NCEES Civil PE Specification VII.B.: Soil Properties
Problem
A laboratory standard proctor compaction test was performed on a sample to achieve a relative compaction of 95%. The resulting sample laboratory dry density was found to be 118 pcf. Given a water content of 20%, determine the unit weight of the soil:
Select an Answer:
CORRECT 😃
INCORRECT 😟
% Students Correctly Answered:
46.9%
Solution
Answer: C) 135 pcf
Dry density achieved by proctor compaction test:
$$ \rho_{d_{lab}}=118\ pcf $$
Relative compaction:
$$ RC=0.95 $$
Relationship between dry density found by test and actual dry density:
