Performance of Poly-Carb, Inc. Flexogrid Bridge Overlay System, MLR-86-04, 2001

(2001) Performance of Poly-Carb, Inc. Flexogrid Bridge Overlay System, MLR-86-04, 2001. Transportation, Department of

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Abstract

Intrusion of deicing materials and surface water into concrete bridge decks is a main contributor in deck reinforcing steel corrosion and concrete delamination. Salt, spread on bridge decks to melt ice, dissolves in water and permeates voids in the concrete deck. When the chloride content of the concrete in contact with reinforcing steel reaches a high enough concentration, the steel oxidizes. In Iowa, the method used to reduce bridge deck chloride penetration is the application of a low slump dense concrete overlay after the completion of all Class A and Class B floor repairs. A possible alternative to the use of dense concrete overlays, developed by Poly-Carb, Inc., is the MARK-163 FLEXOGRID Overlay System. FLEXOGRID is a two component system of epoxy and urethane which is applied on a bridge deck to a minimum thickness of ¼ inch. An aggregate mixture of silica quartz and aluminum oxide is broadcast onto the epoxy at a prescribed rate to provide deck protection and superior friction properties. The material is mixed on site and applied to the deck in a series of lifts (usually two) until the desired overlay thickness has been attained.

Item Type: Departmental Report
Keywords: Aggregate mixtures, Bridge decks, Chloride content, Corrosion, Deicing, Deicing chemicals, Delamination, Overlays (Pavements), Reinforcement (Engineering)
Subjects: Transportation > Pavements
Transportation > Pavements > Concrete
Transportation
Transportation > Materials
Transportation > Materials > Gravel and aggregates
Transportation > Bridges and tunnels
Transportation > Maintenance and preservation
ID Code: 19940
Deposited By: Iowa DOT Library
Deposited On: 29 Jun 2015 16:13
Last Modified: 29 Jun 2015 16:13
URI: http://publications.iowa.gov/id/eprint/19940