An Unusual Case of Surface Deterioration on a Concrete Bridge Deck


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Title: An Unusual Case of Surface Deterioration on a Concrete Bridge Deck

Author(s): John Ryell

Publication: Journal Proceedings

Volume: 62

Issue: 4

Appears on pages(s): 421-442

Keywords: Admixture, bleeding, bridge deck, curing, durability, flaking, pavement, research, set-retarding admixture.

Date: 4/1/1965

Set retarded concrete placed in a bridge deck and finished with conventional equipment exhibited a severe surface deterioration in the form of flaking several days after poving. Similar concrete placed in the approach slab on a granular subgrade did not flake. laboratory and field investigations showed that the flaking was due to the formation of a weak plane immediately below the surface of the concrete and was closely con-nected with the bleeding characteristics of the mix. The solution was found in reducing the bleeding rate of the concrete by a change in the type of set retarding admixture.