Art. 402.01 Aggregate Surface Course
Division 400 — Surface Courses, Pavements, Rehabilitation,
AND SHOULDERS SECTION 401. RESERVED SECTION 402. AGGREGATE SURFACE COURSE
402.01 Description. This work shall consist of furnishing and placing one or
more courses of aggregate upon a prepared subgrade.
402.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Coarse Aggregate .............................................................................. 1004.04
b.RAP Material (Note 1) ............................................................................. 1031 Note 1. Reclaimed Asphalt Pavement (RAP) may be used as aggregate in surface course for temporary access entrances.
402.03 Equipment. Equipment shall be according to the following.
Item Article/Section
a.Tamping Rollers ................................................................................. 1101.01
b.Pneumatic-Tired Rollers .................................................................... 1101.01
c.Three-Wheel Rollers (Note 1) ............................................................ 1101.01
d.Tandem Rollers (Note 1) ................................................................... 1101.01
e.Aggregate Spreaders ......................................................................... 1102.04
f.Vibratory Machine (Note 2) Note 1. Three-wheel or tandem rollers shall weigh 6 to 10 tons (5.5 to 9 metric tons) and shall weigh not less than 200 lb/in. (35 N/mm) nor more than 325 lb/in. (57 N/mm) of width of the roller. Note 2. The vibratory machine shall meet the approval of the Engineer. CONSTRUCTION REQUIREMENTS
402.04 Subgrade. The subgrade shall be prepared according to Section 301,
except Article 301.07 shall not apply.
402.05 Type A Requirements. Aggregate surface course, Type A, shall be
constructed according to Article 351.05 for Type A aggregate base course, except the bearing ratio requirements shall not apply.
402.06 Tolerance in Surface Course Type A Thickness. The surface
course shall be constructed to the thickness shown on the plans. Thickness determinations will be made at such points as the Engineer may select. When the constructed thickness is less than 90 percent of the thickness shown on the plans, aggregate shall be added to obtain the required thickness. Aggregate Surface Course Art. 402.11
402.07 Type B Requirements. Any one or two gradations of the material
specified in Article 1004.04 shall be used except where two gradations of material are used, the change shall not be made at more than one location on the section. The surfacing material shall be deposited on the subgrade by means of a spreader. The equipment used shall be such that the required amount of material will be deposited uniformly along the central portion of the roadbed. The material which has been deposited shall be spread immediately to the plan cross section. Hauling shall be routed over the spread material so it will cover the entire width of surface. If the equipment used in the hauling operations causes ruts extending through the spread material and into the subgrade, and the subgrade material is being mixed with the surfacing material, the equipment shall be removed from the work or the rutting otherwise prevented as directed by the Engineer. The Contractor shall keep the surface smooth by dragging or blading as many times each day as the Engineer may direct. Holes, waves, and undulations which develop and which are not filled by blading shall be filled by adding more material.
402.08 At Bridges, Railroad Grade Crossings, and Existing Pavement.
The surface course adjacent to bridges, railroad grade crossings, and existing pavement shall have a depth equal to the thickness of the typical section at the bridge, railroad grade crossing or existing pavement with the surface at the established grade. The width at bridges and railroad grade crossings shall be 2 ft (600 mm) wider than the surface course width shown on the typical section. At existing pavement, the width shall be as shown on the plans or as directed by the Engineer. The depth and width transition at the bridge, railroad grade crossing or existing pavement shall be made at a uniform rate within a distance of 50 ft (15 m).
402.09 At Side Roads, Entrances, and Mailboxes. The same type and
gradation of material used for constructing the surface course shall be used at side roads, entrances, and mailbox turnouts.
402.10 For Temporary Access. The Contractor shall construct and maintain
an aggregate surface course for temporary roads, approaches, and entrances according to Article 402.07 and as directed by the Engineer. The same type and gradation of material used to construct the temporary access shall be used to maintain it. When use of the temporary access is discontinued, the surface aggregate used in its construction shall be removed and utilized in the permanent construction or disposed of according to Article 202.03.
402.11 Shaping, Trimming and Finishing. All shaping, trimming, and
finishing shall be according to Section 212. Art. 402.12 Micro-Surfacing and Slurry Sealing
402.12 Method of Measurement. Aggregate used for aggregate surface
course will be measured for payment in tons (metric tons), cubic yards (cubic meters), or square yards (square meters) of the thickness specified, according to the requirements of Article 311.08. The cost of excavation for the transition at the bridge, railroad crossing, or existing pavement will not be measured for payment.
402.13 Basis of Payment. This work will be paid for at the contract unit price
per ton (metric ton) for AGGREGATE SURFACE COURSE, TYPE A, or AGGREGATE SURFACE COURSE, TYPE B; or at the contract unit price per cubic yard (cubic meter) for AGGREGATE SURFACE COURSE, TYPE A; or AGGREGATE SURFACE COURSE, TYPE B; or at the contract unit price per square yard (square meter) for AGGREGATE SURFACE COURSE, TYPE A; of the thickness specified. Aggregate for temporary access will be paid for at the contract unit price per ton (metric ton) for AGGREGATE FOR TEMPORARY ACCESS. BITUMINOUS SURFACES AND HOT-MIX ASPHALT PAVEMENTS SECTION 403. RESERVED SECTION 404. MICRO-SURFACING AND SLURRY SEALING
404.01 Description. This work shall consist of micro-surfacing or slurry
sealing existing hot-mix asphalt (HMA) surfaces.
404.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Cement (Note 1) ..................................................................................... 1001
b.Water ...................................................................................................... 1002
c.Fine Aggregate .................................................................................. 1003.08
d.Bituminous Material (Tack Coat) ........................................................ 1032.06
e.Emulsified Asphalts (Note 2) (Note 3) ................................................ 1032.06
f.Fiber Modified Joint Sealer ................................................................ 1050.05
Referenced in this section
Sections that cite this one
AGGREGATE SURFACE COURSE in other states
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 197–199 of 1,217. View official source ↗