Biennial Report of the State Highway Commissioner Volume 4

Biennial Report of the State Highway Commissioner Volume 4

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: brought from other place along the line of work. Rolling Sub-grade.--After the shoulders and macadam bed have beei formed as above described the whole roadway shall be rolled until n more compacting is possible. The hollows developed by this rolling shall be filled with suitable material under the direction of the officer! in charge, and the roadway again rolled, and left in solid and firm condi tion, everywhere parallel to the finished roadway, the macadam bed be ing six inches below the finished grade and having the same crown. In deep, mealy sand, where rolling is impracticable when sub-grade is shaped, marsh hay, rotten straw or fine brush shall be laid on the sub0 0 grade to prevent the first course from mixing with the sand. First Course of Macadam.--To secure the product in sizes to comply with these specifications the crusher should be equipped with a revolving screen not less than nine feet long and thirty inches in diameter0 0 having perforations as follows: First section, three-quarter inch holes; second section, two00inch holes; third section, three-inch holes. Any stones not small enough to pass through the three-inch holes shall be returned to the crusher and recrushed. After the road has been graded and rolled in the manner above described, a layer of crushed stone shall be spread on the prepared bed to such uniform thickness as to be not less than three and one-half inches deep after thorough rolling, four and one00half inches deep loose measure. The stone for this course may be a suitable grade of crushe.. limestone, cobbles or trap rock, and shall consist only of that part of the crusher product passing over the three00quarter inch section and through the three inch section of the crusher screen. This stone shall more

Product details

  • Paperback
  • 189 x 246 x 2mm | 82g
  • United States
  • English
  • black & white illustrations
  • 1236906276
  • 9781236906274