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Home / DOT Specifications / Delaware / Standard Specifications for Road & Bridge Construction / 301
BASE COURSES

301GRADED AGGREGATE BASE COURSE

DE · 2026 Standard Specifications✓ Full text on BuildSpecBook pages 137–0 Save this section

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301.1Description.

This work consists of constructing GABC on a prepared subgrade or subbase.

301.2Materials.

A.Coarse Aggregate Section 1004
B.Graded Aggregate Section 1005

301.3Construction.

A.Shape the subgrade to grade and cross section in accordance with the contract and Section

202.3.5.

B.Place material so that no segregation occurs. Use a water sprinkling device and rollers or

compactors.

C.Place graded aggregate material in successive layers, with a maximum layer thickness of 8

uncompacted inches to prevent segregation and with a maximum surface deviation of 1/2-inch in 10-feet.

D.Compact each layer to 98 percent or more of the maximum density.
1.If bituminous millings are used as GABC within the roadway pavement box, compact with a

sheepsfoot roller to the satisfaction of the engineer.

E.When using GABC from different sources, keep materials for a single project in separate

stockpiles. The contractor and engineer must agree on placement limits when the contractor plans to use multiple material sources. Ensure that each area of base course constructed is from a single source for full depth placement within agreed limits.

F.The Department will not allow Recycled Concrete Aggregates (RCA) as the final project surface.

301.4Method of Measurement.

A.The Department will measure the total quantity of material from all sources as the number of

cubic yards or tons of GABC placed and accepted. The Department will determine weight in accordance with Section 109.1.

B.Refer to the Department’s Material Average Weight Chart for conversion factors from cubic yards

to tons for the respective material.

301.5Basis of Payment.

A.The Department will pay for GABC and recycled material at the contract unit price per cubic yard

or ton for preparing, providing, placing, and compacting all materials. The Department will make no additional payment for work performed to bring recycled concrete aggregate or bituminous concrete millings into compliance with requirements specified in Section 1005.

B.If the contractor generates recycled GABC from materials milled or excavated under other items in

the contract, the Department will make payments under the milling or excavating items and the GABC item. ITEM DESCRIPTION UNIT 301001 GABC CY 301002 GABC PATCHING CY 301003 GABC TON 301004 GABC PATCHING TON 301005 RECYCLED CONCRETE AGGREGATE CY 301006 RECYCLED ASPHALT PAVEMENT CY 301007 RECYCLED CONCRETE AGGREGATE TON 301008 RECYCLED ASPHALT PAVEMENT TON

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Source: Delaware Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 137–0 of 786. View official source ↗
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