Sep. 21, 2020
Construction of mullite thermal insulation bricks
(1) The construction sequence and height of mullite thermal insulation bricks should be determined according to the masonry structure.
(2) Mullite thermal insulation bricks or light-weight refractory bricks should be laid by pulling threads and the brickwork joint should be staggered.
(3) Thick mud should be used for leveling of mullite thermal insulation bricks masonry. When there is embedded parts or special-shaped bricks, processed bricks should be used for leveling.
(4) When laying mullite thermal insulation bricks, the horizontal joint should be laid with ash, and the vertical joint should be squeezed with ash-raising method.
(5) It is not advisable to leave expansion joints in the mullite thermal insulation bricks, masonry, but when the movable ends of other equipment and components are facing the insulation refractory brick, and the expansion value is large, refractory fiber should be used within the expansion value range. Or other flexible insulation materials instead of insulation refractory bricks.
(6) When the expansion joints of refractory masonry, especially the straight expansion joints are facing the thermal insulation masonry, the mullite insulation bricks at this place must be replaced by refractory bricks. Generally, lay one layer of standard refractory in flat or erected way. Just cover the expansion joint is OK.
(7) Light mullite thermal insulation bricks should be manually squeezed for alignment. It is not suitable to strike with a mallet. For the dried thermal insulation masonry, no percussion, collision or other vibration is allowed.
(8) The width of brick joints of insulated masonry should be less than 5 mm. The mud grade and mix ratio must meet the design requirements, and the fullness of brick joints of the wet mullite insulation brick masonry shall not be less than 80%.