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During the construction process of steel fiber castables, attention should be paid to the following four key links: mixing, pouring, curing, and baking. Problems in any of these links will lead to product performance degradation or failure.
1. Mechanical mixing, equipment and tools: forced mixer, bucket scale, vibrator, tool shovel, trolley, etc.
2. Industrial water consumption: The amount of water added for steel fiber pouring should be controlled at 7-8%, and pure drinking water must be used.
3. Environmental requirements and control The temperature of the construction site must be between 10-25 degrees Celsius. If the temperature of the construction site is lower than 10 degrees Celsius, heating and insulation measures must be taken to complete the construction. If the temperature at the construction site is higher than 30 degrees Celsius, necessary cooling measures must be taken before construction can begin. Otherwise, the product will be difficult to construct or its performance will decrease, making it difficult to construct.
4. Mixing: First pour the bulk materials and small bags into the mixer and dry mix for 3-5 minutes to mix evenly. Add the specified amount of water, accurately weigh out the water required for each mixing, and pour in the mixed ingredients. of dry ingredients, stir thoroughly for no less than 1-3 minutes to make it have suitable fluidity.
5. Notes: Tools used during the construction process such as buckets, mixers, shovels, etc. must be cleaned in advance. Dirt, Portland cement, etc. are not allowed to stick to them. The water used for construction must be pure tap water. The amount of mixing each time should not be too large. It should be determined according to the type and model of the mixer. Be cautious about excessive water consumption during the construction process.
1. The working surface must be clean (no salt marks, no cement marks) and dry before pouring. The corroded parts of the kiln body must be polished clean and dried. When repairing the kiln, the original remaining castables must be removed.
2. Pouring time: The newly mixed castable should be poured quickly, usually within 20 minutes.
3. Pouring: Pour the mixed steel fiber castable into the mold, and insert a vibrating rod in time to vibrate. The vibration must be even. There are bubbles discharged from the surface to form a slurry.
4. Note: Castables that have lost fluidity or have solidified during the pouring process cannot be mixed with water. The vibrated castable should maintain a natural surface. It is not advisable to use tools to polish, let alone sprinkle cement powder on the surface to polish. After the construction is completed, that is, within 48 hours of construction, especially before the steel fiber refractory castables harden, it is strictly prohibited to knock or vibrate, otherwise cracks will occur and even complete damage will occur.
After the castable hardens, the surface of the construction body must be covered immediately with polyethylene film and covered with a wet straw bag. To prevent water evaporation and promote water activation and hardening, it is strictly prohibited to knock or vibrate. Depending on the hardening conditions, it can usually be demoulded in three days. Continue curing after demoulding, remove the plastic film and straw bag after three days, and allow the hardened body to dry naturally in the air for three to five days before baking.
Baking is the last key step in the use of steel fiber castables. Since the castables are relatively dense, it is forbidden to heat up too quickly during baking, otherwise, it will cause cracks in the castables or cause cracking accidents, which will affect the use of the castables.
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