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Asbestos cement is usually formed into flat or corrugated sheets or into pipes, but can be molded into any shape that can be formed using wet cement. In Europe, cement sheets came in a wide variety of shapes, while there was less variation in the US, due to labor and production costs.
The asbestos removal may take longer and cost more than the actual demolition. For example, the former seat of parliament of East Germany , the Palast der Republik , was stripped of most of its asbestos between 1998 and 2001, before it was finally demolished starting in 2006.
The mineral asbestos is subject to a wide range of laws and regulations that relate to its production and use, including mining, manufacturing, use and disposal. [1] [2] [3] Injuries attributed to asbestos have resulted in both workers' compensation claims and injury litigation.
Chrysotile is resistant to even strong bases (asbestos is thus stable in high pH pore water of Portland cement), but when the fibres are attacked by acids, the magnesium ions are selectively dissolved, leaving a silica skeleton. It is thermally stable up to around 550 °C (1,022 °F), at which temperature it starts to dehydrate.
Asbestos (/ æ s ˈ b ɛ s t ə s, æ z-,-t ɒ s / ass-BES-təs, az-, -toss) [1] is a group of naturally occurring, toxic, carcinogenic and fibrous silicate minerals.There are six types, all of which are composed of long and thin fibrous crystals, each fibre (particulate with length substantially greater than width) [2] being composed of many microscopic "fibrils" that can be released into ...
At the time, the company manufactured products out of asbestos cement sheet and other related building material. [6] By the middle of the twentieth century, James Hardie had become the largest manufacturer and distributor of building products, insulation, pipes and brake linings containing asbestos.
Higher concentrations of airborne asbestos fibers are reported in urban areas where there is more ACM (asbestos containing materials) and mechanisms of release (vehicles braking and weathering of asbestos cement materials); concentrations in the range of 1–20 ng/m 3 have been reported. Fibers longer than 5μm are rarely found in rural areas.
AIB is 16-35% asbestos, typically a blend of amosite and chrysotile, though crocidolite was also used in early boards. AIB is softer, more porous and less dense than asbestos cement . This, and the fact it typically contains a greater proportion of asbestos than the 10-15% of asbestos cement, [ 2 ] makes AIB far more friable and thus at greater ...
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