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,----- I I I I I I I I I I I I I I I I I I I 234-5 Acceptance of the Mixture. 234-5.1 General: Meet the requirements of 334-5 with the following modifications: 234-5.2 Acceptance Testing Exceptions: Density determinations will not be required on base widening strips 5 feet [1.5 m] or less in width, nor on the initial layer of base placed on a soil subgrade. In these situations compact the base in accordance with the rolling procedure (equipment and pattern) submitted as part of the Quality Control Plan and as approved by the Engineer. Use the permissible variations from longitudinal and transverse grades as specified in 200-7. The pay factor for LOTs where there are areas not requiring density testing will be prorated based on a pay factor of 1.00 for the tonnage of material in areas not requiring density testing and the actual pay factor for the tonnage of material in areas requiring density. 234-6 Plant, Methods and Equipment. Meet requirements of Section 320, with the following modifications: 234-6.1 Paving Equipment: A motor grader may be used to spread the first course of multiple course bases when the subgrade will not support the use of a mechanical spreader. The Engineer will not require mechanical spreading and finishing equipment for the construction of base widening strips less than 6 feet [1 .8 m] in width. 234-6.2 Compaction Equipment: In areas where standard rollers cannot be accommodated, vibratory rollers supplemented with trucks, motor graders, or other compaction equipment approved by the Engineer may be used. 234-7 Construction Requirements. 234-7.1 General: Meet the General Construction Requirements of Section 330, with the following modifications: 234-7.1.1 Temperature Limitations: Spread the mixture only when the air temperature is at least 400F [40C] and rising. Do not place the material on frozen subgrade. 234-7.1.2 Tack Coat: Unless otherwise authorized by the Engineer, apply a tack coat between successive layers of base material. 234-7.1.3 Thickness of Layers: Construct each course in layers not to exceed 3 inches [75 mm] compacted thickness. 234-8 Thickness Requirements. 234-8.1 General: When the Department pays for the pavement on a square yard [square meter] basis, the Engineer will determine the thickness of the asphalt base based upon the spread rate of the material. The minimum spread rate for the total thickness shall be established from the plan thickness in the following manner: 43.3 Ibs/sy multiplied by the maximum specific gravity of the mix (as indicated on the mix design) for everyone inch [9.28 kg/m2 multiplied by the specific gravity for every 10 mm] of desired thickness, or as determined by the Engineer. The weight of the mixture shall be determined as provided in 320-2.2 (including the provisions for automatic recordation system). The spread rate for each individual layer shall be established by the Engineer. The minimum layer spread rate shall be 43.3 Ibs/sy multiplied by the maximum specific gravity (Gmm) of the mix (as indicated on the mix design) for everyone inch [9.28 kg/m2 multiplied by the specific gravity for every 10 mm] of desired thickness. 234-8.2 Spread Rate Tolerance: Control the average spread rate on a daily basis to within :t 5 % of the target spread rate for the individual layer(s) established by the Engineer. March 2007 01000-45 03-4122.0