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Castable, ramming material and other amorphous resistance material construction points

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Castable, ramming material and other amorphous resistance material construction points


Before construction, check the mixing and cleaning conditions of the mixing equipment, transportation tools, vibrating tools and parts to be poured; check the water-proof measures of the refractory bricks and insulation layer around the stencil; check the rust and anchorage of the equipment Parts, anchor brick form, size, arrangement, welding quality and expansion compensation measures for metal anchors; check the quality of the castables and whether the construction water meets the requirements. In addition, during the construction of castables, it is necessary to ensure that no power is cut off and construction is not interrupted.

Among them, the template for castable construction is made of a material that does not absorb water. If a wooden formwork is used, the waterproof coating should be applied to prevent the castable from losing water. After the water is lost, the fluidity of the castable is lowered, and it is difficult to discharge the bubbles and vibrate. The steel formwork should be coated with a release agent to prevent the formwork from sticking with the castable. When used repeatedly, the template should be cleaned first, then oiled, and then used.

2. Stirring

1 should be mixed with a forced mixer. The mixer should be cleaned beforehand and rinsed with water. Do not mix with lime, silt, Portland cement and other debris. If the phosphate-bound amorphous material is stirred, the equipment must be thoroughly cleaned before it can be used to mix the cement-bonded castable.

2 According to the size and construction of the mixer, the amount of mixing should not exceed 200kg. In the case of the specified water consumption, the mixing castable must be brought to a sufficient degree of fluidity.

3 Pour the components of the castable into the mixer, dry mix for 3 minutes, then add clean tap water. When adding water, first add 90% of the reference water content of the castable, and then slowly add the remaining water to make the fluidity of the slurry meet the requirements, and the wet mixing time should not be less than 5 minutes.

4 castables must be used in the whole package. The stirred castable should be poured quickly. It must be used within 30 minutes from the time of adding water. The wet material that has been initially condensed shall not be barely formed, and it may not be re-used with water and stirred again, and must be discarded.


3. Vibration

1 The model should be strict and prevent leakage. The pouring material poured into the mold frame should be layered and tempered by the vibrating rod as soon as possible. The thickness of each layer should not exceed 300mm, and the vibration spacing should be about 250mm. Do not repeat the vibration of the parts that have been tapped to avoid segregation.

2 When vibrating, avoid touching the anchor, and do not damage the insulation layer. The surface of the castable is flooded, and most of the bubbles are discharged, and the vibrating rod is slowly withdrawn.

3 pouring should be carried out continuously. Before the first layer of castable material is initially set, the construction of the latter layer of castable should be carried out in time. If the construction interval exceeds the initial setting time, it shall be treated according to the construction joint requirements.

4. Maintenance

1 For the cement-casting castable, immediately after the surface of the castable is dry, cover the exposed part of the air with plastic or straw bag. However, the chemically bonded castable does not need to cover the surface.

2 After the final setting, the template of the castable can be removed. However, the load-bearing plate must be removed after the strength reaches 70%.

3 The curing temperature of the refractory castable should be between 10 and 35 °C. If the temperature is too high, the hydration product will be converted to C3AH6, which may cause the strength to decrease; if the temperature is too low, the hardening will be delayed.

5. Special construction

During the summer construction, the castables should be stored in a cool place in advance, and the construction should be arranged as early as possible in the morning and evening. The water temperature and material temperature should be controlled below 30 °C. After pouring, cover and cover the water in time to cool down.

In winter construction, the castables should be pre-stored in a heated room and mixed with hot water to keep the temperature of the mixture above 10 °C and the lining temperature above 5 °C. If these conditions are not met, the working environment must be closed, winded, heated and insulated until it meets the construction requirements. During the hardening and curing period, the castables should not be frosted.


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