Low cement castable site construction water addition situation

Low cement castable is a castable with a small amount of high aluminum cement.

The amount of cement added is small, in order to reduce the calcium content to avoid affecting the later strength, and the current manufacturers on the market have basically canceled the high amount of high-aluminum cement as a binder. The castables used are basically low-cement castables. Low cement castable has less cement addition, low calcium content and low water addition in site construction. The castable added water is low and the water is discharged quickly, and the later use strength is high, thus increasing the service cycle of the castable.

But no matter any kind of product, laboratory and actual use, there will be a certain difference, the region, weather, technology are the key links of the difference, if the region is different weather temperature there will be a difference, the temperature is also an important issue to consider the construction of castable, there is the technical difference of the construction personnel, do not understand the situation of the construction, It will also affect the service life of castable.

Under normal circumstances, the amount of water added in the laboratory in actual use, there will be a deviation of about 2%, if the site according to the manufacturer's instructions to add water, still can not meet the flow of castable and initial coagulation requirements, first depends on the storage time of castable, if the storage time is more than 6 months, Then the binder separately equipped in the original ratio can be replaced before water is added to stir, and then construction is carried out. If it does not exceed the storage time, it depends on the temperature difference, if the temperature is too low, it is necessary to find a way to adjust the temperature between 5-30 degrees Celsius in the construction site.

If the time and temperature are available, and the amount of water added is more than 2%, it is necessary to consider whether the silica fume in the binder is damp, if the damp low cement castable will lack fluidity and need to be replaced before use.

In short, if the water addition of low cement castable site construction is greater than about 2%, it is necessary to solve the problem according to above situations.