In accordance with TR 980, when curing a high-purity, low-cement castable for a high-temperature unit, which of the following sequences ensures minimum cracking risk?
A.
Steam curing for 48 hours followed by firing at 1500°F
B.
Air curing for 24 hours, followed by controlled heating ramp of 50°F/h up to 600°F
C.
Accelerated drying using forced air at 400°F for 12 hours
D.
Dryout using open flame burners after form removal
TR 980 outlines curing and dryout best practices for monolithic refractories. For high-purity low-cement castables, gradual heat-up is necessary to avoid thermal shock and cracking:
“A minimum 24-hour air cure at ambient temperature should be followed by a controlled dryout ramp not exceeding 50°F (28°C) per hour up to 600°F (316°C).”
— TR 980, Section 6.4.2
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