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Quiz-03-Summer10

# Quiz-03-Summer10 - = = Soil is sandy silt or M(and we...

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FLORIDA INTERNATIONAL UNIVERSITY Department of Civil and Environmental Engineering CEG-4011 Geotechnical Engineering – I Summer Term “C” - 2010 QUIZ No. 3 Name _____ _________ SOLUTIONS ________________________21 February 2010 European engineers plot their grain-size graphs from right-to-left, versus the way we plot them from left-to- right (just the same as how we write). Determine the following: (2 points) Find the coefficient of uniformity. (2 points) Find the coefficient of gradation. (2 points) Classify this soil. G(4%), S(28%), M(65%), C(3%) = 100%; D 60 =0.052 mm, D 30 = 0.025mm, D 10 = 0.01mm. ( 29 ( 29 ( 29 2 2 60 30 10 60 10 0.025 0.052 5.2 6 not well graded; 1.2 0.010 0.052 0.010 u c D D C C D D D = = = < =
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Unformatted text preview: = = Soil is sandy silt , or M (and we cannot do more without Atterberg Limits). (2 points) A soil has a musty odor, a liquid limit of 145% and a plastic limit of 55%. Classify this soil using USCS. See slide #14 of Lecture 12. The musty odor indicates an organic soil and it’s PI = LL – PL = 145% - 55% = 90%. Using the A-line equation tells us the threshold between (MH, OH) versus CH, PI = (0.73)(LL-20) = (0.73)(145-20) = (0.73)(125) = 91 > than our PI = 90 therefore OH . (2 points) What is the above soil’s classification according to AASHTO? See slide #26 of Lecture 12. The equivalent AASHTO of USCS OH is A-7-6 ....
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