High Molecular Weight Methacrylate Sealing of a Bridge Deck, HR-2031, Construction Report, 1988

(1988) High Molecular Weight Methacrylate Sealing of a Bridge Deck, HR-2031, Construction Report, 1988. Transportation, Department of

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Abstract

The Iowa Department of Transportation used a high molecular weight methacrylate (HMWM) resin to seal a 3,340 ft. x 64 ft. bridge deck in October 1986. The sealing was necessary to prevent deicing salt brine from entering a substantial number of transverse cracks that coincided with the epoxy coated top steel and unprotected bottom steel. HMWM resin is a three component product composed of a monomer, a curnene hydroperoxide initiator and a cobalt naphthenate promoter. The HMWM was applied with a dual spray bar system and flat-fan nozzles. Initiated monomer delivered through one spray bar was mixed in the air with promoted monomer from the other spray bar. The application rate averaged 0.956 gallons per 100 square feet for the tined textured driving lanes. Dry sand was broadcast on the surface at an average coverage of 0.58 lbs. per square yard to maintain friction. Coring showed that the H.MWM resin penetrated the cracks more than two inches deep. Testing of the treated deck yielded Friction Numbers averaging 33 with a treaded tire compared to 36 prior to treatment. An inspection soon after treatment found five leaky cracks in one of the 15 spans. One inspection during a steady rain showed no leakage, but leakage from numerous cracks occurred during a subsequent rain. A second HMWM application was made on two spans to determine if a double application would prevent leakage. This evaluation has not been completed.

Item Type: Departmental Report
Keywords: Bridge decks, Friction, Inspection, Leakage, Sealing (Technology), Transverse cracking
Subjects: Transportation
Transportation > Bridges and tunnels
Transportation > Research
Transportation > Research > Concrete
Transportation > Design and Construction
Transportation > Maintenance and preservation
ID Code: 22012
Deposited By: Iowa DOT Library
Deposited On: 02 May 2016 16:17
Last Modified: 02 May 2016 16:17
URI: http://publications.iowa.gov/id/eprint/22012