SECTION 301 – AGGREGATE AND GRAVEL BASE COURSES 300-1
Part 300
AGGREGATE AND GRAVEL BASE AND SUBBASE COURSES – AGGREGATE AND GRAVEL BASE COURSES
301.01 Description.
This work includes providing one or more courses of graded aggregate or gravel borrow and fillers, if required, on prepared subgrade surfaces.
301.02 Materials.
Use materials that conform to SECTION M: • Gravel Borrow ― Subsection M01.09, Column I in Table • Crushed Stone or Gravel ― Subsection M01.09, Column II in Table • Fillers ― Subsection M01.08
301.03 Construction Methods.
Placing. If the required compacted depth of base course exceeds 12 in., construct the base in two or more layers of approximately equal thickness. Ensure that the maximum compacted thickness of any layer does not exceed 12 in. Ensure that the maximum size of ston e in the gravel borrow or aggregate placed does not exceed ¾ of the layer depth after compaction. This restriction determines the maximum size of stone in the gravel borrow specification in Subsection M01.09. Ensure that all materials meet all specifications before placement. Do not cull deleterious or out of specification material after placement and/or grading in-place, unless directed otherwise by the Engineer. Shaping and Compaction. Continue compacting each layer until a density of not less than 95 percent of the maximum density as determined according to AASHTO T180 has been achieved. Maintain the surface of each layer during the compaction operations to produce reasonable uniformit y. Ensure that the compacted surface has a tolerance of ±½ in. for the required grades. However, ensure that no deviation continues for more than 100 ft in any direction. Adjust the field moisture content for gravel borrow to be no more than ±2 percent when compared to the optimum moisture content.
301.04 Method of Measurement.
Aggregate Base Course and/or Gravel Borrow Base Course will be measured by the number of cubic yards according to Subsection 109.01.
Part 300 — Aggregate and Gravel Base and Subbase Courses August 2025
300-2 SECTION 301 – AGGREGATE AND GRAVEL BASE COURSES
301.05 Basis of Payment.
The Department will pay for the completed and accepted quantities at the Contract unit prices as follows. Pay Item Pay Unit Aggregate Base Course CY Gravel Borrow Base Course CY The price constitutes full compensation for all labor, materials, equipment, and all incidentals, including trimming and fine grading, required to finish the work, complete and accepted.
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