Florida DOT Concrete Batchman/Operator Practice Exam

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In calculating the specific gravity, what value is multiplied by SG to find Unit Weight?

45.5
62.4
27
100

The correct answer is: 62.4

The specific gravity (SG) of a material is a dimensionless quantity that is used to compare the density of the material to the density of water. To convert specific gravity to unit weight, it is necessary to multiply by the unit weight of water, which is commonly accepted to be 62.4 pounds per cubic foot in imperial units. By using this specific value, the conversion maintains consistency across measurements involving concrete and aggregates within the field of civil engineering. In this context, multiplying the specific gravity by 62.4 gives you the unit weight of the material in pounds per cubic foot, providing a crucial parameter for material design and quality control in concrete applications. Understanding this relationship is key for anyone involved in concrete batching and operations, as it affects the performance and durability of concrete mixtures.