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How does granite’s thermal expansion compare to concrete?
Granite and concrete are widely used in construction, but their thermal expansion properties differ significantly. Granite, a natural igneous rock, has a lower coefficient of thermal expansion (CTE) compared to concrete. On average, granite expands at about 4.5–8.5 × 10⁻⁶ per °C, while concrete typically ranges from 10–14 × 10⁻⁶ per °C.
This difference arises from granite's dense crystalline structure, which resists heat-induced expansion better than concrete's porous composition. Concrete, made of cement, aggregates, and water, is more susceptible to temperature fluctuations, leading to higher expansion and potential cracking over time.
In practical terms, granite's stability makes it ideal for high-temperature environments like countertops and exterior cladding, whereas concrete requires expansion joints in large structures to accommodate thermal movement. Understanding these properties helps architects and engineers select the right material for durability and performance.
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