Proceedings of the National Conference on Concrete Road Building Volume 1

Proceedings of the National Conference on Concrete Road Building Volume 1

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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. 1914 edition. Excerpt: ...of fine material for filling the voids; but for concrete pavement this fine material is not necessary and is liable to be detrimental. With reference to the strength, the joint committee on concrete and reinforced concrete in the last report requires 100 per cent sand or else, if it tests lower than this, that it shall have a larger percentage of cement with a limit of 70 per cent as the ratio between bank sand and the standard sand. For large construction we might frequently use sand somewhere between the limits of 100 per cent and 70 per cent; but for pavements, where the question of wear is under consideration, it is necessary to get a high standard if we wish to have good results. REPORT OF COMMITTEE IV PREPARATION AND TREATMENT OF SUB-GRADE FOR CONCRETE ROADS Chairman--Ira O. Baker Professor of Civil Engineering, University of Illinois, Urbana, Illinois A. R. Hirst A. N. Johnson State Highway Engineer, Madison, Wis. State Highway Engineer, Springfield, 111. IMPORTANCE OF PREPARATION OF SUB-GRADE The Committee calls attention to the fact that defects in the subgrade of a concrete road, or the improper preparation of it, may neutralize or nullify the care given to subsequent stages of the construction. The fundamental requirement of the subgrade is that it shall at all times be of uniform density, so that it will not settle unevenly and cause cracks in the concrete surface. Some engineers apparently believe that it is not necessary to take as much care in preparing the subgrade or foundation of a concrete pavement as of other forms of roads having an artificial surface, because the concrete slab will act as a bridge over any soft streak or low spot in the foundation; but the Committee is of the opinion that this is a mistake. The strength of a...show more

Product details

  • Paperback | 88 pages
  • 189 x 246 x 5mm | 172g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236551761
  • 9781236551764