501 — UNTREATED AGGREGATE BASE COURSES CATEGORY 500 PAVING SECTION 501 — UNTREATED AGGREGATE BASE COURSES
501.01 Description
Construct base courses using one of the following:
a.Graded aggregate without a stabilizing agent.
b.Recycled Concrete Graded Aggregate
501.02 Materials
Graded Aggregate for Base Course 901.01 Recycled Concrete, Graded Aggregate 900.03.02 Production Plant Section 915 Water 921.01 Moisture and Dust Control Agents 921.02
501.03 Construction
At least 30 days prior to the start of constructing the base course, submit the proposed plants, equipment, and material sources for approval. Protect the subgrade and base against damage from all causes. Repair or replace damaged areas. Unless protected by a concrete traffic barrier, limit excavation for widening to an area that can be wedged the same day using graded aggregate base. Refer to Standard No. 104.01-28 for the area to be wedged. Maintain the temporary graded aggregate base wedge with a 4:1 or flatter fill slope when there is no barrier. Compact the material as indicated elsewhere in this specification. Leave the graded aggregate base wedge in place until placement of the next layer.
501.03.01 Equipment. All equipment, including the production plant and on-site equipment, is
subject to approval. Have the plant ready for inspection at least 48 hours prior to the start of construction operations. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 619–618 of 1,113.