Bridges painting

The effort to implement bridge corrosion control maintenance practices, which achieve regulatory requirements and cost efficiency, cannot be successful without the development of reliable task-based cost data for bridge painting tasks. These data depend on many factors such as local labor costs and structural factors such as accessibility to contractor costing rules. 

Uses Acrylic for mfg. of elastic top coats for crack-bridging paints, syn. 

Uses Acrylic for mfg. of elastic top coats for crack-bridging paints, syn. resin plasters, coatings on aerated concrete and primers, and for washproof finishing, coating, and lamination of textiles and non-wovens Features Free from film-forming aids, soivs., and plasticizers Properties Whitish liq. ammonia odor dilutable in water dens. 1.05-... 

Uses Mfg. of elastic top coats for crack-bridging paints, syn. resin plasters, coatings on aerated concrete, primers Trade Names Plextol DV 571... 

Example Bridge paint is often incorrectly applied or incorrectly chosen, causing many corrosion problems, especially in areas not open to direct human inspection underperforming corrosion-protective paint was part of the Minneapolis I-35W Bridge failure in 2007... 

Waste disposal is a national problem extending beyond the scope of bridge paints. Ihucedures developed by other industries may be appHcable to lead debris containment. The key to any approach is the economics of the processes. These numbers are often difficult to determine precisely because of the uncertain costs of hazardous waste disposal, and the larger uncertainties of whether a waste is hazardous to begin with. 

Other organics (detergents, ship and bridge paints, lubricants, herbicides, insecticides) Total... 

Putative Craters Caused by Non-Spreading Oil Drops Bridging Paint Films... 

Bridge Painting Company and Its President Plead Guilty to Federal Crimes Relating to the Dumping of Lead Waste, Business and Legal Reports, Feb. 15, 2002. 

Appleman, B.R., Bridge paint Removal, containment, and disposal. Report 175, National Cooperative Highway Research Program, Transportation Research Board, Washington DC, 1992. 

Bemecki, T.F., et al.. Issues impacting bridge painting An overview, FHWA/RD/ 94/098, U.S. Federal Highway Administration, National Technical Information Service, Springfield, 1995. 

J. D. Cosdow and R. D. Tipper, eds.. Marine Biodeterioration A.n Interdisciplinary Study Naval Institute Press, Annapolis, Md., 1984. C. H. Hare, The Painting of Steel Bridges, Reiclihold, New York, 1988. 

Thrner gauges may be used to determine scale thickness in situ. These are Wheatstone bridge circuit devices that have proved very useful for 40 years or so. As with chloral thermocouples, calibration may be difficult, and the level of magnetic iron content (magnetite) in the deposit may affect the readings. More modem electronic versions, similar to paint thickness testers, are now available. 

Thomas G. Spiro and William M. Stigliani. Chemistry of the Environment. New Jersey Prentice Hall, 1996. Source for lead-halide particles lead paint on school buses, highways, and bridges. 

Respiratory Effects. The only information located regarding respiratory effects in humans associated with lead exposure was a case report of a 41-year-old man who was exposed to lead for 6 years while removing old lead-based paint from a bridge. At the time of the initial assessment, his PbB level was 87 pg/dL, and he complained of mild dyspnea for the last 2-3 years. No abnormalities in respiratory function were seen at clinical examination, so it is not possible to conclude that his respiratory symptoms were related to exposure to lead (Pollock and Ibels 1986). 

Cardiovascular effects have been noted in occupationally exposed workers after exposure to high levels of lead following exposure durations of as short as 4 weeks. Construction workers (race not specified) using oxyacetylene torches to cut a metal bridge that had been painted with lead-based paint were reported to exhibit increases in heart rate and blood pressure after 4 weeks of exposure (Marino et al. 

Inhibition of ALAD and stimulation of ALAS result in increased levels of ALA in blood or plasma and in urine. For example, in a case report of a 53-year-old man with an 11-year exposure to lead from removing old lead-based paint from a bridge, a PbB level of 55 pg/dL was associated with elevated urinary ALA (Pollock and Ibels 1986). The results of the Meredith et al. (1978) study on lead workers and controls indicated an exponential relationship between PbB and blood ALA. Numerous studies reported direct correlations between PbB level and log urinary ALA in workers. Some of these studies indicated that correlations can be seen at PbB levels of <40 pg/dL (Lauwerys et al. 1974 Selander and Cramer 1970 Solliway et al. 1996), although the slope may be different (less steep) than at PbB levels of >40 pg/dL. In a study of 98 occupationally exposed subjects (51 pg/dL, mean PbB) and 85 matched controls (20.9 pg/dL. mean PbB) it was found that log ZPP and log ALA in urine correlated well with PbB levels (Gennart et al. 1992a). In the exposed group, the mean ZPP was 4 times higher than in the controls, whereas urinary ALA was increased 2-fold. 

Pollock CA, lbels LS. 1986. Lead intoxication in paint removal workers on the Sidney Harbour Bridge. Med JAust 145 635-639. 

The initial drying of currently applied alkyd paints is accomplished by evaporation of solvent (physical drying). Subsequently, the eventual curing of the alkyd paint is completed by the formation of a polymer network, which is mainly formed by chemical crosslinks (oxidative drying) but in some cases also physical interactions between the fatty acid side chains occur, such as crystallization or proton-bridge formation [129]. Efficient network formation is crucial in the formation of dry films with good mechanical properties. Due to the presence of unsaturated units in the investigated LOFA- and TOFA-PHA bin-... 

---