Art. 355.06 Hot-Mix Asphalt Base Course Widening HMA base course shall be placed according to Article 407.06 and compacted according to Article 406.07.
355.06 Hauling. Hauling on newly placed HMA base course shall be
according to Article 407.08.
355.07 Surface Test. The completed base course will be tested for trueness
in each wheel lane by means of a 16 ft (5 m) straightedge placed parallel to the centerline of the pavement, parallel to the grade line and touching the surface. Surface variations of the base measured from the base of the straightedge to the surface of the pavement shall not exceed 3/8 in. (10 mm). Areas which have variations exceeding 3/8 in. in 16 ft (10 mm in 5 m) shall be corrected as directed by the Engineer.
355.08 Tolerance in Thickness. The thickness of HMA base course pay
items that individually contain at least 1000 sq yd (840 sq m) of contiguous area, except for temporary construction; bike paths and individual locations less than 500 ft (150 m) long, will be evaluated according to Article 407.10(b). Temporary construction is defined as those areas constructed and removed under the same contract. If the base course cannot be cored for thickness prior to placement of the cover layer(s), the Engineer will determine the thickness of the cover layer(s), and subtract them from the measured core thickness to determine the base course thickness.
355.09 Method of Measurement. HMA base course will be measured for
payment according to the requirements of Article 353.13.
355.10 Basis of Payment. This work will be paid for at the contract unit price
per square yard (square meter) for HOT-MIX ASPHALT BASE COURSE, of the thickness specified. SECTION 356. HOT-MIX ASPHALT BASE COURSE WIDENING
356.01 Description. This work shall consist of widening existing pavement
with a hot-mix asphalt (HMA) base course widening not exceeding 6 ft (1.8 m).
356.02 Materials. Materials shall be according to Article 355.02.
356.03 Equipment. Equipment shall be according to Article 406.03. A
mechanical spreader meeting the approval of the Engineer shall be used to place the HMA. CONSTRUCTION REQUIREMENTS
356.04 Subgrade. The material adjacent to the edge of the existing
pavement shall be excavated for the full width required and to the required depth according to Section 202. Hot-Mix Asphalt Base Course Widening Art. 356.10 The subgrade shall be prepared according to Section 301, except Articles 301.05 and 301.06 will not apply, and compacted according to Article 354.05(b). When soil modification is used, preparation shall be according to Section 302.
356.05 Placing and Compacting. HMA base course widening shall be
placed and compacted according to Article 355.05. Only one lift of HMA shall be placed in a day, regardless of its thickness, unless authorized by the Engineer. While compacting the top lift, the rollers shall be kept off the edge of the existing pavement.
356.06 Tolerance in Thickness. The thickness of HMA base course
widening pay items that individually contain at least 1000 sq yd (840 sq m) of contiguous area, except for temporary construction; bike paths and individual locations less than 3 ft (1 m) wide or 1000 ft (300 m) long, will be evaluated according to Article 407.10(b) except, the width of a unit shall be the width of the widening along one edge of the pavement and the length of a unit shall be 1000 ft (300 m). Temporary locations are defined as those constructed and removed under the same contract. If the base course widening cannot be cored for thickness prior to placement of the cover layer(s), the Engineer will determine the thickness of the cover layer(s)and subtract them from the measured core thickness to determine the base course widening thickness.
356.07 Backfill at Edge of Widening. Backfilling at the edge of widening
shall be performed as specified in Article 354.10.
356.08 Earth Shoulders. Earth shoulders shall be constructed according to
Article 354 — 11.
356.09 Method of Measurement. HMA base course widening will be
measured for payment according to Article 353.13.
356.10 Basis of Payment. Where the Department requires that HMA be
used, this work will be paid for at the contract unit price per square yard (square meter) for HOT-MIX ASPHALT BASE COURSE WIDENING, of the thickness specified. When the Contractor has the option of using either portland cement concrete as outlined in Section 354 or HMA according to Section 356, the work will be paid for at the contract unit price per square yard (square meter) for BASE COURSE WIDENING, of the thickness specified. SECTION 357. RESERVED 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
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 193–195 of 1,217. View official source ↗