Cost effective bridge deck reconstruction in Kansas using high-density concrete overlays and asphalt membrane overlays : final report.
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2009-08-01
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Edition:Final report
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Abstract:In 1976 the Federal Highway Administration (FHWA) approved federal aid funding for experimental
installations of corrosion protection for reinforcing steel in existing concrete bridge decks. Sixteen of the sixty-nine
Kansas bridges with Cost Effective Overlays built between 1976 and 1987 were selected for ongoing
monitoring of delaminations, cracking and corrosion potential in the reinforcing bars. Fourteen bridges with
low water-cement ratio concrete overlays and two bridges with asphalt membrane protective systems were
monitored annually for the life of the overlays. Eight of the low water-cement ratio overlays were constructed
with high-cement-content Iowa System Overlays and six with lower-cement-content Kansas System Overlays.
The two asphalt membrane overlays were constructed with a non-woven polypropylene fabric membrane laid
onto asphalt cement and overlaid with hot-mix asphalt as a wearing surface. A comparison of service life with
initial cost of each type of overlay shows that correctly-installed asphalt membrane overlays may have been
the most cost effective, followed by the Kansas System concrete overlays.
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