pulverized and mixed with the existing gravel borrow subbase to the depth specified.
406.02 Materials.
Reclaimed Base. Ensure that the processed asphalt stabilized base material conforms to the following gradation: Sieve Designation % Passing by Weight 3 in. 95 – 100 No. 200 2 – 15 Ensure that the maximum dimension of any stone, rock, asphalt-bound material, or cobble is not more than 4 in. If additional material is required, add material from an external source that meets the gradation requirements. Ensure that the scarified pavement and the additional material are mixed, blended, and worked to meet the gradation requirements. The Contractor will be compensated for any additional material that is transported to the site. Liquid Calcium Chloride. Where designated, provide a manufacturer to supply the calcium chloride solution as a true solution, and do not reconstitute from flake calcium chloride. Ensure that the calcium meets AASHTO M 144 and the following: Calcium Chloride 35% ± 1% Alkali Chloride as NaCl 2% max. Magnesium as MgCl 0.1% max. Provide a certificate of compliance.
406.03 Construction Methods.
Equipment. Reclaimer. For reclamation, use a traveling rotary reclaimer or equivalent machine capable of cutting and milling through existing asphalt and gravel at depths up to 12 in. with one pass. Ensure that the equipment can effectively pulverize, crush, mix, and blend the recyclable material and additional material, if required, to form a homogeneous mixture of processed base material that will form a
Part 400 — Asphalt Pavements August 2025
400-26 SECTION 406 — FULL DEPTH RECLAMATION WITH CALCIUM CHLORIDE stable base when compacted. Use a self-propelled machine that is equipped with an adjustable grading blade that leaves its path generally smooth for traffic. Calcium Pressure Distributor. Spray the pulverized asphalt pavement and gravel with calcium chloride, processed, reshaped, rolled, compacted, and fine graded to the required cross sections and/or grades. Ensure that the distributor for calcium chloride can apply liquid calcium chloride in measured quantities at any rate between 0.1 to 2.0 gal/sq yd of roadway surface at any length of spray bar up to 20 ft. Ensure that the distributor can maintain a uniform rate of distribution of material regardless of the change in grade, width, or direction of the road. Equip the distributor with a digital volumetric accumulator meter capable of measuring gallons applied and distance traveled. Equip the volume and measuring device with a power unit for the pump so that the application is by pressure, not gravity. Ensure that the spray nozzles and pressure system provide a sufficient and uniform fan- shaped spray of material throughout the entire length of the spray bar at all times while operating, and ensure that the spray bar is adjustable lateral ly and vertically. Ensure that the spray covers the roadway surface receiving the treatment. Rollers. Use at least one vibratory sheepsfoot roller for initial compaction that has a compacting width of not less than 54 in. and a gross weight of not less than 12 tons. Provide a drum that has a minimum of 112 tamping feet. Accomplish the final rolling using a single drum vibratory roller. Procedure. Ensure that the pulverization and mixing blends the asphalt and gravel borrow subbase material into a homogeneous mixture. After the first pulverization, apply one application of calcium chloride solution at a rate of 0.75 gallon minimum per square yard to the reclaimed base. Re - pulverize and remix t he reclaimed base to ensure complete blending of pulverized asphalt material, underlying gravel, additional material if any, and calcium chloride throughout its depth. Ensure that the reclaimed base course is fine graded according to the required lines, grades, and typical cross sections. Compact the base course to a uniform density of not less than 95 percent of maximum density as determined by AASHTO T180, Method C. Test the finished reclaimed base course for smoothness and accuracy of grade. Scarify, reshape, compact, and manipulate any portions that lack the required smoothness or accuracy. Apply calcium chloride solution to the finished reclaimed base course surface at a minimum rate of 0.25 gal/sq yd.
406.04 Method of Measurement.
Full Depth Reclamation with Calcium Chloride will be measured by the number of square yards of material placed/reclaimed.
Part 400 — Asphalt Pavements August 2025
SECTION 406 — FULL DEPTH RECLAMATION WITH CALCIUM CHLORIDE 400-27
406.05 Basis of Payment.
The Department will pay for the completed and accepted quantities at the Contract price as follows. Pay Item Pay Unit Full Depth Reclamation with Calcium Chloride SY The Contract price for Full Depth Reclamation with Calcium Chloride constitutes full compensation for all labor, materials, and equipment, including cleaning and sweeping, saw cutting of pavement, removal & disposal of flexible pavement and rigid base, scarifying, mixing, pulverizing, spreading, reshaping, calcium chloride and water for compaction and dust control, regrading, rolling, compacting, trimming and fine grading of subgrade and subbase, the removal and disposal of unsuitable materials, hauling or other handling of recyclable materials off-site, the movement of surplus asphalt -stabilized base material from one location to another within the Project limits, placement and subsequent removal of temporary covers and structures, and all other incidentals required to finish the work, complete and accepted.
Part 400 — Asphalt Pavements August 2025
400-28 SECTION 407 This Section has been Reserved for Future Use.
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