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Moisture Cured Polyurethane Saves the Day

Moisture Cured Polyurethane Saves the Day
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This paper describes the recoating of the interior primary and secondary structural steel of an atmospherically exposed building that houses a solid waste transfer station. The basic chemistry and the benefits of moisture cured polyurethane coatings in cold and humid climates are discussed.

Product Number: 41208-442-SG
Author: Mike Oriol
Publication Date: 2008
Industry: Coatings
$0.00
$20.00
$20.00

This paper describes the recoating of the interior primary and secondary structural steel of an atmospherically exposed building that houses a solid waste transfer station. The basic chemistry and the benefits of moisture cured polyurethane coatings in cold and humid climates are discussed.

This paper describes the recoating of the interior primary and secondary structural steel of an atmospherically exposed building that houses a solid waste transfer station. The basic chemistry and the benefits of moisture cured polyurethane coatings in cold and humid climates are discussed.

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Effectiveness of Epoxy and Moisture-Cure Polyurethane Coatings in Corrosion Mitigation of Embedded Rebar- an Experimental Study

Product Number: 51320-14405-SG
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Chloride induced corrosion is the prime reason for the degradation of embedded rebar in reinforced concrete marine structures. The present study experimentally investigates the effectiveness of traditional two-component epoxy (EPX), and moisture-cure polyurethane coatings (MC) applied on the concrete surface in reducing the rate of chloride ingression compared to the conventional concrete with and without mineral admixtures like fly ash and GGBS. Coatings used in the present study are characterized by XRD, EDAX, FEG-SEM, water uptake, adhesion strength and contact angle tests. Rapid chloride migration tests (RCMT) were conducted on concrete with and without coatings. Resistivity offered against the chloride migration monitored during the RCMT test indicated that concrete with MC shown higher resistivity in the initial period and continued to decrease over the test duration at a faster rate, unlike EPX. The non-steady-state migration coefficients of the concrete cured for 28days and coated with MC and EPX coatings were found to be nearly 22% and 48% of that of concrete with SCM cured for 84days respectively. The study is further extended to monitor the corrosion of rebar embedded in coated concrete subjected to corrosion acceleration until the first crack appeared on an uncoated specimen. Variation in current flow, half-cell potentials recorded during the acceleration test and actual mass loss of embedded rebar estimated by gravimetric analysis are presented in this paper. 
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