Portland Cement Concrete Base Course Widening Art. 354.05
353.14 Basis of Payment. This work will be paid for at the contract unit
prices per square yard (square meter) for PORTLAND CEMENT CONCRETE BASE COURSE and HIGH-EARLY-STRENGTH PORTLAND CEMENT CONCRETE BASE COURSE, of the thickness specified. Reinforcement bars in special concrete slabs will be paid for according to
Article 508 — 11.
The unit prices bid for the various items of portland cement concrete base course shall include any added thickness of base course adjacent to railroad grade crossings. HMA plugs at railroad grade crossings will be paid for at the contract unit price per ton (metric ton) according to Article 406.14 for Hot-Mix Asphalt Binder Course, of the mixture composition and Ndesign specified. SECTION 354. PORTLAND CEMENT CONCRETE BASE COURSE WIDENING
354.01 Description. This work shall consist of widening existing pavement
with a portland cement concrete base course widening not exceeding 6 ft (1.8 m) in width.
354.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Portland Cement Concrete ..................................................................... 1020
354.03 Equipment. Equipment shall be according to the following.
Item Article/Section
a.Forms ................................................................................................ 1103.05
b.Formless Paver .................................................................................. 1103.16
c.Finishing Machine .............................................................................. 1103.13
d.Concrete Finisher Float ..................................................................... 1103.14
e.Miscellaneous Equipment .................................................................. 1103.17
f.Membrane Curing Equipment ........................................................ 1101.09(c) CONSTRUCTION REQUIREMENTS
354.04 General. The methods used in performing the following items of work
shall be according to the requirements shown in the Articles listed below. The use of slip form methods will be permitted at the option of the Contractor. Item Article/Section
a.Removing Forms ................................................................................. 420.11
b.Opening and Keeping Road Open to Traffic ............................... 701.17(c)(5)
354.05 Subgrade. The subgrade shall be prepared according to
Article 420 — 04, except as follows.
Art. 354.05 Portland Cement Concrete Base Course Widening
a.The subgrade excavation shall be to the required depth for at least the full width of the proposed base course widening prior to placing the concrete. Excavation of the subgrade shall be as specified in Article 202.06.
b.The subgrade shall be rolled with a roller of a type approved by the Engineer. It shall be not less than 12 in. (300 mm) in width and shall weigh from 50 to 100 lb/in. (9 to 18 N/mm) of width of the roller.
c.Truck mixers or trucks will be permitted on the finished subgrade when approved by the Engineer. Approval will be withdrawn if rutting develops in the subgrade or subbase which reduces the plan thickness of the base course.
354.06 Constructing Without Forms. If the base course widening is
constructed without forms, it shall be according to Article 420.14.
354.07 Constructing With Forms. If the base course widening is
constructed with forms, the following requirements shall apply.
a.Forms and Form Setting. Forms and form setting shall be according to the requirements of Article 420.06, except that the use of a mechanical form tamper will not be required.
c.Longitudinal Floating. The concrete shall have an even and uniform surface by the use of hand floats according to Article 420.09(b)(2).
354.08 Reserved.
354.09 Tolerance in Thickness. The thickness of 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. Temporary construction is defined as those areas 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. The procedure described in Article 407.10(b) will be followed, except:
a.The width of a unit shall be the width of the widening along one edge of the pavement.
b.The length of the unit shall be 1000 ft (300 m). Hot-Mix Asphalt Base Course Art. 355.05
c.The option of correcting deficient pavement with additional lift(s) shall not apply.
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.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 190–192 of 1,217. View official source ↗