Maintenance cycle for refractory castables before transportation
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Question: Lightweight refractory castables have been used inside the furnace, and it is planned to carry out furnace drying and curing after installation. What kind of curing is required for these lightweight refractory castables before transportation, and how long does the curing period take? ? Thank you! ! !
According to the specifications, water should be sprayed on the cast material within 24 hours after pouring, and it must not be moved within 72 hours. If transportation is necessary, it is advisable to allow at least 5–7 days of natural curing based on experience
The mold can be removed only after the surface of the material to be poured has hardened and its strength reaches over 70%. The curing time is determined based on the type of refractory material, the requirements of the construction design, as well as the strength requirements of the refractory material manufacturers. After the formwork is removed, the cast structure should be inspected promptly; any quality issues such as honeycombing, peeling, or holes must be addressed and repaired immediately. When the problem is severe, the defective area should be chiseled out, filled with casting material of the same grade, tamped firmly, and then further cured. The curing and baking times are designed based on the type of castable, the casting thickness, and on-site temperature conditions. During baking, strictly follow the temperature rise curve; it is strictly prohibited to increase the temperature too rapidly. It is necessary to ensure that moisture is removed slowly, in order to prevent the refractory material from cracking due to too fast temperature rise.
The information provided upstairs is very good. Could you provide the criteria for selecting the casting material?