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Civil Engineering PE

Category - Soil and Materials

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What is the dry unit weight of a 500 cubic meter (cm³) soil sample with a water weight of 100 grams (g) and a solids weight of 900 g? Assume the specific gravity of the sample is 2.65.

1.8 g/cm³
1.6 g/cm³
9 g/cm³
Not enough information provided

Explanation

Answer: A - The dry unit weight of a 500 cm³ soil sample with a water weight of 100 g and a solids weight of 900 g is 1.8 g/cm³.

Solution: Use the following equation to determine the dry unit weight, ɣ_d
ɣ_d = weight of solids / total volume

= W_s / V_T

given W_s = 900 g

V_T = 500 cm³

Therefore, ɣ_d = 900 / 500 cm³

= 1.8 g/cm³

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