According to the Bureau of Indian Standards, IS 12894:2002, clay and silt in sand for pulverized fuel-ash lime bricks should preferably be:

Explanation:

According to IS 12894:2002

• The clay and silt content in sand used for pulverized fuel-ash lime bricks should preferably be in the range of 0-5%.
• This helps ensure the proper bonding and workability of the bricks without excessive shrinkage or cracking.

 Additional InformationPulverized Fuel-Ash Lime Bricks (PFAL Bricks)

These bricks are made by using pulverized fuel ash (PFA), also known as fly ash, which is a by-product of coal combustion in power plants. The process involves mixing PFA with lime and sometimes sand to create durable building materials.

Key Components:

• Pulverized Fuel Ash (PFA): A fine ash generated from coal combustion. It's the primary ingredient in PFAL bricks.

• Lime: Acts as a binding agent to bind PFA particles and provide strength.

• Sand: Sometimes used in small quantities to adjust the texture and workability of the brick mix.