Ancient-style Blue Bricks

     The blue bricks are a type of烧结砖, with the main raw material for ancient blue bricks being clay. After the clay is mixed with water, it is extruded into shape, then fired in a kiln at approximately 1000 degrees and cooled with water to prevent the iron in the clay from being fully oxidized, thus enhancing its resistance to weathering and water. Testing shows that the ancient blue bricks have a compressive strength greater than 10 MPa and a water absorption rate less than 20%. The replicas of ancient blue bricks are made by mimicking the various styles of ancient blue bricks, following the same firing method, and using the same clay material as the ancient blue bricks, but with modern production techniques.