When mixing low cement castable, if it is found that the material is uneven, it is necessary to take timely measures to adjust it to ensure the performance and construction quality of the castable. The following are the specific treatment methods:

I. Check the reasons

(1) Insufficient water addition:

If the amount of water added is insufficient, the castable may be too dry, resulting in uneven mixing.

Solution: gradually add a small amount of water, and continue to stir for 1 ~ 2 minutes after each addition until the material is uniform and reaches the appropriate fluidity.

(2) insufficient stirring time:

If the mixing time is too short, it may lead to uneven mixing of aggregate and powder.

Solution: extend the stirring time to ensure that the stirring time is not less than 5 minutes until the material is uniform.

(3) mixer failure:

Blades or mixing arms of the mixer may be damaged, resulting in uneven mixing.

Solution: Check the running state of the mixer to ensure that the mixer works normally. If a fault is found, repair or replace the mixer in time.

(4) Material caking:

The castable may agglomerate during transportation or storage, resulting in uneven mixing.

Solution: Before mixing, break the caked castable with hands or tools to ensure that the material is loose before mixing.

II. Adjust the stirring method

(1) increase the number of stirring:

If the material is still uneven after the first stirring, the stirred material can be poured out and poured into the blender for secondary stirring.

Operating steps:

Pour out the stirred materials and clean up the residue in the mixer.

Pour the materials into the blender again, and stir for a second time according to the original amount of water, and the stirring time is not less than 5 minutes.

(2) Adjust the water adding sequence:

If it is found that the uneven material is caused by improper water adding sequence, the water adding sequence can be adjusted.

Operating steps:

Dry-mix the castable for 1 minute to ensure that the aggregate and powder are evenly mixed.

Add water according to 70% of the reference water amount, and stir for 1 minute.

Observe the uniformity of the material, gradually add the remaining water, and stir for 1 minute after each addition until the material is uniform.

(3) Using manual stirring assistance:

If the mixer can't completely mix evenly, you can use tools (such as shovels or shovels) for manual mixing assistance during the mixing process.

Operating steps:

During the mixing process of the mixer, the mixer is suspended periodically, and materials are scooped up from the bottom and corners of the mixer with tools to ensure that the materials are fully mixed.

After each manual stirring, continue to start the mixer to stir for 1 minute, and repeat the operation until the materials are uniform.

III. Matters needing attention

(1) Avoid excessive water addition:

When adjusting the amount of water added, it is necessary to strictly control the amount of water added to avoid excessive water addition. Too much water will reduce the strength and durability of castable.

Suggestion: When adding water every time, only add a small amount of water and observe the effect after stirring evenly.

(2) avoid stirring for a long time:

Too long stirring time may lead to the failure of additives or excessive dispersion of particles in castable, which may affect the properties of castable.

Suggestion: the stirring time should be controlled within 5 ~ 10 minutes to ensure uniform materials.

(3) timely use:

The mixed castable should be used as soon as possible, and it must be used within 30 minutes from the beginning of adding water. If it is found that the material has been initially set, it shall not be mixed with water again.

Through the above methods, the problem of uneven materials in the mixing process of low cement castable can be effectively solved, and the construction quality of castable can be ensured.