5-9 505-4 Measurement and Payment
Shallow Undercut of natural soil materials from subsoil for Type 1 aggregate subgrades will be measured and paid in cubic yards , measured in the original position and computed by the average end area method that is acceptably excavated in accordance with the contract . The contract unit price for Shallow Undercut will be full compensation for excavating, hauling and disposing of materials to construct aggregate subgrades. Undercut Excavation of natural soil materials from subsoil for Type 2 aggregat e subgrades will be measured and paid in accordance with Article 225 -7 or 226- 3. No measurement will be made for any undercut excavation of fill materials from subsoil. Class IV Subgrade Stabilization will be measured and paid in tons. Class IV subgrade stabilization will be measured by weighing material in trucks in accordance with
Article 106 — 7. The contract unit price for Class IV Subgrade Stabilization will be full
compensation for furnishing, hauling, handling, placing, compacting and maintaining ABC. Geotextile for Subgrade Stabilization will be measured and paid in square yards . Geotextiles will be measured along the ground surface as the square yar ds of exposed geotextiles before placing ABC. No measurement will be made for overlapping geotextiles. The contract unit price for Geotextile for Subgrade Stabilization will be full compensation for providing, transporting and installing geotextiles, wir e staples and anchor pins. Payment will be made under: Pay Item Pay Unit Shallow Undercut Cubic Yard Class IV Subgrade Stabilization Ton Geotextile for Subgrade Stabilization Square Yard
510-1 Description
Perform the work covered by this section including, but not limited to , furnishing all aggregate and water; hauling, spreading and mixing the required amount of aggregate wi th the subgrade materials; shaping and compacting the stabilized subgrade to the required grade and typical section; and maintaining the aggregate.
510-2 Materials
Refer to Div ision 10. Item Section Stabilizer Aggregate 1008 -1
510-3 Construction Methods
A.Mixing Remove sufficient subgrade material, if necessary, to compensate for the addition of the stabilizer aggregate. Spread the quantity of aggregate required by the contract uniformly over the subgrade by means of a mechanical spreader. Spread the aggregate on the subgrade in advance of the mixing operations only to the extent tha t processing can be completed within one week. Mix the aggregate with the top 3 inches of the subgrade soil. Continue mixing until the aggregate is uniformly mixed with the soil to the width and depth to be treated. The aggregate shall be sampled, tested and approved before placing layers of base material or pavement thereon.
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 237–237 of 857.