Art. 352.19 Portland Cement Concrete Base Course
1.Processing of soil-cement base course will be measured for payment in place and the area computed in square yards (square meters).
2.Cement incorporated in the soil-cement mixture will be measured for payment in hundredweights (kilograms), but payment will not be made for cement in excess of 105 percent of the amount specified by the Engineer.
3.Removal and disposal of unstable and/or unsuitable material will be measured for payment according to Article 202.07(b).
4.Replacement of unstable and/or unsuitable material will be measured for payment according to Article 204.07(b).
5.Cement treatment of unstable subgrade soil, when specified by the Engineer, will be measured for payment according to (1) and (2) above.
352.19 Basis of Payment. This work will be paid for at the contract unit
prices as follows.
a.Per square yard (square meter) for PROCESSING SOIL-CEMENT BASE COURSE, of the thickness specified.
b.Per hundredweight (kilogram) for CEMENT.
c.Removal and disposal of unstable and/or unsuitable material will be paid for according to Article 202.08.
d.Replacement of unstable or unsuitable material will be paid for according to
Article 204 — 08.
e.Cement treatment of unstable subgrade soil, when specified by the Engineer, will be paid for at the contract unit prices for (a) and (b) above. SECTION 353. PORTLAND CEMENT CONCRETE BASE COURSE
353.01 Description. This work shall consist of constructing a portland cement
concrete base with or without reinforcement as specified.
353.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Portland Cement Concrete ..................................................................... 1020
b.Reinforcement Bars ........................................................................... 1006.10
c.Longitudinal Metal Joints, Pins, and Bar Supports ......................... 1006.11(a) Portland Cement Concrete Base Course Art. 353.08
353.03 Equipment. Equipment shall be according to the following.
Item Article/Section
a.Forms ................................................................................................ 1103.05
b.Formless Paver .................................................................................. 1103.16
c.Subgrade Planer ................................................................................ 1103.08
d.Subgrade Machine ............................................................................. 1103.09
e.Finishing Machine .............................................................................. 1103.13
f.Concrete Finisher Float ..................................................................... 1103.14
g.Miscellaneous Equipment .................................................................. 1103.17
h.Membrane Curing Equipment ............................................................ 1101.09
i.Pavement Surface Grinding Equipment ............................................. 1101.04 CONSTRUCTION REQUIREMENTS
353.04 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 paving will be permitted at the option of the Contractor. These items of work shall be according to the following requirements. Item Article/Section
a.Preparation of Subgrade or Subbase .................................................. 420.04
b.Joints ................................................................................................... 420.05
c.Removing Forms ................................................................................. 420.11
d.Slip Form Method ................................................................................ 420.14
e.Tolerance in Thickness ........................................................................ 420.15
f.Opening to Traffic ....................................................................... 701.17(c)(5)
353.05 Forms and Form Setting. Forms and form setting shall be according
to Article 420.06, except that the use of a mechanical form tamper will not be required.
353.06 Placing. Placing concrete shall be according to Article 420.07.
Trucks or equipment will be permitted on the finished subgrade or subbase, when permitted by the Engineer. Approval will be withdrawn if rutting develops in the subgrade or subbase which would reduce the plan thickness of the base course.
353.07 Transverse Construction Joints. Transverse construction joints
shall be constructed according to Article 420.05(e), except that No. 6 (No. 20) tie bars 36 in. (900 mm) long shall be centered across the joint on 15 in. (375 mm) spacings.
353.08 Adjacent to Railroad Grade Crossing. Portland cement concrete
base course adjacent to railroad grade crossing shall be constructed according to
Article 420 — 17, except when the mainline portland cement concrete base course
thickness is greater than 9 in. (225 mm), the thickness of the portland cement concrete base course adjacent to the railroad grade crossing shall be constructed to the same thickness as the mainline. Art. 353.08 Portland Cement Concrete Base Course The HMA plug adjacent to railroad grade crossings shall be constructed of HMA binder course mixture according to the applicable requirements of Section 1030. At the Contractor’s option, HMA surface course mixture may be used in lieu of the binder course mixture.
353.09 Reserved.
353.10 Strike Off, Consolidation, Finishing, Longitudinal Floating,
Straightedging, Edging, and Final Finish. The base course shall be constructed according to Article 420.09, except the straightedging specified under
Article 420 — 09(c) shall not be performed until the entire surface does not vary more
than 3/16 in. (5 mm) from the straightedge and the final finish shall be according to
Article 420 — 09(e)(2).
353.11 Surface Test. The finished surface of the base course shall be within
the tolerance of the following surface trueness test. The base course will be tested for trueness in each wheel path at the expiration of the required curing or protection period. The surface will be tested by means of a 16 ft (5 m) straightedge placed parallel to the centerline of the base course, parallel to the grade line, and touching the surface. Surface variations which exceed 3/8 in. (10 mm) will be marked and shall be removed with pavement surface grinding equipment. Determination of base course thickness will be made after the removal of high spots.
353.12 Tolerance in Thickness. The thickness of 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. 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. The procedure described in Article 407.10(b) shall be followed, except the option of correcting deficient pavement with additional lift(s) shall not apply.
353.13 Method of Measurement. This work will be measured for payment as
follows.
a.Contract Quantities. The requirements for the use of contract quantities shall conform to Article 202.07(a).
b.Measured Quantities. Portland cement concrete base course will be measured in place and the area computed in square yards (square meters). The width shall be as shown on the plans or as directed by the Engineer. Reinforcement bars will be measured in pounds (kilograms) according to
Article 508 — 10. Tie bars will be measured according to Article 508.10.
HMA plugs at railroad grade crossings will be measured for payment in tons (metric tons) according to Article 406.13. 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.
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 187–190 of 1,217. View official source ↗