Influence of Water Addition on Properties of low cement castable refractory

Low-cement castables have certain requirements on the construction site, and the change of water addition affects the flexural strength and compressive strength of low-cement castables. The increase in the amount of water added directly affects the uniformity of the castable. When the amount of water added exceeds the addition regulations, the segregation of the castable particles will be particularly obvious.

 
The amount of water added affects the bulk density of the low-cement castable. With the continuous increase of the amount of water added, the bulk density of the low-cement castable will gradually decrease.
The amount of water added directly affects the flexural strength of low cement castable refractory. The flexural strength of low-cement castables decreases with the increase of water content. When the amount of water added was increased by 1.5%, the flexural strength at room temperature decreased by 10%, and the flexural strength at high temperature decreased by 12%. If you continue to increase the amount of water, the flexural strength of the castable will decrease even more.
The amount of water added directly affects the compressive strength of low-cement castables. With the increase of water addition, the compressive strength of low-cement castables will continue to decrease. On the contrary, the amount of water added will decrease, and the compressive strength of low-cement castables will continue to increase. 

In a word, the amount of water added has a direct effect on the bulk density, compressive strength and flexural strength of low cement castable refractory, and the flexural strength and compressive strength will decrease when the amount of water increases by 0.5%. If the amount of water added is more than 1.5%, and then continue to increase the amount of water, the castable is prone to segregation and stratification, and the flexural strength and compressive strength decrease more greatly.
Summary: The amount of water added has a very large effect on the properties of low cement castable refractory. When constructing low-cement castables, it is necessary to construct in accordance with the construction requirements provided by the castable manufacturer, and strictly control the amount of water added, otherwise it will not only affect the performance of the castable, but also affect the service life of the castable on the kiln.