156 TABLE 307.9.1 Adjustment of Contract Price for Gradation not Within Specifications Degree of Nonconformance Percent of Contract Price to be Reduced 1.0 to 3.0 2 3.1 to 5.0 5 5.1 to 8.0 8 8.1 to 12.0 12 12.1 to 16.0 16 Greater than 16 *
* The Division will make a special evaluation of the material and determine the appropriate action.
307.10PAY ITEMS :
ITEM DESCRIPTION UNIT 307001 -* Aggregate Base Course, Class “class” Cubic Yard 307005 -* Aggregate Base Course, “aggregate type”, Class “class” Ton
* Sequence number “aggregate type” shall be either stone and gravel, slag or steel slag “class” From Table 704.6 2 A and B
157 SECTION 311 OPEN GRADED FREE DRAINING BASE COURSE
311.1 -DESCRIPTION : This work shall consist of constructing a base course of coarse stabilized aggregate spread and compacted on a prepared surface in accordance with these specifications and in re asonably close conformance with the lines, grades, thickness, and typical cross sections as shown on the Plans or as established by the Engineer. It is the intent to allow the Contractor a choice between asphalt stabilizer and Portland cement stabilizer.
311.2 -MATERIALS : Depending on the alternative chosen, (asphalt or Portland cement) the materials shall conform to the requirements of the following subsections of Division 700.
MATERIAL SUBSECTION UNIT Aggregate* 703.1 , 703.2, 703.3, 703.4 AASHTO 57, 67, 357, or 467 Curing Material*** 707.10 Performance Graded Binders** 705.5 Standard grade for area Portland cement*** 701.1 Type 1 Water*** 715.7
* If river gravel is used, the crushed particle requirement shall be 100% two face fracture. ** Asphalt stabilized applications only. *** Portland cement applications only.
CONSTRUCTION METHODS
311.3 -GENERAL : General requirements shall comply with the applicable portion of 401.3 of the Specifications.
311.4 -COMPOSITION OF OPTIONAL STABILIZING MIXTURES : If the asphalt stabilized alternative is used, the asphalt cement shall be confined to 2.0%, plus or minus 0.5% by weight of the mix if Blast Furnace Slag i s used the asphalt cement may be increased. If the Portland cement stabilized alternative is chosen, the cement shall be Type 1 and shall have a minimum cement content of 150 ± 5 pounds per cubic yard. This base course shall be capable of withstanding co nstruction operations without showing any detrimental effects.
311.5 -TESTING : 311.5.1 -Quality Control Testing: Quality control is the responsibility of the Contractor as specified in subsection 106.1. The contractor shall design a quality control plan detailing the methods by which the quality program will be conducted. The Contractor shall conduct one test daily to determine mix properties in accordance with subsection 311.4. Frequency will be one test per day. Acceptance for gradation will be in accordance with section 703.4. If gravel is used for the coarse aggregate a crushed particle analysis, in accordance with