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Asbestos cement, genericized as fibro, fibrolite (short for "fibrous (or fibre) cement sheet"; but different from the natural mineral fibrolite), or AC sheet, is a composite building material consisting of cement and asbestos fibres pressed into thin rigid sheets and other shapes.
In time it became a generic term for other companies' similar asbestos-cement products, and later an even more generic term for a hard, fireproof composite material, fibre cement boards, typically used in wall construction. It can also be found in insulation, siding, roof gutters, and cement wallboard. The more prevalent transite found in wall ...
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 ...
The asbestos fibres are intimately bound to the cement matrix and were considered to be immobilized in the cement and therefore less prone to be released in the environment, suspended in the air, and inhaled in the lung than in other materials or applications, such as thermal insulation or flocking, in which loose asbestos fibres were used.
Front cover of a brochure for Hatscheks Eternit Schiefer (asbestos cement roof tiles) Fibre-reinforced cement products were invented in the late 19th century by the Austrian Ludwig Hatschek. Principally he mixed 90% Portland cement and 10% asbestos fibres with water and ran it through a cardboard machine.
The concrete was used from the 1950s until the mid-1990s, with the Institute of Structural Engineers saying it will only need to be replaced if it is considered to be of poor condition and at high ...
In situ S/S, accounting for 20% of S/S projects from 1982–2005, is used to mix binding agents into the contaminated material while remaining on the site. Outside benefits of in situ mixing include conserving transportation costs, no landfill usage, and lesser risk to surrounding communities to be exposed to the hazardous materials while in ...
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.