Chapter 4 Supplement This supplement contains the examples that will be worked i

Question

Chapter 4 Supplement This supplement contains the examples that will be worked in class. If the work covered in this supplement is turned in with the chapter homework, up to 10 Participation Points may be earned 2. Classify the following fine soils having the following field observations: Sample #1 Sample #2: Dark brown Some odor Dilatency: slow to react (show water) Dry Strength: crumbles with very little effort Toughness: weak Light-brownish-grey No objectionable smell Dilatancy: no reaction Dry Strength: very hard to crumble Toughncss: tough to roll 3. Classify the following soils by the AASHTO classification system. Give the group index for each soil. | 96 Pass #200 Soil | % Pass #10 | 96 Pass #40 LL 28 Classification 90 86 42 92 90 85 74 56 28 68 48 71 32 12 18 13 56 48 27 31 35 30 48 19 45 35 4. Classify the following soil using both USCS and AASHTO: EVE ANALYSS US STANDARD SEVE SES Cu 10 Cz (or Cc)-1.11 Atterberg Limits for particles passing #40 sieve: LL: 45% PL: 23% AASHTO Group Index-13 USCS Classification: AASHTO Classification:

Explanation / Answer

2. Sample 1 is Organic Clay-OL, Sample 2 is Inorganic Clay-CL.

3. In this table Samples are classified as follows;

A. Since less thsn 35% of the particles pass through a no. 200 sieve, it is silty clayyey gravel and sand material. LL is less than 40 and PI is less than10 the soil falls in group A-2-4.

Its group can be calculated from the formula;

(F200-35) [0.02+0.005 (LL-40) ] + 0.01(F22-15) ( PI-10), thus is is calculated as;

(32-35) [0.02+0.005 (28-40) ] (32-15) (9-10)

= (-3)(0.014 ) (17) (-1)

=0.714

Therefore G.I is 0.714 taken to be 1

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