Text-Book on Highway Engineering

Text-Book on Highway Engineering

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ...Portland cement, and certain other ingredients. Specifications. The essentials of Mr. Brodie's method have been incorporated in specifications adopted by the Road Board of England. Excerpts from these specifications have been quoted to some length: --"The thickness of the surface coating of pitch-grouted macadam when finished and consolidated by rolling should be 22 inches to 3 inches (except on very light traffic roads, when the thickness may be 2 inches) for single-pitch-grouting, and from 4 inches to 42 inches for the double-pitch-grouting hereafter described. "In the case of naturally hard subsoils, not materially softened by infiltration of surface water, the total thickness of the road crust, including foundation, if any, after consolidation by rolling of the new pitch-grouted surface, should not under ordinary circumstances be less than 6 inches, unless the subsoil is so hard as in itself to act as a good foundation, in which case the thickness of the road crust may be reduced to 4 inches. In the case of clay or other yielding subsoils the total thickness should not be less than 11 inches. "The finished surface should have a cross-fall of about 1 in 32. "If the crust is not sufficiently thick at the crown to enable this cross-fall to be obtained with a new coating of the thickness above mentioned, then the old surface should be left intact and unscarified, and the thickness of the new pitch-grouted coating increased as far as may be necessary. "If the crust is of sufficient thickness for the purpose, the regulation of the cross-fall should be carried out by scarifying the surface and removing material from the crown to the sides previous to the application of the new coating. Material loosened by scarifying should...show more

Product details

  • Paperback | 232 pages
  • 189 x 246 x 12mm | 422g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236489969
  • 9781236489968