be used on the remainder of the course represented by the cont strip.

Compaction of control strips shall commence immediately after t course has been placed to the specified thickness, and shall be contin ous and uniform over the entire surface. Compaction of the control str shall be continued until no discernible increase in density can be o tained by additional compactive effort.

Upon completion of the compaction, the mean density of the contr strip will be determined by averaging the results of ten nuclear densi tests taken at randomly selected sites within the control strip. T mean density of the control strip shall be the target density for th remainder of the course which it represents.

If the mean density of the control strip is less than 95 percent of th density of laboratory compacted specimens, as determined by testin procedures set out elsewhere in these specifications, the Engineer ma order the construction of another control strip.

A new control strip may also be ordered by the Engineer or re quested by the Contractor when:

(1) A change in the material or job-mix formula, is made.

(2) Ten days of production have been accepted without construc tion of a new control strip.

(3) There is reason to believe that a control strip density is no representative of the material being placed.

212.04 Control of Compaction. The specified course shall b placed, leveled, surface irregularities adjusted and thoroughly an uniformly compacted when the material is in the proper condition.

The density of the specified course will be tested on a sublot basis by means of a portable nuclear M/D test device in accordance with ASTM D-2950 or AASHTO T-238 (ASTM D-2922) as appropriate. Tests wil be run at random locations within sublots. Sublot size will be deter mined in accordance with the quantities set forth in Table 212.04.

If an individual test result falls below 96 percent of target density, as determined in accordance with subsection 212.03, the material represented by that test will be considered defective and the Contractor shall further compact the sublot. After further compaction, the original test site and one other randomly selected site within the sublot will be tested. The two test results will be included in the determination of the

mean density of the lot for acceptance purposes. The original test result will not be included.

212.05 Acceptance Sampling and Testing. Acceptance of each specified course will be made on a Lot basis as defined in the specification requirements thereto pertaining. The mean and range of the density tests for the lot will be calculated from the randomly selected sublot density control tests specified in the preceeding subsection. Acceptance of each Lot will be determined in accordance with the acceptance limits set forth in the specification requirements applicable to the particular course or material.

212.06 Method of Measurement. No measurement for payment will be made for this item.

212.07 Basis of Payment. Unless otherwise provided, the cost of constructing control strips will be considered incidental to the cost of the material for which a control strip is required. Payment for the material shall be full compensation for performing the work specified and the furnishing of all material, labor, tools, equipment and incidentals necessary to construct the density control strips. No payment will be made for any material used in the construction of unacceptable control strips.

Section 300.

BASE COURSES

Section 301.-PLANT-MIX BITUMINOUS BASE

COURSE

Description

301.01 This work shall consist of aggregate and bituminous material mixed in a central plant and spread and compacted on a prepared surface in accordance with these specifications and in reasonably close conformity with the lines, grades, thicknesses and typical cross sections shown on the plans or established by the Engineer.

Materials

301.02 Composition of Mixtures. The bituminous base shall be composed of a mixture of aggregate, filler and hydrated lime if required, and bituminous material. The several aggregate fractions shall be sized, uniformly graded and combined in such proportions that the resulting composite blend meets the job-mix formula and index of retained strength determined in accordance with subsection 401.02. The amount of bituminous material to be added will be shown in the special provisions as a percentage by weight of the total aggregate.

301.03 Materials. The type and grade of bituminous material will be specified in the contract.

Application temperatures shall conform to subsection 702.05 for the material specified.

Samples of aggregate, bituminous materials, and bituminous mixture for acceptance testing will be taken in accordance with Section 401. Materials shall conform to the requirements of the following subsections:

Construction Requirements

301.04 General. The construction requirements shall be as pr scribed in subsections 401.07 through 401.24, inclusive, of Sectio 401-Plant-Mix Bituminous Pavements-General.

301.05 Surface Tolerance. The requirements of subsection 401.2 shall apply except that the variation of the surface from the testin edge of the straight edge between any two contacts with the surfac shall, at no point, exceed 4 inch (6.35 mm).

Method of Measurement

301.06 Plant-mix bituminous base course will be measured as pre scribed in subsection 401.25.

Basis of Payment

301.07 The accepted quantities of plant-mix bituminous base course measured as provided above, will be paid for at the contract unit price per ton for the bituminous base mixture and, if included in the bid schedule as a pay item, per ton or gallon for the bituminous material complete in place, which prices and payment will be full compensation for the work of this section.