đ Key Concepts
⢠Refractory materials are designed to withstand very high temperatures, such as in boilers, furnaces, and incinerators
⢠Think about what happens to joints and individual bricks/tiles when they expand and contract under intense heat
⢠The difference between sealing joints and protecting against mechanical/thermal stress
đ Think About
⢠Ask yourself: in a highâtemperature furnace or boiler, what is the most critical performance requirement for the mortar between refractory bricks? Is it more about preventing leaks, or about surviving heat and movement?
⢠Consider how individual refractory bricks or tiles might crack or spall if the mortar were too rigid. What function of the mortar helps prevent concentrated stresses on each piece?
⢠Look at each option and decide: which describe possible side benefits, and which describe the key design function in a highâheat, refractory application?
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Before You Answer
⢠Verify what ârefractoryâ specifically refers to (highâtemperature, heatâresistant applications, not ordinary building work)
⢠Check which choice best addresses thermal expansion, mechanical support, and stress distribution under heat, rather than just simple sealing
⢠Confirm whether all listed uses are truly primary purposes in a furnace/boiler context, or whether some are just incidental or secondary effects