Refractory mortar plays the role of bonding and jointing refractory bricks. The refractory bricks should be equipped with refractory mud of the same material, but the load softening starting point of the refractory mortar is lower than that of the refractory brick, because the refractory mud produces large volume shrinkage at high temperature. Therefore, quality requirements are more important.
There are two forms of expansion of refractory mud: one is that the refractory mud itself expands by heating at a lower temperature, and the liquid phase appears and begins to shrink after the temperature rises to a certain degree; the other is that the expanding agent reacts due to the crystal form change or at a higher temperature produce volume expansion.
Refractory mortar and refractory bricks bear the same load and high temperature, especially in refractory brick masonry of large kilns. Refractory mud load softening temperature is one of the indexes of high-temperature use performance of refractory mud, which can reflect the actual use characteristics of refractory mud, and can also directly judge the temperature range of high-temperature volume shrinkage of refractory mud under load.
During the construction of the kiln project, except for special parts, the high-temperature volume shrinkage mud is not acceptable. The refractory mud resists deformation under the dual action of high temperature and load, which is poor refractory mortar. Out of service. Therefore, the most important refractory mud is the load softening temperature.
Refractory mud is an important bonding joint material in the process of refractory bricks. The role of refractory mud is very important, even more important than refractory bricks. If the quality of refractory mortar is not close, it will seriously affect the service life of refractory bricks. In other words, the importance of refractory mud is higher than that of refractory bricks.
The role of refractory mud directly affects the life of refractory masonry. If the adhesion is not strong or the powder is too thick, it will also affect the use of refractory bricks. During construction, the amount of mud added to the refractory brick must be well controlled. If the amount of added water is too large, the mud will easily flow from the brick joint; if the amount of added water is too small, the mud will dry out and the brick cannot be bonded.
