CMP 305 Exam Questions and Answers
100% Correct | Graded A+
all shapes of soils - angular
subangular
rounded
why do angular particles have better engineering properties - less voids
Clay particle properties - very fine and layered flat
attracts water the most
charges for clay - mineral surf...
why do angular particles have better engineering properties - ✔✔less voids
Clay particle properties - ✔✔very fine and layered flat
attracts water the most
charges for clay - ✔✔mineral surface negative charge
edges have positive charge
sieves are used for what kind of soil - ✔✔coarse grained
what do classification tests determine - ✔✔direct physical sizing of material
and sedimentaion
sedimentation - ✔✔process of settling
well graded - ✔✔wide range of sizes
poorly graded - ✔✔small range of sizes
,what kind of soil is most suseptible to soil liquefaction - ✔✔poorly graded
soil liquefaction - ✔✔strength and stiffness reduced by high loads or
vibrations
fine grained based on sieve - ✔✔more than 50% passes through 200#
seive
Dry strength test - ✔✔Mold sample into ball and let dry, break ball with
thumb and finger
dry strength test if ball doesnt break - ✔✔highly plastic
dry strength test if ball breaks - ✔✔not very plastic
plasticity index depends on what - ✔✔amount of clay present
plastic index indication - ✔✔fitness of the soil and its capacity to change
shape without altering volume
Clay properties vary in proportion to - ✔✔water content
high water content in clay has ___________ Properties - ✔✔liquid
Low water content and volume decrease in clay shows that it is - ✔✔plastic
Atterberg limits evaluate - ✔✔plasticity
atterberg limits used when - ✔✔for dams, embankments,landfills,highways
atterberg limits determine - ✔✔if building can be supported
, Liquid Limit - ✔✔soil water content expressed in % of dry unit weight
Liquid limit point - ✔✔which soil will start to flow using the shake test ( more
water content)
Plastic limit - ✔✔moisture content % at soil begins to crumble ( less water
content)
Plastic index - ✔✔numericle difference between liquid and plastic limits
plastic index represent - ✔✔range in moisture content
In field devices - ✔✔soil density devices
pocket penetrometer
turvane
pocket penetrometer measures - ✔✔tons per square foot
in place density or in place unit weight refers to what - ✔✔volumetric weight
of soil in undisturbed condition or compacted fill in pounds per square foot
IPD or IPUW only used for - ✔✔coarse grained soils due to there being
such a difference in bank and compacted density and volume
The greater the density or unit weight the better the... - ✔✔shear strength
and less tendancy for compression
borrow pit soils - ✔✔an area to remove earth soils which will be used for fill
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