How Much Water To Add To Refractory Castables

Refractory castable construction is the key to ensuring the stability of high-temperature kilns, but during the construction of refractory castables, it needs to be mixed with water before it can be used, and the amount of water added affects the quality of the refractory castables. Not only that, the quality of water also affects the quality of construction. So how much water should be added to refractory castables?

For ordinary refractory castables, the amount of water added to refractory castables accounts for 7%-8% of the total mixing amount, and some are about 9%-10%. For lightweight castables, the amount of water added is generally 30%-38%, and there are certain differences in the amount of water added between different refractory castables. It should be noted that when adding water, it is necessary to ensure that the water is clean and pure drinking water, not sewage or water containing impurities, which will affect the construction quality of refractory castables.

The amount of water added affects the use of refractory castables. Too little water will lead to poor fluidity of refractory castables, fill molds, and affect construction quality and the integrity of castables; while too much water will reduce the strength and refractory performance of refractory castables, and increase the difficulty of drying and baking. If the drying is not in place, it is likely to cause cracks or peeling during use. Therefore, the amount of water added to refractory castables should be taken very seriously.

Due to the different proportions of different common refractory castables, the amount of water added should be strictly implemented according to the actual requirements of the manufacturer. Not only that, there are also differences in the amount of water added between different refractory castables, and in the actual construction process, environmental factors should also be taken into account. For example, there are differences in the rate of water evaporation during winter construction and summer construction, so there should also be certain differences in the amount of water added.

The amount of water added to refractory castables affects its performance and quality. We must strictly control the amount of water added and the quality of water during the construction process and strictly follow the construction specifications to ensure the quality of construction and the subsequent construction life of the kiln.