Art. 358.01 Repair and Preparation of Base Course SECTION 358. REPAIR AND PREPARATION OF BASE COURSE
358.01 Description. This work shall consist of the repair and preparation of
existing surfaces, which are to be used as bases for the various types of surface courses.
358.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Coarse Aggregate .............................................................................. 1004.04
358.03 Equipment. Equipment shall be according to the following.
Item Article/Section
a.Pneumatic-Tired Rollers .................................................................... 1101.01
b.Mechanical Sweeper ......................................................................... 1101.03 CONSTRUCTION REQUIREMENTS
358.04 Aggregate Bases. All loose materials on the surface of the proposed
base course which are of such size, gradation, and quality that they can be utilized, shall be bladed to the shoulders and left in windrows together with any material already in windrows or stockpiles. All such materials shall be incorporated in the work or disposed of as directed by the Engineer. The repair and preparation of newly constructed bases shall not be undertaken until it has been opened to traffic for a period of not less than ten days.
a.Repairs. All failures (potholes, deep depressions, or ruts) occurring in the existing surface to be used as the base, shall be repaired by scarifying, removing all foreign material, and reshaping. If additional material is needed to bring the surface to the required cross section, CA 6 aggregate shall be used. The repaired areas shall then be compacted thoroughly by means of a pneumatic-tired roller or a hand tamper as directed by the Engineer. If the moisture content of the aggregate is such that compaction satisfactory to the Engineer cannot be obtained, water shall be added.
b.Preparation. After the repairs have been made in the base course, any area having ruts, depressions, corrugations, excessive crown, or loose material shall be brought to a smooth grade and proper crown by repeatedly wetting with water applied by means of a sprinkler, blading with a road grader or multiple blade maintainer, and rolling with a pneumatic-tired roller. The base course shall be bladed lightly to such a depth that sufficient material will be obtained to true up the surface of the base course. During the smoothing operations, the roadbed from the edges of the base to the shoulder lines shall be bladed to a smooth uniform slope so that the surface will drain and not impound water. After the surface of the base course has been brought to a smooth grade and proper crown, it shall be compacted by repeated wetting and rolling with a pneumatic-tired roller for a period of not less than two days. During this Repair and Preparation of Base Course Art. 358.07 time, the surface shall be kept in a damp condition. Before a prime coat is applied, the base shall be surface dry, but at no time shall the period of drying be less than 24 hours. When required by the Engineer, the base course shall be swept with a mechanical sweeper or hand brooms before a prime coat is applied. The sweeping shall be continued until all dust, mud and foreign material are removed. Traffic shall not be allowed upon the prepared base course after the final sprinkling, or, if a bituminous prime coat has been applied, until the Engineer has approved the penetration of the prime coat.
358.05 Old Bituminous, Brick, and Concrete. Repair of old bituminous,
brick, and concrete bases shall be as follows.
a.Repair. All loose and defective material shall be removed from all holes, ruts, or depressions in the existing surface. These areas shall then be filled as provided in the contract.
b.Preparation. After the base course has been patched and permitted to cure, it shall be cleaned by means of a mechanical sweeper, hand brooms, flushing with water, or by other approved methods. Special care shall be taken to clean the surface of the base course adjacent to the edges, so that the full width of the surface to be treated will be clean. The surface of the base course shall be clean and dry when the surface course is placed.
358.06 Method of Measurement. This work will be measured for payment as
follows.
a.Contract Quantities. The requirement for use of contract quantities shall be according to Article 202.07(a).
b.Measured Quantities. The work in connection with the repair and preparation of bases, except materials, will be measured for payment in place and the area computed in square yards (square meters). If additional material is required for the repair of aggregate bases, it will be measured for payment in tons (metric tons) according to the requirements of
Article 311 — 08(b).
If additional material is required for the repair of old bituminous, brick, or concrete bases, it will be measured for payment as provided for in the contract.
358.07 Basis of Payment. The work in connection with the repair and
preparation of bases, except materials, will be paid for at the contract unit price per square yard (square meter) for PREPARATION OF BASE. Additional material required for the repair of aggregate bases, will be paid for at the contract unit price per ton (metric ton) for AGGREGATE BASE REPAIR. When the contract does not contain a unit price for the material required for the repair of any type base, it will be paid for according to Article 109.04. 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.
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 195–197 of 1,217. View official source ↗