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D4580-03 Standard Practice for Measuring Delaminations in Concrete Bridge
Decks by Sounding

Abstarct: This practice covers procedures for surveying concrete bridge
decks by sounding to determine delaminations in the concrete. It is not
intended that the procedures described herein are to be used on bridge decks
that have been overlaid with bituminous mixtures. The procedures may be used
on bridge decks that have been overlaid with portland cement concrete
mixtures; however, areas indicated to be delaminated may have a lack of bond
between the overlay and the underlying bridge deck (Note 1). Note 1 The
influence of variable field conditions such as traffic noise, vibration,
moisture content of the concrete, and the like, are not completely known and
additional investigation may be needed. It is generally agreed that the
practice should not be used on frozen concrete. 1.2 The following three
procedures are covered in this practice: 1.2.1 Procedure A,
Electro-Mechanical Sounding Device This procedure uses an electric powered
tapping device, sonic receiver, and recorder mounted on a cart. The cart is
pushed across the bridge deck and delaminations are recorded on the
recorder. 1.2.2 Procedure B, Chain Drag This procedure consists of dragging
a chain over the bridge deck surface. The detection of delaminations is
accomplished by the operator noting dull or hollow sounds. Tapping the
bridge deck surface with a steel rod or hammer may be substituted for the
chain drag. 1.2.3 Procedure C, Rotary Percussion This procedure consists of
rolling a dual-wheel, multi-toothed apparatus attached to an extension pole
over the bridge deck surface. The percussive force caused by the tapping
wheels will create either a dull or hollow sound indicating any
delamination. 1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the responsibility
of whoever uses this standard to consult and establish appropriate safety
and health practices and determine the applicability of regulatory
limitations prior to use.

James Cohen, PE
James Cohen Consulting, PC
http://expertpages.com/jccpc


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