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<br />1 3.2 Section 300 -Bases ' <br />2 3.2.1 Section 304 -Aggregate Base Course ' <br />3 304.01 Description. This work consists of furnishing and placing one or more courses of <br />4 aggregate and additives, if required, on a prepared subgrade. <br />5 ' <br />6 Materials <br />7 304.02 Aggregate, The aggregates shall meet the requirements of subsection 703.03. ' <br />8 <br />9 Acceptance will be based on random samples taken from each lift. <br />10 ' <br />11 304.03 Commercial Mineral Fillers. Portland cement shall conform to subsection 701.01. <br />12 Hydrated lime shall conform to subsection 712.03. <br />13 ' <br />14 Construction Requirements <br />15 304.04 Placing. If the required compacted depth of the aggregate base course exceeds 6 <br /> <br />16 <br />inches, it shall be constructed in two or more layers of approximately equal thickness. The ' <br />17 maximum compacted thickness of any one layer shall not exceed 6 inches. When vibratory or <br />18 other approved types of special compacting equipment aze used, the compacted depth of a single ' <br />19 layer may be increased to 8 inches upon request, provided that specified density is achieved and <br />20 written approval is given. <br />21 , <br />22 304.05 Mixing. The Contractor shalt mix the aggregate by methods that insure a thorough and <br />23 homogenous mixture. <br />24 <br /> <br />25 <br />304.06 Shaping and Compaction. Compaction of each layer shall continue until a density , <br />26 of not less than 95 percent of the maximum density determined in accordance with AASHTO T <br />27 180 has been achieved. The surface of each layer shall be maintained during the compaction <br /> <br />28 <br />operations so that a uniform texture is produced and the aggregates are firmly keyed. Water shall ' <br />29 be uniformly applied during compaction in the quantity necessary for proper consolidation. <br />30 ' <br />31 The surface of the base course will be tested with a 10 foot straightedge, or other approved <br />32 device. The surface shall be tested prior to the applicatio^ of any primer or pavement. The <br />33 variation of the surface from the testing edge of the straightedge between any two contacts with ' <br />34 the surface shall not exceed Y< inch. All irregulazities exceeding the specified tolerance shall be <br />35 corrected to the satisfaction of the Engineer at no additional cost to the Department. <br />36 , <br />37 The above compaction and straightedge requirements shall not apply to shoulder gravel. <br />38 Compaction of shoulder gravel shall be accomplished by wheel rolling, as directed. <br />39 , <br />40 304.07 Method of Measurement. Aggregate base course will be measured by the ton, or by <br />41 the cubic yard compacted in place. <br />42 , <br /> <br /> , <br /> 3-20 <br /> G:\101\00100 OZW\Repons\KP\Techniwl Specifications.tloc FeEruery 3, 2006 <br /> <br />