TWO-COURSE BONDED CONSTRUCTION AND OVERLAYS

Two-course construction has been suggested as an approach to preventing the spalling of concrete bridge decks. Under this procedure the deck is formed and concrete is placed to a level about 0.5 in. (13 mm) above the top mat of reinforcing steel. This first course is screeded, but no attempt is made to meet normal surface tolerances. When the first course has gained sufficient strength, a second course providing 2 in. (51 mm) of cofer over the steel is placed to serve as a riding surface. Great attention can be paid to the quality of the relatively small amount of top course concrete, in both its mix proportions and placement. The paper presents several advantages inherent in two-course construction, reviews the performance of similar concrete overlays commonly used in the maintenance of existing decks, and suggests materials for use in the important top course. /Author/

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  • Accession Number: 00131420
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 14 1976 12:00AM