Low cement castables materials are amorphous refractory materials that have been widely used in recent years. They mainly include aluminum silicate, magnesia, and silica. The cement content of low-cement castables is about 5%, and some are even reduced to 1%~2%. The purpose of reducing the cement dosage is to improve the fire resistance of the castables. The preparation process of low-cement refractory castables is strict, so there are many factors that affect its performance, so you should pay more attention when using it.
Low-cement castable is a high-tech refractory material developed on ordinary castables using rheology principles, closest packing theory and ultra-fine powder technology. It has the characteristics of low porosity, small pore size, high density, good volume stability, high strength and small amount of water added, and overcomes the significant decrease in strength of ordinary castables at 800 to 1200°C, and as the temperature increases By increasing the temperature, the thermal shock resistance of the furnace body can be more than doubled.
Factors affecting the performance of low cement castables
1. Influence of aggregates: Aggregates are an important component of low-cement castables and have a great impact on the performance of low-cement castables. The type, particle size, gradation, shape and surface state of aggregates will all affect the fluidity, compressive strength and durability of low cement castables.
2. The influence of fly ash: Fly ash is a commonly used admixture and has a certain impact on the performance of low-cement castables. An appropriate amount of fly ash can improve the fluidity of low-cement castables, reduce bleeding and enhance corrosion resistance. However, if the amount of fly ash is too much, the strength of low-cement castables will decrease.
3. The influence of slag: Slag is a commonly used active admixture that can improve the strength, durability and corrosion resistance of low-cement castables. However, if the amount of slag is too much, the fluidity of low cement castables will decrease.
4. The influence of admixtures: Admixtures can adjust and improve the performance of low-cement castables, such as enhancing fluidity, reducing bleeding, improving early strength performance, etc. However, the type and dosage of admixtures must be strictly controlled, otherwise it will adversely affect the performance of low-cement castables.
5. Influence of curing conditions: The curing conditions of this castables have a great impact on their performance. Appropriate curing temperature, humidity and time can ensure that low cement castables are fully hydrated and hardened, improving their strength and durability. If not properly maintained, the performance of this castables will decrease.
6. Influence of construction technology: Construction technology also has a great impact on the performance of cement castables. For example, pouring speed, vibration method, construction interval, etc. will all affect the density, uniformity and strength of low cement castables.
