Civil Engineering - Building Materials - Discussion
Discussion Forum : Building Materials - Section 1 (Q.No. 26)
26.
Which one of the following is acid resistant asbestos:
Discussion:
13 comments Page 2 of 2.
Madhu said:
6 years ago
Please explain about asbestos.
Sonam said:
4 years ago
It is used in fire-resistant and insulating materials.
Muhammad said:
2 weeks ago
The correct answer is All the above. All of the asbestos types listed—actinolite, amosite, anthophyllite, and crocidolite—belong to the Amphibole group of asbestos minerals, which are known for their general resistance to acids.
The distinction in acid resistance is primarily between the two main groups of asbestos:
1. Amphibole Asbestos (Acid Resistant) 1Includes: Actinolite, Amosite (brown asbestos), Anthophyllite, Crocidolite (blue asbestos), and Tremolite.
Structure: Amphiboles have a chemical structure based on a double chain of silicate tetrahedra. This double-chain structure forms solid, straight, and needle-like fibres.
Resistance: The amphibole structure is very strong and durable.
Their external surfaces are often described as having the chemical resistance of quartz, making them highly resistant to chemical breakdown by acids (including the strong acids found in the human body, such as stomach acid). This chemical inertness was a valuable property in industrial applications involving corrosive chemicals.
2. Serpentine Asbestos (Non-Acid Resistant) Includes: Chrysotile (white asbestos).
Structure: Chrysotile is a sheet silicate that forms flexible, curly fibres composed of a rolled-up sheet structure.
Resistance: Chrysotile is a magnesium silicate, and the magnesium-containing layer on its surface (a brucite-like layer) is easily attacked by acids, including those in the body (macrophages or the stomach). This chemical dissolution means chrysotile has low resistance to acids but is highly resistant to alkalis.
Therefore, because all four options provided are types of Amphibole asbestos, they are all classified as acid-resistant.
The distinction in acid resistance is primarily between the two main groups of asbestos:
1. Amphibole Asbestos (Acid Resistant) 1Includes: Actinolite, Amosite (brown asbestos), Anthophyllite, Crocidolite (blue asbestos), and Tremolite.
Structure: Amphiboles have a chemical structure based on a double chain of silicate tetrahedra. This double-chain structure forms solid, straight, and needle-like fibres.
Resistance: The amphibole structure is very strong and durable.
Their external surfaces are often described as having the chemical resistance of quartz, making them highly resistant to chemical breakdown by acids (including the strong acids found in the human body, such as stomach acid). This chemical inertness was a valuable property in industrial applications involving corrosive chemicals.
2. Serpentine Asbestos (Non-Acid Resistant) Includes: Chrysotile (white asbestos).
Structure: Chrysotile is a sheet silicate that forms flexible, curly fibres composed of a rolled-up sheet structure.
Resistance: Chrysotile is a magnesium silicate, and the magnesium-containing layer on its surface (a brucite-like layer) is easily attacked by acids, including those in the body (macrophages or the stomach). This chemical dissolution means chrysotile has low resistance to acids but is highly resistant to alkalis.
Therefore, because all four options provided are types of Amphibole asbestos, they are all classified as acid-resistant.
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