Asbestos in cement pipes and other building materials
In 1931, the United States and Canada first used asbestos-containing cement pipes, primarily in the western states. This concrete pipe is a mixture of Portland cement and asbestos fiber;
The participation of asbestos makes the pipeline very economical and corrosion-resistant (cement contains asbestos fibers, also known as transition). By 1953, the American Hydraulics Association had established standards for the use of asbestos-cement pipes in the national municipal water supply system.
The expected service life of these asbestos cement pipes is estimated to be about seventy years. Even today, asbestos-cement pipes are still part of the urban water supply system and these pipes have now reached the end of their service life. For the past three decades, most municipalities have been doing their best to remove and replace these pipes.
Although the asbestos in these pipes cannot be transmitted in the air and cause respiratory diseases, there are serious health consequences in communities where public water supplies still pass through asbestos-cement pipes. Local environmental problems may cause this type of pipeline to deteriorate, immersing asbestos fibers in the water. According to Canadian writer Barbara Robson, in Woodstock, New York became very bad, and in 1985, residence pipes were blocked with asbestos fibers. Her data indicates that there may be as many as 400,000 miles of asbestos-cement pipes in North America at one time.
Hazards of cement pipeline products
Workers in cement plants, the transformation of cement production is clearly at risk of inhaling asbestos production. Because they have worked with raw asbestos fibers, generally few breathing equipment will provide useful maintenance of asbestos from the air. Municipal sewer and water and asbestos cement pipe removal workers may have been exposed to asbestos fibers during the removal process, which can repair workers to repair or strengthen the existing transition pipe system. However, the primary danger of asbestos-cement pipes comes from the possibility of inhaling water contaminated with loose fibers. Human settlements with local transition tubes are used in water systems to increase the risk of developing peritoneal mesothelioma from asbestos material intake.