309.01 Description. This item shall consist of constructing a
course of Portland cement concrete base, with or wi thout reinforcement as specified, on a prepared surface a ccording to these specifications, in reasonably close conformity with the established lines, grades, and typical cross sections shown on the plans or established by the Engineer.
309.02 Proportions. The proportions of materials shall comply
with Section 501 for paving concrete or Section 802 for Class A or Class S concrete. The Contractor shall prepare a m ix design according to Subsection 501.03 or Subsection 802.05 as appropriate.
309.03 Materials. The material requirements shall be according
to Section 501. Fly ash, if used, shall be accordi ng to Section 501.
309.04 Construction Requirements. Construction requirements
shall comply with Section 501 with the following ex ceptions:
a.No joints shall be required in Portland Cement Con crete Base other than construction joints. 224 (b) The surface shall be given a Class 1, Ordinary Sur face finish.
c.Surface evenness testing of Subsection 501.05(m) s hall not be required. However, surface tolerances shall be ¼" (6 mm) in 10' (3 m).
d.The pavement shall not be opened to traffic until a minimum compressive strength of 2100 psi (15 MPa) is obtain ed.
309.05 Tolerance in Base Thickness. The tolerance in base
thickness shall be according to Subsections 501.10 and 501.14. No thickness cores will be taken on sections less than 30' (10 m) in length or less than full lane width.
309.06 Quality Control and Acceptance. Quality control and
acceptance sampling and testing shall be according to Subsection 501.04, except that compressive strength will be de termined by cylinders obtained according to AASHTO T 23 and tha t coring will not be required to determine pavement thickness. T hickness will be determined by sounding after the fresh concrete has been struck off.
309.07 Method of Measurement. (a) Portland Cement Concrete
Base will be measured by the square yard (square me ter) and adjusted according to Subsections 501.04, 501.10 an d 501.14.
b.Reinforcing steel, when specified, will be measured according to Section 502.
309.08 Basis of Payment. Work completed and accepted and
measured as provided above will be paid for as foll ows:
a.Portland Cement Concrete Base will be paid for at the contract unit price bid per square yard (square met er) for Portland Cement Concrete Base of the thickness specified, wh ich price shall be full compensation for preparing the subgrade and shaping the shoulders, unless otherwise specified; for furnishi ng, transporting, and placing materials; for preparing and processing materials; for mixing, spreading, vibrating, finishing, and curing ; for performing mix designs and quality control and acceptance samp ling and testing; and for all labor, equipment, tools, and i ncidentals necessary to complete the work.
b.Reinforcing steel, when specified, will be paid for according to Section 502. 225 Payment will be made under: Pay Item Pay Unit Portland Cement Concrete Base Square Yard (__" [___mm] Uniform Thickness) (Square Meter)
Source: , Edition.