355HOT-MIX ASPHALT BASE COURSE

354.10 Backfill at Edge. Within 24 hours after completion of the base course

widening, the remaining portion of the widening trench shall be backfilled as specified in Article 202.06. Prior to opening the base course widening to traffic, the Contractor shall compact the earth backfill adjacent to the base course. Compaction shall be obtained with a pneumatic-tired roller, to the satisfaction of the Engineer.

354.11 Earth Shoulders. At locations where no provisions have been made

for the repair or improvement of the earth shoulders, they shall be left in as good a condition as they were before work was started. Such work as the Contractor may have to perform to meet this requirement shall be performed at no additional cost to the Department.

354.12 Method of Measurement. Portland cement concrete base course

widening will be measured for payment according to Article 353.13.

354.13 Basis of Payment. Where the Department requires that portland

cement concrete be used, this work will be paid for at the contract unit prices per square yard (square meter) for PORTLAND CEMENT CONCRETE BASE COURSE WIDENING and HIGH-EARLY-STRENGTH PORTLAND CEMENT CONCRETE BASE COURSE WIDENING, each of the thickness specified. When the Contractor has the option of using either portland cement concrete 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 355. HOT-MIX ASPHALT BASE COURSE

355.01 Description. This work shall consist of constructing hot-mix asphalt

(HMA) base course on a prepared subgrade.

355.02 Materials. Materials shall be according to Section 1030.

The mixture composition used shall be IL-19.0.

355.03 Equipment. Equipment shall be according to Article 406.03.

CONSTRUCTION REQUIREMENTS

355.04 Subgrade. The subgrade shall be prepared according to Section 301,

except Articles 301.05 and 301.06 will not apply, or according to Section 302 when soil modification is used.

355.05 Placing and Compacting. Prior to placing HMA base course

adjacent to an existing pavement, the exposed edge of the existing pavement shall be cleaned of loose material to the satisfaction of the Engineer. 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.