Engineering & Contracting Volume 58

Engineering & Contracting Volume 58

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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. 1922 edition. Excerpt: costs, would not only make easier the work of the highway departments in promoting and financing road construction but would also place a greater importance upon the work of the engineer."--From the August Report of the Nebraska State Department of Public Works. Township Road Expenditures In Iowa.--Based on reports from 1,359 townships out of the 1,606 in the State of Iowa, the average road expenditure in 1921 was $4,163 per township. pact.--A new portable road-impact machine has been received and is giving most satisfactory results in testing the series of road slabs placed earlier in the season. This series consists of 120 concrete slabs ranging from 4 to 10 in. in thickness and from lean to rich mixtures. Some of the slabs are reinforced and others have a 2-in. Topeka top. There are at least two slabs of each type of construction, one on a dry subgrade and another surrounded by ditches, which are kept flooded. Briefly the new machine, which is shown in the illustration, consists of a typical truck wheel with spring and variable load above it, which is raised and allowed to fall on the slab from any desired height by means of an electrically-driven cam. Recording devices measure the deceleration or rate at which the wheel is brought to rest after coming in contact with the slab, the deflection of the slab at a number of points on a line across the slab, settlement of the slab into the subgrade, permanent set of the slab and the maximum instantaneous fibre stress at the point where the blow is struck. On the first slab tested the various recording devices checked each other with surprising closeness. For a series of blows varying slightly in intensity curves for the fibre stress, deceleration, and deflection more

Product details

  • Paperback | 814 pages
  • 189 x 246 x 41mm | 1,424g
  • United States
  • English
  • black & white illustrations
  • 1236953630
  • 9781236953636