Practice Quiz

Civil Engineering PE

Category - Subsurface

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When classifying a soil using the Unified Soil Classification System, what is the percent sand of a given soil sample based on the following sieve analysis results?

Sieve: Percent Finer
# 4: 100
# 10: 64
# 20: 20
# 40: 18
# 60: 13
# 100: 11
# 200: 7
  1. 80%
  2. 93%
  3. 98%
  4. Not enough information provided
Explanation
Answer: B - Based on the provided sieve analysis results, the percent sand in this soil is assumed to be 93% when classifying a soil using the Unified Soil Classification System. The percentage of sand in a soil sample is the amount of soil captured by the #200 to #4 sieves. (In this example, the percentage of sand is 100% - 7% = 93%.) Gravel is captured in the #4 to 3” sieves. (In this example, the percentage of gravel is 0%.)
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