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The work covered by this section consists of furnishing, placing, and mixing the required amount of aggregate with the subgrade materials, shaping the stabilized subgrade to the required grade and typical section, and compacting.
The aggregate shall meet the requirements of Division 10 shown below:
Stabilizer aggregate Article 1008-1
(A) Mixing:
Sufficient subgrade material shall be removed, if necessary, to compensate for the addition of the stabilizer aggregate. The quantity of aggregate required by the plans or special provisions, or established by the Engineer, shall be spread uniformly over the subgrade by means of a mechanical spreader unless otherwise permitted by the Engineer. Aggregate shall be spread on the subgrade in advance of the mixing operations only to the extent that processing can be completed within one week. The aggregate shall then be mixed with the top 3 inches of the subgrade soil. Mixing shall continue until the aggregate is uniformly mixed with the soil to the width and depth to be treated.
The aggregate shall have been sampled, tested, and approved prior to the placing layers of base material or pavement thereon.
(B) Shaping and Compaction:
The stabilized subgrade shall be shaped to the lines, grades, and typical sections shown on the plans or established by the Engineer.
The entire depth and width of the stabilized subgrade shall be compacted to a density equal to at least 100% of that obtained by compacting a sample of the material in accordance with AASHTO T99 as modified by the Department. Copies of these modified testing procedures are available upon request from the Materials and Tests Unit.
The stabilized subgrade shall be compacted at a moisture content which is approximately that required to produce the maximum density indicated by the above test method. The Contractor shall dry or add moisture to the material when required to provide a uniformly compacted and acceptable subgrade.
A tolerance of plus or minus 1/2 inch from the established grade will be permitted after the stabilized subgrade has been graded to a uniform surface.
The maximum differential between the established grade and the stabilized subgrade within any 100 foot distance shall be 1/2 inch.
The provisions of Article 5004 will be applicable to the protection of the aggregate stabilized subgrade.
The quantity of stabilizer aggregate to be paid for will be the actual number of tons of aggregate, exclusive of any corrective material, which have been mixed with the completed and accepted subgrade. This quantity will be measured as provided for in Article 52012.
The quantity of stabilizer aggregate, measured as provided in Article 5106, will be paid for at the contract unit price per ton for "Stabilizer Aggregate." Such price and payment will be full compensation for all work covered by this section including but not limited to excavating, furnishing all aggregate and water, hauling, spreading, mixing, shaping, compaction, and maintenance.
Payment will be made under:
Stabilizer Aggregate Ton