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<br />304.06 <br />SECTION 300 <br />BASES <br />SECTION 304 <br />AGGREGATE BASE COURSE <br />DESCRIPTION <br />304.01 This work consists of furnishing and placing one or more courses of <br />aggregate and additives, if required, on a prepazed subgrade. <br />MATERIALS <br />304.02 Aggregate. The aggregates shall meet the requirements of subsection <br />703.03. <br />Acceptance will be based on random samples taken from each lift. <br />304.03 Commercial Mineral Fillers. Portland cement shall conform to <br />subsection 701.01. Hydrated lime shall conform [o subsection 712.03. <br />CONSTRUCTION REQUIREMENTS <br />304.04 Placing. If the required compacted depth of [he aggregate base course <br />• exceeds 6 inches, i[ shall be constructed in two or more layers of approximately equal <br />thickness. The maximum compacted thickness of any one layer shall not exceed 6 <br />inches. When vibratory or other approved types of special compacting equipment are <br />used, [he compacted depth of a single layer may be increased [0 8 inches upon <br />request, provided that specified density is achieved and written approval is given. <br />304.05 Mixing. The Contractor shall mix [he aggregate by methods that insure a <br />thorough and homogenous mixture. <br />304.06 Shaping and Compaction. Compaction of each layer shall continue until a <br />density of not less than 95 percent of the maximum density determined in accordance <br />with AASHTO T 180 has been achieved. The surface of each layer shall be maintained <br />during the compaction operations so-that a uniform texture is produced and the <br />aggregates are firmly keyed. Water shall be uniformly applied during compaction in <br />[he quantity necessary for proper consolidation. <br />The surface of the base course will be tested with a 10 foot straightedge, or other <br />approved device. The surface shall be tested prior to the application of any primer or <br />pavement. The variation of the surface from the testing edge of the straightedge <br />between any two contacts with the surface shall no[ exceed'/. inch. All irregularities <br />exceeding the specified tolerance shall be corrected to the satisfaction of the <br />Engineer at no additional cost to the Department. <br />• <br />221 <br /> <br />f <br />