In the refractory industry, there are many fine details. They usually go unnoticed but can affect the safe use and operation of the refractory lining.
How many millimeters will Grade A mullite bricks expand per meter?
For the increase of 3 to 5 mm per meter of Grade A mullite bricks, the following factors need to be considered.
- The actual size of the bricks. Although Class A bricks have smaller dimensional tolerances, there will still be some fluctuation in the size of each brick.
- The space between bricks. When laying bricks, a certain gap needs to be left between the bricks, usually 3-5mm. The size of the padding seam will also affect how many millimeters per meter it will rise.
- Laying process. The level of craftsmanship and method of laying the bricks will also affect how many millimeters per meter they expand. Based on the above factors, the specific value of how many millimeters per meter of expansion cannot be determined and needs to be measured and calculated based on the actual situation. Generally speaking, the value of how many millimeters per meter A-grade mullite bricks expand is around 3-5 millimeters.
How many millimeters will andalusite refractory bricks expand per meter?
Andalusite refractory bricks are a refractory material commonly used in high-temperature environments. How many millimeters per meter it expands depends on the following factors. 1. The actual size of the bricks. The dimensional tolerance of andalusite refractory bricks is small, but there will still be certain fluctuations in the size of each brick. 2. The space between bricks. When laying bricks, a certain gap needs to be left between the bricks, usually 3-5mm. The size of the padding seam will also affect how many millimeters per meter it will rise. 3. Laying process. The level of craftsmanship and method of laying the bricks will also affect how many millimeters per meter the rise will be. 4. Temperature changes. Since andalusite refractory bricks are mainly used in high-temperature environments. Therefore, during the temperature change process, the size of the bricks will change to a certain extent, resulting in a different value of millimeters per meter. Based on the above factors, the specific value of how many millimeters per meter of expansion cannot be determined and needs to be measured and calculated based on the actual situation. Under normal circumstances, the value of how many millimeters per meter the andalusite refractory bricks rise is around 5-10 millimeters.
The dimensions of Grade A mullite bricks are 15 cm high and 16 cm wide, and the mortar joint is 3 mm. How many mm will it expand?
Based on the above description, it can be calculated that the area of each grade A mullite brick is 15 cm × 16 cm = 240 square centimeters. If the stone bricks are laid with mortar joints of 3 mm, then the actual laying area of each stone brick is the original 240 square centimeters plus the mortar joints in two directions, that is, 15.3 mm × 16.3 mm = 249.39 square mm. If 100 stone bricks are laid in this way, the total area will be 24,000 square centimeters. According to the above calculation, the actual area of each stone brick is 249.39 square millimeters, so the actual area of 100 stone bricks is 249.39 square millimeters × 100 = 24939 square millimeters. The calculation formula for expansion is expansion amount = paving area × expansion coefficient. Referring to the above description, the expansion coefficient of Grade A mullite bricks is 0.6‰, which is 0.0006. Therefore, the expansion amount = 24939 square millimeters × 0.0006 = 14.94 millimeters, which is approximately equal to 15 millimeters. Therefore, when laying 100 pieces of Grade A mullite bricks, you need to leave about 15 mm of expansion space.
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