Refractory materials — typical use of refractory bricks in construction Refractory bricks are primarily used for which application?

Introduction / Context:
Refractories are ceramic materials engineered to withstand high temperatures, chemical attack, and thermal cycling. Selecting them correctly is pivotal for kilns, furnaces, and power plant boilers.

Given Data / Assumptions:

• Refractory bricks possess high softening temperature and low thermal conductivity relative to structural bricks.
• Applications involve sustained exposure to hot gases or flames.

Concept / Approach:
Ordinary masonry units cannot tolerate the thermal stress, slag attack, and spalling encountered in combustion zones. Firebricks and other refractories (silica, high-alumina, magnesia, chrome) are formulated to maintain integrity in these environments.

Step-by-Step Solution:

Verification / Alternative check:
Standards and manufacturer datasheets define refractoriness under load, porosity, and hot strength tailored for furnaces and combustion chambers.

Why Other Options Are Wrong:

• Retaining walls, columns, piers, partitions (A/B/C/E): typically use structural or architectural units; temperature exposure is ambient, not high heat.

Common Pitfalls:
Using ordinary clay bricks in fireplaces or furnaces leads to cracking and failure. Always verify chemical compatibility (acid/basic) with flue gases or slags.

Final Answer: