107 ALASKA 2020 DIVISION 300 –BASES SECTION 301 AGGREGATE BASE AND S URFACE COURSE
301-1.01 D ESCRIPTION. Construct an aggregate base course or aggregate surface course on
an approved foundation, as shown on the Plans.
301-2.01 MATERIALS. Use aggregate conforming to Subsection 703- 2.03.
Crushed glass may be combined with soil -aggregate material to be used in base course construction. Meet 703- 2.15 requirements. CONSTRUCTION REQUIREMENTS
301-3.01 PLACING. Place material in layers not exceeding 8 inches in depth.
Maintain the roadway surface to drain freely at all times. When paving is specified in the Contract, schedule the work so that any base course placed will be covered prior to winter shutdown. Place surfacing material over all soil -aggregate bases containing glass cullet. Do not place base course soil -aggregate containing glass cullet:
1.Within four feet from the face of any embankment slope,
2.Within 150 feet from any surface water body,
3.In embankment areas where culvert placement is required,
4.In contact with any geosynthetic material.
301-3.02 MIXING. Mix the aggregate, incorporating any specif ied additives. Add water, as
needed, to provide the approximate optimum moisture content for compaction. Mix the aggregate by one of the following methods:
1.Stationary Plant Method
2.Travel Plant Method
3.Road Mix Method The aggregate will be accepted for gradation based on random samples taken for each lift from the roadway after spreading but prior to compaction.
301-3.03 SHAPING AND COMPACTION. The maximum density and optimum moisture will be
determined by ATM 207 or ATM 212. Spread and shape the material to the required grade and section. Water or aerate as necessary to provide the approximate optimum moisture content for compaction. Compact each layer to a density of not less than 98 percent of the maximum density. Acceptance densities will be determined by ATM 213 and ATM 214. Maintain the surface of each layer during the compaction operations in such manner that a uniform texture is produced and the aggregates firmly keyed.
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 135–134 of 584.