Bulletin - American Railway Engineering Association Volume 113-121

Bulletin - American Railway Engineering Association Volume 113-121

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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. 1909 edition. Excerpt: ...Railway): --(1) The structures covered with concrete roofs were car house, having roof areas varying from 2V2 to nearly 4 acres each in extent. (2) The roofs were intended to shed rainwater and a watertight roof was not an absolute necessity; therefore, no waterproofing whatever was used. (3) The roof slabs were of reinforced concrete of 1-2-4 mix. No stones larger than-in. in size were used, and the mixture was made rather wet. All reinforcement consisted of corrugated bars. (4) and (5) No waterproofing was applied. (6) The first two buildings erected were covered with a roof reinforced as per Fig. 1. It will be noted that the top reinforcing bars all stopped at the quarter-point, also that two of the four bars supporting the top bars were located at the extreme ends of top bars. In addition to the top and bottom reinforcing bars designed to resist the negative and positive bending J-in. square bars, 12 in. on centers, crossed the bottom bars at right angles and rested directly upon them. These bars were designed to resist the stresses due to shrinkage and temperature in this direction. (a) One of the roofs constructed as per Fig. I is now about three years old. Estimated life at least fifty years. (b) A few months after completion, characteristic cracks developed on the top and closely following the ends of upper reinforcing rods. These cracks were noticed at ends of about 25 per cent of these rods. Only a few of these leaks permitted water to come through. The total roof area of over three acres is to-day practically watertight, excepting in about eight places. (c) The worst leaks are at points where cast-iron downspout headers are set into the slab. Only two leaks are noticeable at joints between the work of different days. We believe..show more

Product details

  • Paperback
  • 189 x 246 x 16mm | 535g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236805267
  • 9781236805263