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Soundness and specific heat capacity

Short answer

Soundness is resistance to volume change, cracking or expansion after setting, tested by Le Chatelier and autoclave tests for cement and sulphate tests for aggregate. Specific heat capacity is the heat required to raise unit mass by one degree, in J/(kg·K), important for thermal storage.

Define soundness and specific heat capacity as properties of materials.

Soundness

Soundness is the ability of a material (mainly cement, lime or aggregate) to resist volume change, cracking or expansion after setting. Unsound cement expands because of free lime or magnesia. For cement, soundness is tested by the Le Chatelier and autoclave tests; for aggregate, by the sodium or magnesium sulphate soundness test.

Specific heat capacity

Specific heat capacity is the quantity of heat required to raise the temperature of unit mass of a material by one degree. Its unit is J/(kg·K).

c=Qm ΔTc = \frac{Q}{m\,\Delta T}

Materials with high heat capacity (water, and massive concrete or brick walls) heat up and cool down slowly, so they are good for thermal storage.

✓ Answer checked by Claude Opus 5.5 (high effort)

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