301
SECTIO N 301 – SUBBASE 301.0 1 DESCRIPTION . This work shall consist of furnishing and placing one or more courses of approved gravel, crushed gravel, dense graded crushed stone, or other proportioned material on a prepared surface or at other locations. 301.0 2 MATERIALS . Materials shall meet the requirements of the following subsections: Coarse Aggregate for Concrete ................................ ................................ .................. 704.02 Gravel for Subbase ................................ ................................ ................................ .....704.04 Crushed Gravel for Subbase ................................ ................................ ...................... 704.05 Dense Graded Crushed Stone for Subbase ................................ ................................ 704.06 Processed Glass Aggregate ................................ ................................ ........................ 704.20 Recycled Concrete Aggregate ................................ ................................ .................... 704.21 At the option of the Contractor, unless otherwise specified in the Contract, processed glass aggregate
requirements of Subsection 704.21 may be used to partially replace natural aggregate in materials specified to meet the requirements of Subsection 704.04 , Subsection 704.05 , or Subsection 704.06 . PGA subbase blends shall not contain more than 20% PGA by weight. RCA subbase blends shall not contain m ore than 25% RCA by weight. In no case shall PGA and RCA be combined in subbase. The final blend shall conform to the specified gradation for the subbase material. The blending process shall be complete to ensure that as thorough a distribution and as unif orm a mixture as practicable has been obtained. In -place blending of PGA with other materials will not be permitted. When specified for use on the project or as directed by the Engineer, RAP subbase shall include milled grindings which have been screened or crushed by the Contractor such that 100% pass the 1 -1/2 inch (37.5 mm) sieve prior to blending. The grindings shall be blended in equal proportions (50% by weight) with material meeting the requirements of fine graded crushed gravel for subbase as specified in Table