401.01 DESCRIPTION. Furnish and construct aggregate surface
courses for roadways, shoulders, drives, or other facilities in accordance with these specifications, and in conformity with the lines, grades, thicknesses, and typical sections shown on the plans or already established.
401.02 MATERIALS. Furnish materials complying with the following
subsections. Stone 1003.01 & 1003.05.1 Sand-Clay-Gravel (Lime Treated) 1003.01 & 1003.05.2 Reclaimed Portland Cement Concrete 1003.01.3.1 & 1003.05.1 Reclaimed Asphalt Pavement 1003.01.3.2 & 1003.05.3 Water 1018.01 Lime 1018.02 Use uniformly blended aggregate surface course materials that have been sampled and approved prior to placement. Unless otherwise approved in writing, use the same type material throughout the project.
401.03 EQUIPMENT. Furnish and maintain equipment necessary to
produce a finished product meeting the requirements of these specifications. Obtain approval of equipment prior to use.
401.04 Construction.
401.04.1 General: Obtain approval of the subgrade before placing
aggregate surface course. Uniformly spread material removed from shoulders adjacent to the shoulder material. On existing surfaces, where only placing aggregate surface course, remove vegetation, shape, and satisfactorily compact the surface prior to placing aggregate surfacing. For new or reconstructed surfaces construct subgrade in accordance with Section 203.
401.05 PLACING MATERIALS. Place material directly on the
prepared and approved subgrade. Do not place surface course on damaged subgrade until repairs conforming to 401.04 have been completed and approved. Do not place or spread aggregate surfacing materials on adjacent portland cement concrete or asphalt concrete pavements. Conduct aggregate surfacing operations so that pavement surfaces, edges, and joints are not damaged. Repairs to damaged areas shall be at no expense to the Department.
401.06 MIXING. Uniformly mix sand-clay-gravel with 6 percent lime by
volume; for central mixing, use 5 percent lime. The sand-clay-gravel shall be sampled and approved prior to treatment with lime. Add moisture to adequately control compaction.
401.07 Shaping and Compacting Aggregate Surface
COURSE
401.07.1 General: Place material to required thickness, shape to the
required section, and compact with an approved roller to a tight, uniform surface free from ruts and waves.
401.07.2 Stone and Recycled Portland Cement Concrete:
After initial compaction, wet the surface as directed.
401.07.3 Reclaimed Asphalt Pavement: Compact with at least
three passes of a roller approved by the Project Engineer.
401.07.4 Lime Treated Sand-Clay-Gravel: Compact and finish
lime treated sand-clay-gravel within 72 hours after initial mixing with lime. If not compacted and finished within 72 hours, due to contractor’s operations, recut lime at half the specified rate at no additional cost to the Department.
401.08 DIMENSIONAL TOLERANCES. When specifying net section
measurement, the thickness and width of completed aggregate surface course will be checked for acceptance in accordance with DOTD TR 602. Correct to plan dimensions areas with deficiencies in excess of the following tolerances as required at no additional cost to the department.
401.08.1 Thickness: Under-thickness shall not exceed 3/4 inch.
Over-thickness may be waived at no additional cost to the Department.
401.08.2 Width: Under-widths shall not exceed 3 inches for
shoulders and 6 inches for roadways. Over-width may be waived at no additional cost to the Department. When using vehicular measurement, the engineer will take measurements to ensure the work’s conformance to plan dimensions.
401.09 Measurement.
401.09.1 Net Section: The quantities of aggregate surface course
for payment will be the design volumes as shown on the plans and adjustments thereto. Base design quantities on the horizontal dimensions and the compacted thickness of the completed aggregate surface course shown on the plans. Design quantities will be adjusted if the engineer makes changes to adjust to field conditions, plan errors are proven, or design changes are necessary.
401.09.2 Adjusted Vehicular Measurement: Surface course
material will be measured at the point of delivery by the cubic yard in approved hauling vehicles in accordance with 109.01. Materials delivered by volume will be measured by the cubic yard in hauling vehicles and divided by the factors in Table 401-1 to determine the pay volume: Table 401-1 Adjusted Vehicular Measurement (Materials Delivered by Volume) Material Factor Stone 1.30 Lime Treated Sand-Clay-Gravel 1.30 Recycled Portland Cement Concrete 1.30 Reclaimed Asphalt Pavement 1.50 Materials delivered by weight will be measured by the ton (2000 pounds) in hauling vehicles and divided by the factors in Table 401-2 to determine the pay volume: Table 401-2 Adjusted Vehicular Measurement (Materials Delivered by Weight) Material Tons to Cubic Yards, Factor Limestone 1.95 Sandstone 1.82 Porous Limestone 1.76 Lime Treated Sand-Clay-Gravel 1.89 Recycled Portland Cement Concrete 1.82 Reclaimed Asphalt Pavement 1.80
401.10 PAYMENT. Payment for aggregate surface course will be made
at the contract unit price per cubic yard, which includes preparation of existing roadways and shoulders, and furnishing, placing, and compacting required aggregate materials, water, and lime. Payment will be made under: Item No. Pay Item Pay Unit 401-01 Aggregate Surface Course (Net Section) Cubic Yard 401-02 Aggregate Surface Course (Adjusted Vehicular Measurement) Cubic Yard
Aggregate Surface Course in other states
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