109 ALASKA 2020 SECTION 302 SUBGRADE MODIFICATIO N
302-1.01 DESCRIPTION . Scarify the existing road surface, incorporate aggregate and additives,
if required , and grade and compact the material to the typical section shown on the Plans. Realign the shoulders and clean and reshape the ditches, if required on the Plans.
302-2.01 MATERIALS. As shown on the Plans or specified in the Special Provisions.
CONSTRUCTI ON REQUIREMENTS
302-3.01 PROCESSING. Blade the shoulder slopes and ditches to form a uniform shoulder line.
First remove and dispose of weeds, sod, grass, roots, or other objectionable material from the surface. Spread the useable material obtained from the shoulder slopes and ditches and the surfacing material existing on the road surface uniformly over the roadbed. Scarify the road surface to the depth specified. Pulverize lumps as needed so that not more than 5 percent of the material exclusive of gravel or stone is retained on a 2- inch sieve. Mix material thoroughly. Form the mixed material into a uniform windrow. Place the quantity of aggregate for subgrade modification, as designated on the Plans, in a uniform windrow. Blend the windrowed materials t ogether until all materials are uniformly distributed throughout the combined windrow. Aggregate will be accepted at the point of production based on periodic samples. Spread the material uniformly to the required cross section and compact to meet Subsec tion 203- 3.04. When the material being compacted contains a significant quantity of pulverized asphalt, adequacy of compaction will be determined by alternative methods acceptable to the Engineer.
302-3.02 FINISHING. The finished surface will be tested usi ng a 10- foot straightedge at selected
locations. Limit surface deviations to 1- 1/4 inches, as measured from the testing edge of the straightedge between two contacts with the surface. If a base or surface course is included in the Contract, maintain the s urface of the completed subgrade until the base or surface course has been placed.
302-4.01 METHOD OF M EASUREMENT. See Section 109 and the following:
Aggregate for subgrade modification is weighed or measured in the hauling vehicle. Processing for subgrade modification is measured along centerline.
302-5.01 BASIS OF PA YMENT. The contract price for processing includes all blading of ditches
and shoulders, if called for on the Plans; scarifying and pulverizing of the existing surface; all placing and mixing of materials on the road; disposal of unsuitable material; the compacting of the materials; the finishing of the surface; and the maintenance of the completed surface when applicable Water for compaction added to the aggregate on the grade is subsidiary. 110 ALASKA 2020 Payment will be made under: PAY ITEM Item Number Item Description Unit 302.0001.____ Aggregate for Subgrade Modification TON 302.0002.____ Aggregate for Subgrade Modification CYVM 302.0003.____ Processing for Subgrade Modification STA 302.0004.____ Processing for Subgrade Modification MILE 111 ALASKA 2020 SECTION 303 RECONDITIONING
303-1.01 DESCRIPTION . Recondition the surface of an existing roadbed, clean and recondition
the ditches, and shape the shoulders.
303-2.01 MATERIALS. None.
303-3.01 CONSTRUCTIO N REQU IREMENTS. Scarify the existing surface to the depth shown
on the Plans. Pulverize material to 2 inches or smaller. Clean and recondition the ditches and shape the shoulders as shown on the Plans. Spread surface material to line and grade and compact uniformly as specified in Subsection 203- 3.04. Compact pulverized asphalt using alternate method acceptable to the Engineer. The reconditioned surface will be tested using a 10- foot straightedge at selected locations. Limit surface deviations to 1 inch prior to placement of a base course or 3/8 inch prior to placement of a surface course, as measured from the testing edge of the straightedge between two contacts with the surface. Maintain the surface satisfactorily until the base or surface course has been plac ed. Apply additional water, as required.
303-4.01 METHOD OF M EASUREMENT. See Section 109.
303-5.01 BASIS OF PA YMENT. Water required for compaction and maintenance is subsidiary.
Payment will be made under: PAY ITEM Item Number Item Description Unit 303.0001.____ Reconditioning STA 303.0002.____ Reconditioning MILE 303.0003.____ Reconditioning LS