Friends who often follow this website have a certain understanding of fired bricks, but there is very little work applied to purchasing them. In response to the requirements of our customers, this article mainly introduces the main technical indicators of fired bricks:
1. Permeability of fired bricks: permeability coefficient ≥ 0.8mm/s;
2. Fired brick strength: The strength grade should be MU30, ≥ 30 megapascals, and the specific strength should comply with Table 3 of "Sintered Ordinary Bricks" GB5101-2003. Coefficient of variation δ ≤ 0.21; Strength standard value fk ≥ 22.0, coefficient of variation δ>0.21; The single small compressive strength value fmin is ≥ 25.0.
3. The weathering resistance of fired bricks meets the requirements of "Sintered Ordinary Bricks" GB5101-2003. In severely weathered areas, shale bricks have an average water absorption rate of 16% after 5 hours of boiling; The maximum value of a single block is 18%; The average saturation coefficient is 0.74; The maximum value for a single block is 0.77.
4. Lime burst. According to GB/T5101-1998, the damage size in the explosion area is 2mm smaller than that of the superior product.
5. Frosty. According to GB/T5101-1998, high-quality products are not allowed to have frosting, and qualified products are not allowed to have severe frosting, and are not allowed to contain undercooked bricks, crispy bricks, and spiral patterned bricks.
The above is a detailed introduction to the main technical indicators of fired bricks, hoping to be helpful for your future work.