Refractory mortar and its characteristics
Refractory mortar is a mortar that is used as a binder for laying refractory bricks in various industrial furnaces. In other words, these mortars are used in arranging bricks, creating a neutral layer between each type of brick, preventing corrosion and slag invasion, etc. Refractory mortars are divided into two groups: mortars that harden in heat (self-heating) and mortars that harden in air (self-air)..
Technical specifications of ready-to-use refractory mortar
Ready-to-use, air-tight mortar is a combination of ceramic materials with appropriate granularity and water-based mineral binders, specially formulated for insulating bricks. Insulation bricks have a high absorption rate due to their high porosity, therefore their porcelain fireproofing is done with the usual two-component mortar with many problems. Due to its special and unique formulation, ready-to-use mortar provides proper strength after drying and curing, while increasing the working time. Meanwhile, this mortar is also used for heavy and dense refractory bricks.
Preparation of refractory mortar
Before using the mortar, it is necessary to mix it for a few minutes with a suitable mixer, until the mortar reaches a creamy state. The concentration of this mortar is formulated for use by troweling method. If it is intended to be used by immersion method, it is necessary to add a percentage of water to its composition and mix it again. When mixing mortar, it should be noted that the mixer and containers used are completely clean and free of any contamination. It is necessary to remember to close the lid of the corresponding container and seal it completely to prevent water evaporation.
Also, in special cases, it is possible to need thicker or thinner mortar or mortar with special analysis (for example, phosphate mortar, alumina mortar, silicon mortar, etc.).
Tips about refractory mortar
The conditions that mortars deal with are more difficult and therefore require carefully adjusted properties. This mortar must be workable and trowelable.
A refractory brick mortar with good performance and excellent water retention, in a range of applications, can be used for masonry joints and screeds such as surface coating of walls or for repair.
If strong joints are required, the refractory mortar must be sufficiently heated to form a strong ceramic bond, but the refractory properties of the mortar must be high enough to resist melting or flowing from the joints at high temperatures.
The difference between refractory cement and refractory mortar
The biggest difference between cement and refractory mortar is that refractory mortar is used for refractory bricks (mixed with water or other liquids). Hydraulic refractory mortar is a combination of cement and special engineered aggregates and gives the mortar unique thermal and temperature characteristics for high temperature applications such as chimneys, furnaces, grills and pizza ovens.
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