00640.44 691 Section 00640 - Aggregate Base and Shoulders Description
00640.00 Scope - This Work consists of furnishing and placing one or more Course s of Aggregate
Base and/or Shoulder s on a prepared surface to the lines, grades, thicknesses and Cross Sections shown or established. Materials
00640.10 Materials - Furnish Aggregate s of either 1" - 0 or 3/4" - 0 as the Contractor elects. Use
clean, hard, durable Aggregates, reasonably well -graded from the maximum size to dust.
00640.16 Acceptance of Aggregates - Acceptance will be visual by the Engineer.
Construction
00640.40 Preparation of F oundation - Provide a firm surface on which Aggregates are to be placed
according to Sections 00320, 00330, or 00610 as applicable .
00640.41 Hauling and Placing - Transport the Aggregate to the Project Site , add water to obtain
proper moisture content, and place on the prepared surface or material by means acceptable to the Engineer. Do not place Shoulder Aggregate s on the top Lift of newly constructed EAC or open-graded Pavement .
00640.42 Thickness and Number of Layers:
a.Base - If the required compacted depth of the Base Course exceeds 6 inches, construct it in two or more layers of nearly equal thickness. The maximum compacted thickness of any one layer shall not exceed 6 inches . Place each layer in spreads as wide as practicab le and to the full width of the Course before a succeeding layer is placed.
b.Shoulders - Place Shoulder Aggregates in a single layer, or two or more layers of nearly equal thickness. The maximum compacted thickness of any one layer shall not exceed 9 inches.
00640.43 Shaping and Compacting - Compact each layer of M aterial placed in Shoulder and Base
areas by rollers conforming in general to 00641.24 or as directed. Shape and maintain the surface of each layer during the compaction operations to meet the requirements of 00640.44. Produce a uniform texture and firmly key the Aggregates. Apply water over the Materials for proper compaction according to S ection 00340, and as directed. Continue the compactive effort until there is no reaction or yielding observed under the compactor.
00640.44 Surface Tolerance - The finished surface and the surface of each underlying layer of the
Aggregate shall parallel the established grade and Cross Section for the finished surface within 0.04 foot. 00640.60 692 The finished surface of the compacted Aggregate Base , when tested with a 12 -foot straightedge, shall not vary from the testing edge by more than 1/2 inch at any point. Furnish and operate the straightedge as directed. Maintenance
00640.60 Care of the Work - After construction of each layer and completion of Base , maintain the
layer to specified conditions and prevent or repair segregation, raveling, or rutting, until it is covered with a following layer or until all Work is completed. Measurement
00640.80 Measurement - The quantities of Aggregate will be measured on the weight basis, in the
hauling vehicle. Payment
00640.90 Payment - The accepted quantities of Aggregates will be paid for at the Contract unit price,
per unit of measurement, for the following items: Pay Item Unit of Measuremen t
a.Aggregate Base ..................................................................................... Ton
b.Aggregate Shoulders ............................................................................. Ton Payment will be payment in full for furnishing and placing all Material s, and for furnishing all Equipment , labor, and Incidental s necessary to complete the Work as specified. No separate or additional payment will be made for water used to obtain proper compaction and in the care of the Work .
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 757–758 of 1,268. View official source ↗