Which term is defined by including permeable and impermeable voids to determine the true volume of solids?

Which term is defined by including permeable and impermeable voids to determine the true volume of solids?

• A. Absolute Specific Gravity
• B. Apparent or Mass Specific Gravity
• C. Weathering Resistance
• D. Thermal Capacity

Answer: (B)

Apparent specific gravity is the ratio that uses the total volume the material occupies, including both permeable open pores and impermeable voids. When you determine it, you’re effectively considering the bulk volume of the sample, not just the solid material. That’s why it reflects the true volume that the solid plus its voids occupies, which makes the apparent (or mass) specific gravity smaller than the true specific gravity that ignores voids. This concept is especially important for porous materials and aggregates, where voids contribute to the overall volume and influence behavior in concrete. The other terms don’t fit because absolute (true) specific gravity uses only the volume of solid material, excluding pores; weathering resistance and thermal capacity describe durability and heat storage, not how we account for voids in volume for density calculations.

Apparent specific gravity is the ratio that uses the total volume the material occupies, including both permeable open pores and impermeable voids. When you determine it, you’re effectively considering the bulk volume of the sample, not just the solid material. That’s why it reflects the true volume that the solid plus its voids occupies, which makes the apparent (or mass) specific gravity smaller than the true specific gravity that ignores voids. This concept is especially important for porous materials and aggregates, where voids contribute to the overall volume and influence behavior in concrete.

The other terms don’t fit because absolute (true) specific gravity uses only the volume of solid material, excluding pores; weathering resistance and thermal capacity describe durability and heat storage, not how we account for voids in volume for density calculations.