A 20 ft square footing width is subject to a contact pressure of 3000 lb/ft^2, t

Question

A 20 ft square footing width is subject to a contact pressure of 3000 lb/ft^2, the wet unit weight of the soil supporting the footing is estimated to be 100 lb/ft^3. Using the below figure, what is the minimum boring depth in feet? a. 10 b. 36 c. 50 d. None of the above ASTM D 698 uses a 10 pound hammer weight to do the compaction test. a. True b. False ASTM D 1557 uses a 5 pound hammer weight to do the compaction test. a. True b. False The water content is plotted after several liquid limit tests (LL results) where the soil closes 1/2"of the groove length is how many blows using the Casagrande device? a. 25 blows b. 35 blows c. 45 blows d. 55 blows The moisture content of soil is? a. volume of dirt that retains water b. The volume of water in dirt c. The percentage by weight of soil that retains water d. The percentage by weight of the water in soil

Explanation / Answer

10. False, ASTM D698 uses a 5.5 pound hammer.A STM D698 uses mould having diameter of 4 inch.

11. False, ASTM D1557 uses a 10 pound hammer and it falls through 18 inches.

12. Answer is 25 blows. In liquis limit test water content that leads to closure of standard channel in a soil sample uses 25 blows.

13. The moisture or water content of a soil is the percentage by weight of water present in the porous structure or voids of a soil. Answer is "d"

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